Registered No __ _

ELECTRICITY GENERATING AUTHORllY OF THAILAND

GRID CODE

1994 Solicitation

ELECTRICITY GENERA'l'ING AUTHORITY OF THAILAND GRID CODE

CONTENTS

PF Preface

GO Glossary and Definitions

PP Planning Procedure

CC Connection Conditions

OP Operat ing Procedures: OPl Demand Forecasting OP2 Maintenance Scheduling OP) Operational Planning OP4 Operating Margin OPS Monitor i ng and Testing OP6 Operational Liaison OP7 Safety Liaison OPS Contingency Planning

sop Scheduling and Dispatch Procedures:

00

SOPl Generation Scheduling SOP2 Generation Dispatch SOP) Frequency and Voltage Control

General Gel 002

Conditions: General provisions Grid Code Review

PF - PREPACE

PP.l

PF.1.1

PF. 1.2

PP.2

PF.2.1

PF.2.1.1

PF.2.1.2

PF . 2.1.l

PF.2.1.4

INTRODUCTION

The full benefit~ of interconnect ion of individual Pover Planta with centres of Demand, via a High volta ga Tranamission syst .. , Can only he realised fully if the System is subject to a certain level of central control. In particular, (1), the development and maintenance of both the Transmission System and the Power Plants must be co-ordinated and (2), the powe r Plant. must be subj e ct to Cantral, Karit order, Di.patch. The electricity Syst-= in Thailand has been operated by EGAT in accordance with these principles by means of int ernal Procedures .

The introduction of Power Plants , owned and operated by Independent Power Producers (IPPs), on the System requires that these internal Proceduras are published and that comp liance with these procedura. i s .andatory for both EGAT and IPPs. This Grid Coda represents the published version of these Procadures.

THE GRID CODII CONTEJf'l'S

The Grid coda consists of the following main sections:

Glossary and Definitions

A list of technical terms used in t he individual Proce dures, with their definitions .

Technical and design criteria and Procedure. to be f ollowed in the p lanning of developDents to the Trans.ission Syst.m, including information to be provided by Ganeratora.

Co~ootion Conditions

procedure covering :

(a) the technical r equirements which must be met by a Generator before connection to the Trans.isaion system is allowed ; and

(b) the procedure to be followed by EGAT and a Generator in seeking permission for co~sction.

operating procedures

PF' - 1

PF !continued)

PF.2.1.5

PF.2.1.6

A series of proeeduras covering the operation ot the Transmission Syatem, External Intarconnactora and Ganeration, including:

(a) preparation Of Demand Foraeasta, Sohedu1ing and Diapatch timesca1es;

(b) planning of Transmi.sion, External Interconnaetor and Generation Maintenance Outages; and

(c) operational liaison, covering, safety, communications and EVent and Incident reporting _

sohedul ing and Dispatch Proceduraa

A series of Procedures covering the Scheduling and Dispatch of Ganerating Units, including:

(a) daily submission, by Generatora, of information on Capaoity available and Operating characteriatics of their Dnits;

(a) daily submission, by Externally Interconnected Partiee, of information on Capacity availabl. and r.ports and Exports expected across their External I nterconnactora;

(e) preparation Of the naily aeneration Program; and

(d) DispatCh of Generating Units.

General conditions

The Ganeral conditions part of tho arid code is designed to achieve three ends:

(a) A section covering general communications between EGAT, £Eternally Interconnected Partie. and the aenerators;

(b) the rules covering nunforseen circumstances" ;

(c) the rules covering the granting ot derogations to the Gri~ CodB; and

(d) the rules controlling modifications to, and issue of, the Grid Code.

PF - 2

• GO - GLOSSARY AND DEFINITIONS

GD . 1

GD.l.1

GD.2

GO.2.1

GD.3

GO.3.1

GD . 3.2

GD.3.2

GD.3.4

INTRODUCTION

The Glo,ea~ and Definitions GD is intended to:

(a) define the rules for the construction of references and matters ot general interpretation Of the Grid Code; and

{h) provide a list of Dafined Taraa and the meaning that thay take in the context of the Grid Coda.

OBJECTIVB

The objective of GO is t o reduce the chance of the provis ions of t he Grid Coda be ing misunderstood .

GEN&RAL INTERPRETATION OP THE GRID CODE

The table of contents, the preface and any headings are inserted for convenience and Shall be ignored in construing the Grid Code.

Unlass the context otherwise requires, all references to a part icular paragraph, sub­paragraph, Appendix or SChedule Shall be a reference to that paragraph, sub-paragraph, Appendix or Schedule in or to that part of the Grid Code in Which the reference is made.

Unless the context otherwise requires, all referencas to BGAT are to EGAT:

{a) in its rol e as owner and operator of the Transmission System; and

{b) 1n its role as overall co-ordinator of the Trans.ission System and the Pover Plants and EKternal Interconnectors connected to this 8y~ta., including its role of central scheduling and Oispatch of Generation and Importa and E~orts across External Interconnectors.

Unless the context otherwise requires, the singular shall inclUde the plural and vice versa, references to gander shall include ell other ganders and any references to persons shall inClude any individual, body corporate, corporation, joint venture, trust, unincorporated association, organisation, firm,

GO - 1

GO (continued)

GO.3.S

GO.3.6

GD.3.7

GO. 3 .B

GD.3.9

GD.3.10

partnership and any other entity, in each case whether or not having a separate legal personality.

Reference to "in writing" or "written" inClude typewriting, printing, l i thography, facsimile and other ways of reproducing words in a legible e nd non- transitory way and, where this has been agreed by EGAT, messages sent vie a computer to computer data link.

Where the alos,ary and Definitions refers to any word or terril which is more particularly defined 1n a part of the arid cOde, in the event of any inconsistency the definition in that part of the arid Code will prevail over the definition in the Glossa ry a nd De finitions .

Where there is • reference to an item of data being expressed as a whole number, f ractions below 0 .5 shall be rounded down and fractions of 0.5 or above shall be rounded up.

"11 cOlUlunications between EGAT and the Generators or any other Usars shall be in the Thai language unless otherwise agreed, in writing, by EGAT.

All references to time are to Bangkok time and shall be given in the 24 hour clock notation, given as 2 digits (giving the hours, trom 00 to 24), 2 digits (giving the minutes (rom 00 to 59) and the term "hoursM.

The tol10wing standard multiples will be used in expressing the values of energy (when expressed in .att hour s or JOulel), power (when exprossed in .atts or Volt ~perea) and Voltaga.

Mllltjple SymboJ VI!) lle

kilo • 1,000

Mega • 1,000,000

Giga 0 1,000,000,000

Tera T 1,000,000,000,000

GD - 2

•

GD (continued)

GD.4

GO.4.1

GLOSSARY AND DEPrHITIOHS

In the Grid coda the following words and expressions (which in the Grid Code are shown emboldened) shall, unless the subject matter or context requires otherwise, bear the following meanings:

Active paver. The product of voltage and the in­phase component of alternating current, measured in Watts and standard mUltiples thereof.

APC. Automatic Frequency Control is part of AGC function where frequency regulation is performed.

AGC. Automatic ~eneration ~ontrol, being a computerised technique based at the EOAT control centre which automatically enables prequenoy regUlation and the optimization of overall generation costs by sending the signal to adjust the set-point adjustment of a Generating Unit's governor(s) .

Al ternator. A device in which a group of conductors is rotated in a magnetic field for the primary purpose of generating alternating current electricity.

ANSI . American National Standards Institute Incorporated

Apparatus. Plant or equipment connected to, or forming part of, the syst .. and which is required for the production, control or Measurement of electricity supplied to or through the System.

Authorised Operato~. Any person that is authorised under (Act or Statute) to Generate, transmit or supply elect r icit y.

Automatic aene r ation Control . See AGC.

Auto.atie aeneration 6heddi nq. A computerised system which sends out signal to trip off selected generation units a ccording to predefined circumstances.

Auto.atic Vol taqe Regul ation. See AVR.

Availabil ity . A measure of the capacity made

GO - 3

I

GD (continuad)

available. tor a Generating- unit within a particular period of timB and calculatod as MW of capaoity, multiplied by the time in hours over which it is availablll. Given in KWb.

Availability Daclaration. A statement ot expected AVailabi l ity, made by a Genarator in re.spect of one of its oanerat ing Units, pursuant to Sohedulinq end Oiapatch Procedure SOPI, paragraphs (SDP1.) . ), SDP1.4.) or SDPl.5.l).

AVR. Automatic Xoltage Requlation, being the continuously-acting automatic excitation control of the Alternator of a Generating Unit which controls the Generating Dnit terminal voltage.

Blaok start. A Generating Dnit Start-Up Which is accomplished without any iuports ot Power to the Power Plant within Which the Generating Dnit is located.

Black start Capability. The capability of a poyer Plant to perform Black starts.

Block Load on Synchroni.ation. output level which a Generating synchronisation.

The instantaneous unit will attain on

Su.inesa Day. Any day, which i s not a Saturday or Sunday, during which the banks are open for normal business in Bangkok.

Capacity. The achievable power output of a Generating u n it, given in MW, and net ot any power used solely to drive Apparatus dedicated to this particular Generating unit and any power output achievable as HaxiMua Generation.

Central Dispatch. The process ot Scheduling Generation and ;~~uinq dircot Xna t ructlona to a Generator or othe r Authorised Operator.

Certiticate at Raadinesa. A written confirmation, issued by EGAT to a Ganerator, that a Connection Point has been accepted by ~GAT as ready for energislltion.

Connoction Point. The point at which EGAT's Syst~ and a U.er ' . System are connected.

GO - 4

GO (continue4)

connection Conditions or CC. The part of the Grid Code identifiod as tha Connection Condit i ons .

contingency Reserve. Reserve Capacity Which clln be called on to operate within a period of not more than 24 hours.

Control Telephony. Telephone system, installed primarily f or system control purposes and linking the Users and EGAT.

correction Factor . Heat Rate or water actual values.

A fraction used Rate from design

for adjusting values to

Daily Generation Proqra.. The daily SChedUle of Ganeration expected t o be Dispatcbed produc ed pursuant to scbeduling and Dispatch Procedure SOPl.

Daily Maintenance Schedule. The schedule showing the expected Generating Unit, Power Plant, EXternal Interoonnector and Transmission System Outages covering a single 24 hour period.

Day Paak. The value of the highest System Demand in the period B.OO hours t o 18.00 hours in a particular day.

Declaration. A state ment of the expected Availability, values of Operating Characteristics or any other factors made by a Generator in respec t of one ot its Generating Units, pursuant to Scheduling and Dispatch Procedure SDP1, paragraphs (SDP1.].], SDP1.4.J or SDP1.5.1).

Defined Tera. A term defined in this Glossary and Definitions, GO.

De-Loading Rate. The rate at which a synchronised Generatin9 unit can reduce out put under operator control "'-nd 1n normal operating conditions.

D .. and. The quantity of Activa and Reactive Power which it is expected that all customers will require or which they actually require.

D .. and Porecast. A statement of the ~orecast Demand and pattern of Osmand which it is expected that all customers will require.

GO - 5

GO {eontinusdl

Dependable Contracted Capacity. The maximum continuous capacity in MW for a Generating unit tor supply to EGAT which has been tested according to Schedule 14 ot PPA and agreed upon by EGAT.

Da- Synchronisa. The act of shutting down a Synchronised aenerating unit and temporarily disconne cting it tram the Transmission Systam.

Oatailed Planning Data. Intormation and data in respect at a Powar Plant, ~edded power Plant or Generating Unit whiCh is provided to BGA~ tor long t erm s ystem planning purposes under Planning Procedure PP.

Direct Customer. A customer who purchases electricity directly (rom EGAT.

Dispatcb. The act ot issuing Instructions to Generatora.

Dispatch Instruction . See Instruction.

Earthing. connection earth.

The provi sion of an betWeen One or more

electrical conductors and

Earthing Device. A device whiCh is designed to provide Earthing.

Econoaic Operating Characteristics. Operating Characteristics which provide information on the economics ot opera t ion of a Generating Unit ot the cost or price of Imports over an EKternal Interconnector.

EOC. Economic Despatch Control is part of AGC function where load sharing among various generation units which are on AGC is performed to achieve the opti~al production cost takinq Incremental Transmission Loss into account.

EGA~. The Electricity Generating Authority of ~ailand .

BOAT Contro l Centre. EOAT's National Control centre or r egional control centres set up for the purposes of Scheduling and Dispatch of Generating Onits, EKternal Interconnactors and Transmission Syst e. control and switching.

GO - 6

•

GO (continued)

eOA~ Control Enqineer. An EOAT officer authorised to Dispatch Generatinq units and to issue Transmiss ion syst .. switchinq instructions.

EGATCC. The EGAT Control Centre.

EGAT'. syst... The combi nat ion of Apparatu. operated by EGA~ and which forms part of the Syatem.

Embedded Poyer Pl ant. electricity to BOAT'. to a USlr'e System.

A Power Plant which provides Systam but which is connected

Eveninq Peak. The value of the hiqhest System Demand in the periOd 18.00 hours to 21 . 00 hours in a particular day.

EXport. A flow of electricity from the system to an Exte rnal System via an External Znterconnlctor.

&sternal Interconnected Party. A Party , other than EOAT, who, either solely or jointly with EOAT, has cont rol of an EXternal Interconnector .

External Interconnected Party Control Centre. Control c e ntre, operated by an Bxternal Interconnected Party, Which is used for the control of an External Interconnector.

EXterna l Znterconnected Party Control Enqineer. An Extern.l Znterconnected party off icer authorised to control an &sternal Znterconneotor.

External Interconne ctor. between the System and an

An Interconnection EXternal System .

External Pover Plant. A Poyer Plant which supplies electricity to the Syste. via an External ZntercoDnector.

EXternal Sys tem. An electricity system located outside of the borders of Thailand.

Field current. The current flowinq throuqh the f ield coil o f the stator o f an Alternator.

Final Maintenance Schedule. The schedule showing the expected maintenance outages which is produced by EGAT at the end of the consultation process

GO - 7

I •

GO (continued)

detined in OP2.4.

Fiscal Yea~. The period starting at 0000 hours on 1 October in a year and tinishing at 2400 hours on the 30 september in the next following year.

Forecast Demand. The level ot Demand that it is expected will have to be met.

Pr •• Governor Action. The operation ot a aenerat ing Unit where the level ot output is controlled by an automatic governor.

prequency. cycles per (expressed

The number ot alternating current second at whiCh the System is running in a,).

General Conditions or ac. That part ot the Grid Code identitied as the General conditions.

Oeneral Conditions 1 or Gel. That part ot the Gene~al Conditions identitied as General Provisions.

General Conditions 2 or GC2. That part of the Gene~.l Conditions ident itied as Grid Code Review.

Gene~.ting unit. A combination ot Prime Mover and Alternator (and such other apparatus as is uniquely identitied with this machinery) which generates alternating current electricity and which is subject to Central Diepatcb.

Generation. The production at, or the facilities required to produce, electricity.

Generation ~ran.toraer. A transtormer, toraing part at a Generating onit, Whose primary purpose is to transform the voltage at the alternator output terminals to the required voltage at the poJnt on the By.te. to vhi~h the Oanerating Unit supplies electricity.

Generato~. A person which is registered with EG~T as being the owner or, as the case may be, the operator of a Power Plant or, in respect of Planning Proce4ure PP, a proposed Paver Plant.

aenarator Sbe44inq The reduction in Generation

GD - 8

,

GD (continued)

brough ~bout by tbe controlled disconnection of the generator.

OJ. Oiqa Joulee. £qu~l to 1,000,000,000 Joules.

Glossary and Definition. or GO. The part of thG Grid Code identified as the Glossary and Definitions.

Grid Code. This collection of Procedures and other documents, known as the Gr id Code, prepared and issued by BOAT, as from time to time revised and re-issued.

aeat aate. The amount of energy used by a Ganerating Un i t te perform ~ single unit ot a part icula r ser vice. Fo r instance, one hour of running ~t zero load (given in GJ/hour), the production of lKWh of output at a partioular output level (given in GJ/KWh) , or to perform one start-Up (given in GJ/Start-Op).

Raat Rate Curva. A curve showing, for a particular Generating Onit, the thermal energy consumption per hour of operat ion at various output levels (given in OJ/hour) .

High Frequancy EMergency. A Systam Eaergancy which has caused syst .. Fraquency to rise above 50.5 Xe.

High voltage. Voltage of 69 IV ~nd above.

Hot Standby. The condition Of the boiler of a aenerating Unit Where the steam is held at normal operating temperature and pressure but the turbine at the Gener ating Unit is not synchronised.

Hydro. Pertaining to the Generation of electricity through water power.

Hydro Merit Order. A Merit Order ot only Hyaro Power Plants. Based on down stream requirements and hydrological conditions.

Hydro Power Plant. A Power Plant whose main source of energy input for electricity Generation is water power.

GD - 9

IEEE.

"

Hz. Hertz. A Measure of Frequency, where 1 Ha _ 1 cycle/second.

lEe. International Electro-technical Institute of Electrical ~nd Electronic

committee Engineer.

Import. A flow of electricity to the System from an Esternal SYBt.m via an External Int.roann.cter.

Incident. An unplanned occurrence on, or related to, the System which has caused, or could have caused, a breach of the Operating standard. or has caused injury to an individual.

Incremental Transmission Loss. transmission loss to the change part icu l a r uni t .

The change in in generation 0'

Independent Power Producer. EG~T does not have a majority

A Generator in which equity interest.

Instruct. The action of EOAT issuing an In.truction to a Generator concerning some action to be performed by a Generating unit operated by that Generator.

Inatruetion. An instruction issued by EGAT in respect of a Generating Unit or ~tarnal Interconnector to achieve, as the case may be, a certain Active Power, Reactive Power {or target voltaqe levell or RS$erve Capacity level by a specified ti~e.

ISO. International Standard Organi2ation.

Isolation. The electrical separation of Apparatus from the system.

Isolation Oaviee. A device designed to provide ISOlation of Apparatus from the system.

ITL. Incremantal Transmi.sion Loas is the chango in transmission loss to the change in generation of a particular unit.

Joule. A measure of energy equivalent to 1 Watt ot power delivered for 1 second .

Load Pactor. The output of a Power Plant or Ganeratinq Unit divided by the output Which it

GO - 10

,

GO (continued)

would have achieved had it been operated at its tull Avai l ability over the same period.

Load Foreeaat tor the ~hailand eleotrio System. The Demand Foreeaat prepared and issued by the Thailand Load Forecast sub-committee.

Load Sbe4dinq. The reduction in Syate. Demand brought about by the controlled disconnection of custom"-rs.

Load Shedding Block. will be treated as a purposes.

A l"Iumber ot customers who group for LOad Shedding

Loading Rate. The rate at which a synchronised Generating unit can il"lcrease output under operator control and in normal operating conditions.

Local Batety Procedur.s. The safety procedures i mplemented by BOAT or a Usar to cover work carried out 01"1 their side at a conneotion Point.

Los.... Electrical energy lost in the Transmission Sy.tea.

Low Frequency Emergency. A System Emergency which has caused System Frequency to fa ll below 49.5 H~.

LOW Frequency Relay. An automatic relay, which can detect syatam Fraquency and is set to operate whenever Systam Frequency falls below a certain preset value.

LoW Prequency Autosatic Loa~ Bhad~inq. Load Sbeddinq which is achieved by the operation ot a Low prequency Relay_

Maintananca outaqe. A period ot full or partial non-Avail~ility or a Power Plant, Gene~atinq Unit or part of the Trans.ission System during which it is pldnnea to carry out maintenance work.

Maintenance Scbe~ule. A SChedule p~oduced by EGAT pu~suant t o OP2 showing the times at which it is expected that Maintenance outages will take place.

Manual Load Bbe~dinq. achieved by the manual of a ci~cuit breake!;".

Load Shed~inq whiCh is initiation of the operat i on

GD - 11

I

•

GlO (continued)

Maximum Generati on. For a particular aeneratinq Unit, the level ot power output deliverabl e above the declared capacity which i s sustainable for only short periods of time.

MEA. The Metropolitan Electricity Authority.

Merit Order. A list ot Ganeratinq Units in a scending order ot Eargina1 actual or avoided operating cost t aking start-up and shutdown costs, Minimum Up-Time and Minimua DOvn-TiJlle, tuel constraints and other operating constraints into cons ideration (see also Thermal Merit order and Hydro Merit Order).

Minimum Down- Time. The mlnlmum time for which a Generating Unit must be De-Synchronised.

Minimum Genarati on. The mlninum output level which a Ganerating Unit can sately maintain for an indetinite period.

Minimum Up-Ti.a. The .ini~um time tor Which a Oenerating Unit must be Synchronised.

Monthly Operating Program. A statement prepared pursuant to OP) and covering one month, showing the expected Availability of Ganerating units and the way in which they will bQ Scbeduled to meet Foreeaat Dellland.

Mon thly Maintenance Scbedule. The schedule showi "9

the expected Generating unit, Power Pl.nt, ~tarnal 11Iterconnector and Transmisaion System Outages covering a single month.

National Control Center or NCC See EGAT Control Center

NEC. Natinnal Electr i c Cod.

NZHA. National Electrical Manufacturers Association

N-l Criteri.. The system must be maintained stable durinq and after the disturbance in the system resulting in the loss ot one generating unit or one circuit ot transmissi on lines, as well as no 1055 o f load is allowed.

GD - 12

GO (~onti~ued)

Nominal Byetam F~equa~cy . so H~.

Notice to Syncb~onise. The pe~iod o( time required between the notification to 8 Gene~.tor that it i s required to Bt&rt-Op a Generating onit and the ea~liest tiMe the Generating Unit can be Syn~hroni.ed.

operating Characteristics. The parameters which detine the ability ot a Ganerating unit to respond to Diepat~h Instruction •.

operating Margin. The c.pa~ity available in ope rational time scalee over and above that actually use d to produce electricity.

Operating P~ocadura. or OP. That part o( the Grid Code ident i fied a s the ope~atiD9 Proc edure s.

Oper ating Procedura 1 or C£1. That part or the operating Procedura. identified as Demand Forecasting.

Operatinq Procedura 2 or DEZ. That part of the operating Procedures identified as Maintenance Scheduling.

Operating Pro~edur. l or QE3. That part of the operating Proceduras identified as Operational Planning.

operating Pro~edur. 4 or~. That part of the operating Proceduras identified as operating Kargin.

Oparating Procedure 5 or~. That part of the operating P~ocedures identified as Testing and Monitoring.

Operatinq Procedure , or~. That part o f the operating Procedures identified as Oparationa1 Li.iaon .

operatinq Procedure 7 or QE2. That part of the Operat inq Procedures identified a s Safety Liaison.

operatinq Pro~edure 9 or OP8. That part of the operating Procedur es identified a8 contingancy P1anning.

Go-'J

I

I

_~_ I __ • •

GD (eontinued)

Operatinq Program. A statement prepared purauant to OPl or &DP1, showing the expected ~v.ilability of Generating Units and the way in which they will be Scheduled to meet porecast Demend.

Operating Reserve. The capacity available in operational time scales, over and above that actually used to produce electricity, which is schedUled to provide Re,erve capacity.

Operating Standarda. Those standards relating to System integrity, security and stability which have been adopted by BG~'1' tor use in the planning and operation of the system.

Operation. A scheduled or planned action relating to the operation of any part of the syst8lll.

operational Effect. An effect on the operation of any part of the Systa. which aay require BGAT or any other u.er to operate in a non-standard way in order to minimise the chance of the Operating stendarda being breaChed.

Out-of-Merit Operation. The Instructed operation of a Genarating Unit where the output t r om that aenerating Unit displaces soma or all of the output of an available aenerating Unit which is higher in the Merit Ordar (that is, has lower marginal operating costs).

outage. A period when a Power Plant, Generating unit or part of the Trans.ission SYlt8lll is fully or partly non-operational to allow for construction, maintenance or repair work.

outage proqraQ. A program showing the expected Outagas.

Panel. The Grid Coda Review Panel set up pursuant to General Condition Ge2.

Partial Sbutdown. The situation where a significant part (but not all) of the System has become de-energised and is shut down.

Party. A person who is bound by any of the provisions of the Grid Coda.

PEA. The Provincial Electricity Authority.

CD - 14

Paak Oaaand. The highest Oemand which it is e~pected customers will wish to have met.

Planned Operating Cha racte ristics . The expected Operating characteristics ot a Ganerating U.it as sUbmitted to EG~T pursuant to the Planning Procedura PP.

Planned outege The out~ge of the Generating Unit during the period outside the contr~cted available hours, the schedule of which has been provisionably proposed by the Generator and (inally a r ranged by EGAT.

Planning procedure or if. That part o( the Grid code identified as the Plannin9 Procedure.

Plant. Apparatus within a Paver Plant.

Plant Kargin. The difference between the total Dependable contracted capacity and the Peak Demand.

paver Davalopment Plan. The plan, produced by EGAT, which Shows the eKpected deVelopments on the Bystem which wi ll be required ove r the neKt 15 yeare.

powar Plant. An installation comprising one or more Ganerating Units which can reasonably be considered as forming a single installation for operational purposes.

power Purchase Agraemant. An agreement between EGAT (in its role as electricity purchaser) and a Ganerator in respect ot a single Powar Plant tor the Genaration and sa le ot alectricity by the Ga.arator to EGAT.

PPA. A Power Purchase Agreaaant.

Power 8yatam stab11i.er or PSS. A device connected to the generator to improve damping.

Pretace or pr. The Praface to the Grid Coda, which does not form part at the Grid Code.

prime Kover. provides the

An engine which is connected to, power to drive, an Altarnator.

GO - 15

."d

Procedures. The ..-ritten procedure and other documents (but excluding the contents page and the Preface) included in the Grid Code, of Which this Glo •• ary and Definitions, GD, is one.

Prudent Practice. The standard of practice attained by exercising that degree of skill, diligence, prudence and foresight Which could reasonably be expected from a skilled and experienced operator enqaqod 1n the same type Qf undertakinq under the same or similar circulIlstances.

PBS. Paver Sy.tem Stabilizer - a device CQnnected tQ the generator to improve darnpinq.

PTT. Petroleua Authority of Thailand.

Puaped storage Plant. A Hydro pover Plant Where water to the reservoir is, in the main, supplied by pumping water up to this reservQir frolll a lower reservoir.

ROC. Regional Control center .

Reactive Generation. available to produce

Generation capacity which is ReactiVe Power.

Reactive Pover. The product of Vol tage and the 90Q

out-of- phase component of alternating current, measured in volt Amperes reactive (VAr) and standard multiples thereat.

ReactiVe Re.erve. Reserve generation capacity which is available to produce Re.ctive Paver.

Ragistered Operatinq characteristics. The Operating Characteristics of a Generating unit as registered with £GAT pursuant to the Connection Conditions, cc,

Reliability. The state of readiness when needed.

aes.~e. Generation capacity which is availahle for use but which is not, at that moment, producing ActiVe Paver or Reactive Paver.

SCADA syst~. ·Supervisory £ontrol And Data Acquisition System". A system which gathers operational date (such as systaa Frequency.

GO - 16

GO (continued) , voltage, Load flows, breaker positions) and processes and displ<oYs it in the EGA.'l' control centre •.

sarety co-ordinator. The individual appointed by either EGAT or a User to co- ordinate serety matters across a Connection Point, including the preparation, application, approval and revision at Local Satety prooadures.

scheduling. The process ot compiling and issuing the Weekly operating Program and Daily Ganeration Proqraa.

scheduling and Dispatch Procedures or SOP. That part of the Grid Code identifiod as the Scheduling and Diepatch Procedures.

Schedu!inw and Dispatc:h Procedure 1 or 80P1. That part of the scheduling and Dispatch Prooedures identified <08 Generation Scheduling.

Scheduling and Dispatch Procedure 2 or 8DP2. That part of the scheduling and Dispatch Procedures identified as Generation Dispatch.

Scheduling and Dispatch Procedure J or SDPJ. That part of the Scheduling and Dispatch Proceduree identified <0$ Pre~uency and Voltage control.

ShutdOVD. The act of shutting down a Synchronieed Generating unit and disconnecting it from the 7r~s.ission Syst ...

signlricant Incident. An Incident Which in EGAT'e raas.onable opinion has caused, or could have caused, a System Baergeney or serious injury to an individual.

Single Line Diagran. A schemat i c representation of an electricity syetem prepared i n accordance with normal ele~trlcal engineering practice and which is generally known as a single line diagralII.

Site Responsibility schedule. A SChedule prepared by EGAT showing the ownership and operating and safety responsibilities in respect of a site.

spinning Reserve. That Capacity on Synchroni.ed Generat i ng Units wtlich is not providing output but

GO - 17

GD (continued)

~hich is realisable in Dispatch timescales.

standard Time. The time which ~ould be registered by a clock ~hosa ~ccuracy is independant of system Frequency. Thus, tho difference bat~een System T~e and Stand.rd Tiae is directly related to the cumulative difference between actual System Frequency and nominal System Frequancy, 50 H~ (see also System Time).

standard Planning Data. Informat ion and data in respect of a Power Plant, ~edded Paver Plant or Generating Unit Which is provided to EGAT for long term system planning purposes under Planning proc.dur. PP.

standing xnstruction. Instruction or prescribed procedure requires to operate the system during normal and adverse conditions.

start-Up. The action of taking a Genarating Unit from Shutdown to being Syncbronisad to the Sy.tem.

station Sarvices. The services within a Paver Plant which are necessary to allow electricity to be Generated and which consume electricity.

Synchronise. The action of carrying out the connection of a Genarating unit to the system such that the Prequency and phase relationship of the Ganerating Dnit and the By_tam are identical.

Systa.. The co~bination of EGAT'a System and all Uaer'. Systems, being the Transmis s ion system, connected Power Plants and the EXtarnal xnt.rconnacto~s.

systae D-=and. The actual or forecast Demand on the system.

systae E=erqency. A situation where the integ~ity. aatQty or stability o[ all or part of the System is threatened.

system Emergancy Aotion Shaat. Tha written procedure, not being part of the Grid Coda, issued by EGAT tn Authorised operator, which defines the actions to be t aken during an actual or potential systa. Emergency.

GD - 1 8

GO Icontinued)

sy.tom Fr~ency. The actual Frequeney of the Syatell..

syat .. ~ime . The ti.e which would be registered by a clock whose accu~acy is di~ectly ~eleted to Syet.. Frequaney. Thus, the difference between syetem Time and Stenderd T1=e is directly related to the cumulative difference between actual system Vrequency and Nominal Sy.te. Frequeney, 50Hz (see also Standard Tae) .

syat .. Voltage. The Voltage at which the relevant part or parts of the System is operating.

Target Frequency. Tho target for Syst .. Vrequency, as set from time to time by EGAT.

Target Time. The time by which the carrying out of a Dispeteh Instruction must be completed.

Therm.l. Pertaining to the Generation of electricity through the use of heat.

Thermal Merit Order. A Herit Order of only Thermal power Plents.

Thermal Power Plant. A Power Plant whose main source of energy for electricity Generation is heat.

Three Year Operating PrograJI. A statement pt'epat'ed put'suent to OP2 and covering three years, showing the expected Availability of Generating Vnits and the way in which they will be Scheduled to meet Foreca.t Demand.

Total Shutdown. A situation where the By.tOG has been totally dc-energised.

Tren9~is.ion system. The High Voltage electricity network operated by EGA-T.

TransGisaioD MaintenaDce Schedule. The schedule showinq the expected Outages at the Transmission system.

Turbine Head. The distance, in netre9, between the mean surface level of water above the inlet to a turbine of a Hydro Povu, Plant and tho horizontal centre line of the turbine.

GO - 19

GO (continued)

Onder Frequency Automatic Load Sheddinq. Load Shedding which is achieved by the operation or a Under prequency Relay.

Undar prequenc:y Baergency. A Syetem Baergency which has caused Syetem Frequency to tall below 49.5 Hz.

Under Prequency Relay. An automatic relay, which can detect system Frequency and is set to operate whenever Syatem FrequeDcy ta1ls below a certain pre-set va lue .

Unscheduled SreakdoVD. The unexpected failure of a Generating Unit, Bxternal lnterconnector or part of the Tranellliasion Syatea.

User. Any person, other than BGAT, making use ot the Trensaiaaion syetam.

Veer '. S1st... The combination ot Apparatus operated by a v.er and which rorms part ot the syst ...

V. Volts

VA. Volt Amperes.

VAr. Volt Amperes reactive, a measure of Reactive Power.

Voltage. The measure of electrical potential between two connected points of the System.

Volta. A meas ure of Voltage.

Volt Amperee. The product of the maximum Voltage and maximum current, irrespective of phase angle.

.... ...att.

"'armth Condition. The heat condition of a Thermal aenerating' Unit, expressed as ftHot", Warm" or Co-ld", related to the time since it was last Synchronised.

Warmth varying Operating' Characteristics. The Operatinq Characteristics of a Thermal Generating unit, the value of which varies with the War.th Condition of the Generating Unit.

GO - 20

GD (continua~J

.ata~ Rata . The amount of water (ml /sec.) used by a hydro generating unit generation a single unit at particular output.

Watt. A measure of electrical power equal to the in-phase product of 1 Volt and 1 Ampere.

Watt hour . product of (in hours)

A measure of energy, calculated as the the Aetiv. Power (in Watts) and the time ror which it is produced.

Weekly opsratinq Program. A statement prepared pursuant to SDPl and covering one week, showing the expected Availability of Genarating unit~ and the way in which they will be schaduled to meet Foracast De .. n~.

Weekly Ma intananoe Sche~ula. The schedule showing the expected Genarating unit, Power Plant, ~xtarnal Intarconnector and Transmiseion Syetam Outaqas covering a single week.

Whr. Watt hour •.

Yearly Operatinq Program. A statement prepared pursuant to OP3 and covering one year, showing the expected Availabil i ty of Genarating Units and the way in which they will be Scheduled to meet Foracast Demand.

GD - 21

PP - PLANNING PROCEDURE

PP.I

PP.1.1

PP . 1.2

PP.1.3

PP . 2. 1

PP.l

PP.l.I

INTRODUCTION

Planninq Procedura PP lays do .... n the procedurQs to be adopted to ensure that BGAT obtains the in(o~ation required tram Generator$ to plan the future developments ot the Syatam.

In respect of this PP it is assu~ed that any planning data .... ith r ete rence to p r oposed Ezterna1 Intareonnactora .... il1 be obtained by EGAT using procedures .... h ich are out side of this PP.

The Ganarator shall inform BOAT .... ithout delay ot IIny actual o r IInticipated changes to any ot the into~lItion supplied u nde r PP .3.

OBJECTI VE

The objective o f this PP i s to ensure that Generators provide EGAT .... ith timely and accurate data and intormation to allo .... BGAT to plan the future development of the System.

PROVISION OF OATA AND INFORMATION

PralL.inary data and intormation

A Oanarator shall provide to EGAT, in writing, the Standard Planning Oata list ed i n Appendix 1 to this PP in respect o f any proposed Po wer Plant or, as the case may be, proposed Generating Unit .... ithin an existing Povar Plant:

(a) at the tias it has been agr eed, in principle, with EGAT (ac ting in i ts role. of e le.ctricity purchaser) that the proposed Power Plant or Generating Unit will be constructed and operate d against a Power Purcbase Aqreelllent or "PPA" entered into bet .... e en t he Generator and EG~T , but before ;;uch ag:r- .. elllcnt is "iqne<J; or

(b) f or a proposed Paver Plant or Ganerating unit Which will not opera te under a PPA with SGAT:

(i) at the t ime an appl ication is made to EGAT to allo .... the proposed Power Plant or Generating Unit to be connected t o EGAT's System but

PP - 1

PP (continued)

PP.3 . 2

where no such agreement has been reached; or

(ii) at the tiMe an application is made to a User to allow the proposed Power Plant or Generating Unit to be connected to the user'. syat .. (where the Power Plant concerned will be referred to as an Eabedded Powar Plant) but where no such agreement has been reached.

A Ganerator shall provido to EGA~, in writing, tha standard Planning Data and the Detailed Planning Data listed in Appendix 1 co this PP i n respect ot any proposed power Plant or, as the case may be, proposed Genaratin9 Unit within an existing Power Plant:

(a) at the time a Power Purcbase Agreemant (in respect of the proposed powar Plant or Generating Unit) has been concluded with EOAT (acting in its role of electricity purchaser) but before such powar Plant or Ganerating Unit has been declared as ready to commence commissioning; or

(b) for a proposed Power Plant or Ganarating unit which will not operat e under a PPA with BOAT:

(i) at the time an agreement has been reached with EOAT to allow the proposed power Plant or aanerating Unit to be connected to EGA~ ' s System but before such power Plant or Ganeratinq Unit has been declared as ready to commenca com~issioninq; or

(i1) at the time an agreement has bean reached with a Ussr to allow the proposed power Plant or Generatinq Unit to be connected to the Usar ' a Syste= (where the Powar Plant concerned will be raferred to as an Embeddad Powar Plant) but before such power Plant or Generatinq unit

PP - 2

PP (continued)

PP.l.l

has been declared as ready to comme nce commissioning.

Connected Dota and InformotioD

A Generotor shall provide to EGAT, in writing, the stondord Plonning Dato and the Detoiled Planning Data listed in Append ix 1 ~o th i s PP in respect of any Paver Plant or, as the case may be, Generating Unit within an existing power Plant for which such information has been submitted under PP.J.l and PP.l.2 but has not previously been submitted under thi s PP.l.J a t a time Which is no less then 10 working days betore the tirst day on which the r e levant connection Point is energised by means of the aenerating Unit produoing electricity.

pp - )

PI' - APPENDIX 1

1'1'''1.1

ppA1.2

INTROOUCTION

Each Generator will submit the inrormation detailed below in accordance with the provisions ot this Pl'.

STANDARD PLANNING DATA

The toll owing Standard Planning Data s hall bo SUbmitted according to the requirements ot this PI':

(a) name of the person making this SUbmission; [SGAT to provide nama, address, telephone nuntber. )

(b) name or the Power Plant to which these data reter;

(c) location o f the Power Plant to which these data refer; ( EGAT to provide map.)

(d) type ot Power Plant and technology proposed, including:

(1) Thermal, Hydro, pumped storage, wind, other;

(ii) it Tharmal, then open cycle gas turbine, combined cycle gas turbine, steam turbine, reciprocating engine, emission control technology. source ot cooling water, cooling water requir ement s as m' jhour at full load ;

( ii i ) Black s tart capabi lity of pover Plant

(e) identification of each Generating Onit to which these data refer;

(t) for each Genarating On it identified under Pl'A1.2 (d):

(1)

( ii)

( iii)

(tv)

rated KVA and MWi

short circuit ratio;

inertia constant (HWseconds/KVA);

aenerating unit step- up transformer

PP"l - 1

PP - APPENDIX 1 (continued)

PPAl.3

(v)

( vi)

(vii)

KVA rating, reactance and tap details;

expected date for start of cOllllllissioning;

expected fuels to be used;

model of machine and parameters;

(viii) incremental Heat aate/Watar Rate and Correction to adjust overall efficiency from time to time .

( iix) Black start capability details.

DETAILED PLANNING DATA

The following Detai1ed Planning Dat. shall be submitted according to the requirements of this PP:

Ca) na~e o f the person making this submission;

(b) name of the Power Plant to which these data refer,

ee) identification of each Generating Unit to which these data refer,

(d) for each Generating- Onit ident ified under PPAl.l (c) giving values of the expected Operating Cbaraeteristics other than the Economic Operating Cheracteristics (a8 given in SDPlAl) which shall, tor the purpose at this SUbmission, be classed as the Plartned Operating Cbaraoteristics;

Ce) information on the Generation and station Transto:r-.ars;

(f) details ot all protection equipment and settings;

(g) 8in91e Line Di a9ralll ot the power Plant;

PPAl - 2

(

pp - ~PPENDtx 1 (continued)

(h) A diaqra~ ill~strating protective device. to prevent short circuits, overcurrent, undervoltaqe or ovcrvoltaga, under trequency or over frequency, out-ot-phase reclosinq, and distribution of electricity to EO~T" sy.t •• when there is no current in the interconnecting line;

(h) Confirmation that the power Plant can fOrDS in all res pects with the t echnical standards laid down in the Connection Conditione, CC.

PPAl - 3

='. CC - CONNECTION CONDITIONS

CC.1

CC.1

CC.2

ce.2.1

CC.3

ce.3.1

INTRODUCTION

The Connection Conditions CC specifies the minimum technical requirements to be met by a Gen.~ato~, in respect of its Generating Units, wishing to connect to the 8yste~ and the procedu~e to be followed to ensure compliance with these conditions.

OBJECTIVE

The objective of thi~ CC is to ensure that:

(a) the technical and operational conditions which must be met by a aenerat or for connection to the System are clea~ly stated; and

(b) Power Plant and aenerating Unite are only connected to the System if the technical and operational conditions, laid down in this CC, are met.

BOAT ' S SYSTEM PERFORMANCE CHARACTERISTICS

BGAT will ensure that, subject to the provisions Of eC.3.2, the conditions on BGAT ' S System, if energised, at the point where it forms a connection point with a ueer' . system, will comply with the following operational criteria:

(a) system P~.quency shall be nominally 50Hz end wil l not no~ally be less than 49.5Hz or more t han 50 . 5NZ (although in exceptional circumstances it could fall to 47Hz or r ise to 528s);

(b) System Voltag_ will normally be maintained within ±5\ of the noftinal Syst .. Voltage (although in exceptional circumstances may be betw~en +/-lU' or nominal voltage);

(c) the ~aximu~ total levels ot ha~onic distortion on EGAT ' s system under normal o perating conditions and under both planned and unplanned Outage conditions (other than for infrequent short duration peaks) shall be:

cc - 1

cc (continued)

Voltage

CC. J .2

CC.4

CC.4.1

CC.4.2

CC.4.2.1

CC .4.2. 2

Level (RV) Total Distortion Individual Distortion

" U5

000 'VEN

" " " 1. 5' " 0 . 5'

(d) under normal operation and planned Outaqe conditions, the Daximum negative phase sequence conponent o f the phase voltage on BOJ.T'. 8yst •• sh ... ll not exceed l' other than for infrequent short duration peaks with a lIaxiro.um value of 2' .

The exceptional circumst ances referr ed to in CC.J .l will relieve EGAT ot the obligation to comply with the sy.tea conditions referenced therein. Such exceptional circumstances may occur in the event of there being insufficient active and/or reactive power capacity av".ilable on the 5ystelll or where an rncidant has taken place which, other than solely on the grounds of injury to an individual, could be classed as a Siqnificant Incident.

REQUIREMENTS RELATIHG TO GENERATOR'S APPARATUS

Generator's Apparatus (that is plant or equipment, owned and/or operated by a Generator, which forms part of a Powar Plant and is connected to the Sy.ta. and which is required for the production, control or measurement of electricity supplied to or through the System) shall in all respect s comply with the requirements l~id down in this CC.4 .

General Requirements

All Apparatus will be designed and constructed and at all tillles .ainta ined and operated in accordance with prudent Practice a nd ~hould be ~apdble ot operating under the Systl>ll\ conditions defined in CC.3.l.

Notwithstanding the requirements in CC.4.2.1, all Appar atus shall comply with the requirem~nts and/or standards as are specified in Schedule 1 .

CC - 2

CC (continua")

CC.4.2.J

CC.4.2.4

CC.4.]

CC.4.3.l

CC.4.J.2

Each Generating Unit ~ust be:

(al able to accept the signal (4-20 mAl &~nt from EGAT's AGC to adjust the set-point 1n order to regulate the Frequency and optimise the overall production cost;

(b) fitted with a rast acting proportional turbine governor which, when the Generating Unit becomes temporarily isolated from the r e st of the System will allow the aanerating Unit to meet customers' demandS and control System Fraquency to 52Hz or less;

( c ) fitted with Automatio Voltage Requlation equipment to control Generating Vnit terDinal voltage without instability over the full operating range of the Generating unit;

Cd) fitted with Fover System Stabilisers.

Each Ganarating unit must be capable of operating at its t hen current Capacity:

Ca) at any System Frequency in the range 49 . 5HZ to 50. 5Hz, and any decrease in Activa Pover output at Systam Frequencies less than 49.5Hz but not less than 47HZ shall be no greater than pro ra t a with sy.t~ Frequency; and

(b) et any power tactor between 0.85 lagging and 0.95 leading.

co_unieation Equipment at .. Power Plant

The Generator shall install, maintain and operate two indDp"ndent voice communication links between the Ganerator's Pover Plant control room and the EGAT Control cantra. These voice linkS Shall be the control Talephony associated with this Pov .. r Plant and shall be used for system operational purposes on ly.

The Generator shall install, maintain and operat e a facsimile ~achine, with a dedicated telephone line and number, located in the Ganerator'. Power Plant

CC - 3

CC (cont.inued)

control room ~nd shall inform EGAT of the t elephone number of this facsi~ile machine and shall have obtained from EGAT the telephone number of the facsimile machine or machines installed in the EG~T Control Centre for operational purposes (the supply of Which numbers, EG~T will not unreasonahly delay) .

CC.4 .3.3 The Cenerator $hall install, maintain and operate equipment at the Power Plant to provide the EGAT Control Centre with the continuous relllOte indications, measurements and tele~etry data as are specified in Schedule 2.

CC.4.3.4 The CeDeretor shall install, lDainta in and operate equipment at the connection point Which will provide the EGAT Contr o l Centra with such remote indications, .easurelDents, telemetry data and remote control of circuit breakers, Isolatinq and Eartbinq Devicea and other devices as are specified in Schedule 3.

CC.S PROCEDURE FOR CONNECTI ON

CC.S.l Sllblllbsion of Data and Intoraation

CC.5.1 . 1 Responsibilities at the Canerator

CC.5.1.1.1 At least 10 work i ng da ys prior to the date on which energising t he connection point is requestad, the Generator shall have, in respect of this Po •• r Plant and its associated Connection point:

(a) complied tully with the requirements of Planning Procedura, PP and shall, in particular, have submitted the data and intormation required pursuant to Planninq Procedure PP. J. 3 "Connection data and intormation" ;

(b) complied tully with the requirements ot Oper ating i':rocedu:re, OP7 ("Safety Liaison") ;

(c) submitted to BGAT a written request for energising of the Connection Point a nd the earliest date on which the Ganarator would wish this to take place;

(d) submitted to EGAT the information necessary

cc - 4

CC (continued)

for EGAT to prepare a Site aesponsibility Bcbedule, giving, tor the Power Plant:

(i) a schedule of all Apparatus;

(ii) a list of the individuals employed by the aenerator who will be responsible fol:' giving and I:'eceiving data and information required under Grid Code Procedure. OP2, OPS, OP6, OPS, SDPl, SDP2, SDP] giving theil:' names, job titl e s, I:'espons ibiliti es and, if not at the Pover Plant, their normal working location;

(e) submitted to BOAT written confirmation that its pover Plant for which agreement for connection is s ought conforms fully with the requirements of CC.4 (subject to any derogations gl:'anted by BGAT under Gel).

CC.5.1.1.2 On or before the date ot first enerqising of tho Connection Point, (but before the CODDection Point is energi sed) the GeDerator shall have satisfied EGAT, by the provision of evidence to BOAT in a form which BGAT sha ll I:'easonably require, that the aenerator has obtained all necessary aover~.nt authorizations I:'equil:'ed to be obtained by the aenerator for the construction and operation of the Power Plant in accordance with the provisions of all applicable Laws.

CC.S.I.2 Responsibilities of EGAT

CC . S.I.2.1 prior to the date on which energ is ing the Conn.etion pQint is requested, EGAT shall have, without unl:'easonable delay and in respect of this pover Plant and its associated Connection Point:

(a) complied fully with the requirements of operating procedure, OP7 ("Satety Liaison") ;

(b) prepared, agreed with and submitted to tho Gener ator a site Responaibility Schedule giving the following information (and, where appropriate indicating ownership and responsibility for control), for the PQwer Plant and on EG~T'8 side ot the Conneetion

CC - 5

CC (continued)

CC.S.2

CC.5 . 2. 1

CC.S.2.2

Point at the Connection point site:

( i )

( ii)

( iii)

(i v)

a s~hedule o t Apparatus;

a list ot services;

a sChedule ot telecommunications, measurement, telemet ry and control equipment;

a list of the individualS in EGAT who will be responsible tor giving and rece iving data and into~ation required under G~id Code Procadures OP2, OPS, OP6, OPS, SOPl , SOP2, SDP3 giving their names, job t itles, responsibilities and, i f not at the EGAT control cantra or, as the caSe may be, the Power Plant , t hai r normal working location;

(c) details at t he Local Safaty P~ocedures agre ed and t he names of the Satety Co­ordinatora, pursuant to the requirements of OP7.

Ins pection ot connection point

EOAT shall agree a date for the inspection at the Connaotion Point with the Generator (wh iCh date shall not be earlier than the date requested by the Generator under CC.5.l.l, but Shall not be unreasonably delayed by BGAT beyond that date) to carry out an inspection (and such tests as are required) of the Connaction Point, and any associated Apparatus , to the extent that it reasonably considers that this is necessary to ensur e that e nergia ing the connection Point will not jeopardise the sare and secure operation o f the EGAT systu.

When EGAT reasonably considers that the connection point is in all ways ready for the energising, it shall issue to the Generator a ce~tiricate or Readiness.In all other ca s es EGAT shall report the results ot this inspection, in writing, t o the Ganer ator. This report shall detail any areas whero, in EGAT's reasonable opinion, the Connection Point or any associat ed Apparatus is not ready to

CC - 6

cc (continuGd)

CC.S . 2.3

CC .5 .3

CC.,

CC.7

CC.7.1

a llow enorgisinq of the Connection Point.

In t he case wher~ EGAT has reported that the Connection Point or any associated Apparatus i s not ready for the enerqising of the c onnec tion point to go ahead, the Generator Shall make such changes to the Apparatus and/or ConnectioD Point as are r equired and shall inform EGAT when a f urther inspection can take place. EGAT and the Generator s hall aqree a date f o r this inspection (such aqree~ent not to be unreasonably withhel d).

Enerqisinq the Connection

Followi ng the issue by EGAT to the Generator of a [Certificat e of Read iness], the Connection point sha l l be energised at a date agreed between EGAT and the Generator , such agreement not t o be un reasonably withheld.

REGISTERED OPERATING CHARACTERI STICS

Information wh ich is requir ed to be submitted as pa r t Of the Detailed Planning Intormation and is cla s si f ied as Planned Operating Characteristics (under the prov i sions of Planning procedure, PP ) will be revised as necess ary f ollowing the energising of the relevant Connection point and commissioning of each new Generating Vnit within the Pover Plant. The r evis ed value s o f the Planned Operating Character i s tic. will be taken as the Regis tered Operating Ch«racteristics of the Generating Unit (which value shall reflect the true operating char«cteristics of the Generating Unit, deter~ined in accordance vith Prudent Practice ) .

SCHEDULE 1: REQUIREMENTS AND STANDARDS TO BE ADOPTED FOR APPARATUS FOR CONNECTION TO EGAT'S SYSTEM

,.J All circuit breakers, switch disconnectors. disconnectors, Earthing Devices, power transformers, voltage trans for mers, r eactors, current tra nsforme rs, surge arresters, bushings, neutral equipMent, capacitors, line traps, coupl i ng d evices, extern«l heavy polluted condit ion insulation and insulation co- or dination at the Oeneretor/EGAT

cc - ,

cc (continued)

CC . 7.2

connection Point shall comply with the ANSI / IEEE standards or NEel NEKA codes. except for certain devices whore other standards are pre fe rred and explicitly specified.

(b) Plant and Apparatus Shall be designed, manufactured and tested in premises certi fied in accordance with the quality assurance requirements of ISO 9000 as current at the Transfer Date (or equivalent as reasonably approved by EGAT) .

Requirements relatiDg to GeDer.tor/EGA~ Connection Points

CC.7 .2.1 Each connection bstween a Ganerating Unit and the EGAT Tran s.issioD System must be controlled by a circuit breaker capable of interrupting the maximum short circui t current at the point of connection. EGAT will supply on request to a gener ator valuss of short circuit current and the rating of EGAT circuit breaksrs at existing and committed Connect ion Points for future years.

CC.7 . 2 . 2 Genarating unit and powar station Protection ArrangalD.ent.

CC . 7.2 . 2.1 Minimum requirelllents protection of GenerAting Unita and the ir connections to the EGAT Transmission syst •• Dust meet the minimum requirements given below . These are necessary to reduce to a practical minimum impact on the EGAT Transmission Syate. of faults on circuits owned by Generators.

CC . 7 . 2.2.2 Fault Clearing Times

(al The fault clearance times for faults on the Generator ' s equipment directly connected t o the EGAT Transmisaion syate. and for faults on the EGAT Transmiss i on System directly connacted t o the Genarator'. equipment, from fault inception to the circuit breaker arc extinction, shall be:-(I) 80ms at 500 kV (ii) lOOms a t 230 kV (iii) 140ms at 115 kV and below

CC - 8

- .-

CC (continued)

,b,

,c,

,d,

For the event of failure of the protection system provided to meet the above fault cloarance time requirements, back-up protection shall be provided by the Generator with a fault clearance time not slower than 300 illS fo r faults on the HV Generator connections. EGAT will also provide back-up prot ection, which will result in a fault clearance time slower than that specified for the Generator back­up protection so as to provide discrimination. Generation back-up protection will also be required to withstand, without tripping, the loading incurred during the clearance of a fault on the EGAT Transmission System by breaker fail protection or back - up prot.e ction. This will permit discrimination between Generator back-up protection and back-up Protection provided on the EGAT Transmission System.

When the Generating Unit is connected to the EGAT Tr.n9~ission system at 230 kV or 115 kV and a circuit breaker is provided by the Generator, or EGAT, as the case ~ay be, to interrupt fault current i nterchange with the EGAT Transmission Syste., or Ganerat.or's System, as the case may be, circuit breaker fail protection shall be provided by the Generator, or EGAT, as the case ~ay be, on this circuit breaker. In the event of a failure to interrupt fault current by these circuit breakers, the circuit breaker tail protection shall t.rip all the necessary alectrical l y adjacent circuit breakers connected to the EGAT Transmission system wit.hin 250 ms of such a tailure to trip.

The tarqet perform"nC9 for the> protectiun Depundability lndux shall be not less than 99.5 ". Th is is a measure of the abil i ty of protection to initiate successful tripping of circuit breakers which are associated with the faulty item of Apparatus .

CC.7.2.l Equipment to be provided

CC - 9

cc (continued)

CC.7.2.3.1 Protection of Interconnecting connections

The reguirement s for the provision of protection eguipment for i nterconnecting connections will be specified as follow:-

Transmi ssion Line Protection

(a) 230 kV Ljne Protecti on. The protection of each line shall be a distance protection scheme, for use in conjunction with power line carrier signalling equipment. Each protection shall utilize directional comparison overreaching transfer trip scheme with backup relaying to achieve primary and secondary protection. There shall be high speed directional distance relays as primary pilot relaying, protection for both phase and ground faults. For backup protection against phase faults there shall be first, second, and t hird zone direction~l distance relays. For backup against ground faults there shall be_a dual-polarized directional over current relays, inverse time with instantaneous trip attachment. Each distance relay shall be o f the non­switched type. Out- of- step relays shall be provided with both primary and backup relaying to block the operation of distance relays for a power swing condition. Each relay line terminal shall be provided with breaker (ailure protection for each circui t breaker . ' Each set of backup relays shall be furnished with a separate timing relay that will provided time trip for zone 2 and zone J .

Each relay line terminal shall include single pole and threa-pole tripping and reclosing protection scheme. The three pole reclosure snall be done through a synchro-check relay.

(b) 115 kV Line Protect ion . The 115 kv line protection shal l be the static distance protection scheme with carrier transfer trip. It shall be of the permissive under­reaching scheme. Zone 2 and Zone 3 delayed trip shall also be included in the same

CC - 10

package.

Each 115 kv l ine protection shall be thre e­pole t ripping and reclosing. The three-pole reclosure shall be done through a synchro­check r elay .

CC . 7 . 2.l.2 Circuit- breaker failure Protection

The circui t breaker f ai lure protection will be i nsta lled tor eve ry ci r cuit

CC.7 . 2.l.l Pole-slipping Pr otection

equipment breaker.

The pole - slippi ng protection will be fitt ed on every g enerating unit.

CC.7.2.l.4 Tariff Metgring

Generators will install current and voltago transformer s supplying all t ariff met ers according to Appendix 1.

CC - 11

CC (continued)

CC.. SCHEDULE 2: REQUIREMENTS POR REMOTE INDICATIONS, KCASUREKEN'l'S AND TELEMETRY IN A POWER PLAN'!'

CC .8.1

CC . 8 .1.1

CC. 8 .1. 2

CC.S.2

CC.8.2.1

CC.8.2.2

Genarator'$ Power Plant must provide the remote terminal unit to send the signals for monitoring and control to National Control Centre (~NCC")

and lor Regional Control Centre ("RCC") where the requirements are:-

Monitoring signal to NCC and/or Ree

Binary signals

Generator circuit breaker status ("a" contact) Gonerator " Remota/local control " (irlf control) switch Generat.or "Fixedl free" Governor Operation status.

Analogue signal (4-20 mAl

Real p010ler (MW) Reaotiva power (MVAR) Generator voltage (XV) Set- point feed-back (HWI Upper MW regulation limit (KW) Lower KW regulation 1iait (MVAR) Loading rate (MW/min) Deloadinq rate (HW/min) Prequency (Hz I

Analogue signal to Power Plant (4 - 20 mAl

Real power output target set-point

Reactive power output target set-point

cc - 12

CC.9

CC.'.l.

CC.'. 1.l.

CC.'.1.2

CC.9.2

BCREnDt'-B 3 : REQIJIREMElITB POR REKOTE INDICA'rIONS, KEASIJREKENTS, TELEMETRY AND CONTROL AT A CONNECTION POINT

The monito~ing signal which must be sent t o NCC and/or RCC are as tollows

Monito~ing signal to NCC and/or RCC

Binary &igna19

Circuit breaker status (-a" contact) Line ground switch status

Analogue signals (~ 1 ~)

Bus voltage Bus frequency Line power !'low (KW) React i ve pover flow (HVAR)

Energy sale

Energy transact ion (KWh) Loss ot potential alarm

CC-13

CCA1

CCAl. . 1.

ceAl . 2

COAl.3

CCA1. ..

" ..

APPEND:tx 1

The metering and its facilities shall comprise the following:

Instrument Transformers

Instrument transformers tor revenue purposes shall have the accuracy class 0 . 2, rEe Standard 30 VA class 0.2 for C.T.and 15 VA class 0.2 tor P.T.

IS il owatt-houT Meters (Active Meters)

Each kilowatt-hour meter shall be t hree-current element, single tariff, solid-state, and export and import energy registration type. Each meter Shall have the accuracy class 0 . 2S . Each shall be equipped with puls e devices for re-transmitting the measured electrical energy to the universal telecount i nq instrument specified in Ite. 4 of this Appendix 1.

Kiloyar_ hgl!r HeteTs (Reactive Meters)

Each kilovar-hour meter sh~ll be threo-current element, single tariff, solid-state and export and import energy registration type. Each meter shall have the accuracy class 0.55. Each shall be equipped with pulse devices tor re-transmitting the measured e lectrical energy t o the universal telecounting instrument specitied in Item 4 ot this Appendix 1.

Universal Telecoyntj ng Instrument

The universal telecounting instrument shall have the fol lowing featUres:

24 telecountlng inputs; 8 control inputs; 8 output contacts; 1 datacard module with SRAM ; 1 thermal printer modu l e; 1 coamunication module, and complete with COHo

CCAl-l

CC - ll.PPEND:IX 1 {Colltinu.cSJ

CCA1.5

CCAI.6

CCAl . 7

CCAl . 8

and service module; 1 - lot ot thermal printing paper (tor two

years' supply).

Watttynr Transduc@r;

E3ch watt/var transducer shall be combined in the same enclosure. Each shall be 3-phase, J-wire, and 2-element type. Each shall be designed tor remote telemetering purpose.

Loss-of-potential Alarm Relays (27XM)

Each k ilowatt -hour ~etar and ki l ovar-hour matar shall be provided with a loss-ot-potential alarm relay tor monitoring availability ot the potential ot the meter potential circuits.

Test Switches

Each kilowatt-hour meter, kilovar-hour meter and each watt/var transducer Shall be individually provided with a test switch for testing either trom an external source ot energy or frOm the Instru~ent transformers by means of .ultipole test plugs, whiCh shall be provided for the purpose.

Stat ic :Inyerter

Each static inverter shall convert direct current power to essential l y sinusoidal AC power with maximum of fivs per cent harmonic distortion . All components of tho inverter shall be static devices and the major power components Shall be silicon contrOlled rectifiers. Each inverter shall inclUde n~ceeeary equipment to protect it tram overloads that occur on the output side of the inverter. Each shall be short circuit proof. In the event of a short circuit on the output side, no damage will occur to the static inverter.

Each inverter shall contain equipment necessary to protect it from eurges and spikes which are normally encountered on the DC systems in the substations . EaCh shall be designed and

CCAl-2

CC - ~PPENDIX 1 (Continued)

constructed so as not to cause interference with radio reception or telephone communic~tion circuits, in accord~nce wit h good modern practice.

Each inverter shall be provided with a contact for remote annunciation of output voltage failure.

Each inverter shall be furnished in conformance with the following characteristics and requirements:

rated output 100 VA continuous

output vol t age 2]0-/ + 5 t VAC

input voltage (battery voltage)

- voltage regulation

- frequency

du t y

cooling

phase

harmonic content

environment ambie nt temperature

humidity

80 to 1 20% of rated voltage ~s specified in bill of materials

: +5% no load to full load at O.S P F laggi ng.

+/ -5t DC input voltage, variation from SO to 120t rated voltage as specified in bill of materials

: 50 -/+ 0.05 Hz under all load condition

continuous

natural convection

single phase

5 deg. C to 50 deg . C

a to 95t

The inverter will be used as standby AC soUrce to the univer sal telecounting inst rument in item 4.

CCA1-3

OPl - DEMAND FORECASTING

OP1.l

OPl. 1. 1

OP1. Z

OP1.2.1

OP1. 3

OPl.] . l

INTRODUCTION

Operating Procedure 01'1 covers the preparation of De~nd Forecasts for the following purposes:

(.) Preparation of the Three Year operating Progrlllll;

(b) Preparation of the Yearl.y operating Program;

(0) Preparation of the Monthl.y operating Progrlllll;

(') Preparation of Ch" Weekl.y Operating Program; "C,

( ") Preparation of tho Dail.y Generation Program.

OBJECTIVE

The objectives of 01'1 are to :

(a) define the main sources of information to be used by EGAT in the preparation of the D~and Forecasts;

(b) describe the factors to be taken account by EGAT in the preparation of the DeMand Forecasts; and

(c) lay down procedures which will ensure that the Demand Forecasts for different timescales are produced on a consistent basis.

DEMAND FORECAST FOR THREE YEAR OPERATING PROGRAM

For each year of the Three Year Operating Program, the value of the Day Peak and Evening Peak and Reserve requirements for each month will be forecast by EGAT, taking account of:

(a) the annual Demand Forecasts and annual Load Factors extracted from the Load Forecast for t he Thail.and Electric System;

(b) historic records of Day peak and Evenin9 Peak values;

OFl - 1

OPl (contin~e~)

OP1.4

OPL 4.1

OP1.4.2

OP1.4.J

OP1. 5

(c) thB R.serve. policy as determined under OPf; ,"d

(d) lIny other int'ormation that EOAT, in its reasonable opinion, believes is relevant .

DEKAND PORECAST FOR YEARLY OPERATING PROGRAM

For each ~onth of the Yearly Opsratinq Program, the following values shall be forecast by EGAT:

(a) the volume at' electricity sales to MEA, PEA and Direct customers;

(b) the volume of electricity used in station Servic.s a nd Tra nsmission System Losses;

(e) the Day Peak and Evening Peak; and

(d) the Reserva required.

In producing the se for e cas ts, EGAT shall ta.ke aeeo~nt of,

Ca) the Dama nd Forecasts used in the production ot the Three Year operating pr ogram;

(b) the Annual Demand Porecasts and Ann~al Load Pactors extracted tram the Load Poracast tor tb. Thailand Electric System;

(c) historic records o f electricity sales to KEA, PEA and Direct c~stomer.;

(d) historic records of Day Peak and Evening Peak val~es;

(e) the Raserva policy as determined under OP4; ,"d

(t) any other int'ormation that EOAT, in its reasonable opinion, believes is relevant.

The Demand Poreeest. defined In OP1 . 4.1 shall be completed by the beginning of January ot' the year preceding the year tor which the Yearly Operating Program is to be produced.

DEKAND PORECAST FOR MONTHLY OP~RATINO PROORAM

OPI - 2

OP1 (continue~l

OP1.S .l

OP1.S.2

OPl.S.3

OP1.6

OP1.6 .1

For each day of the Monthly operating Program, the following values shall be forecast by EGAT:

(a) the volume of e lectr icity sales to MEA, PEA and Direot CUstomers;

(b) the vol ume of electr icity used i n Station Services and Transmission System L018es;

(c) the Day Peak and Evening Peak ; and

(d) the Reserve required .

I n produc ing these forecasts, BGAT shall take account of:

(a) the Demand Porac.sts used in the p roduction of the Yearly operating Prograa;

(b) h istoric records of electricity sa les t o MEA, PEA and Direct Customers;

(c) historic recordS of Day Peak and Evaning Peak values;

(d ) t he Reserve policy a s determined under OP~; ond

(e) any other information that EGAT , in its reasonable opinion, believes is relevant.

The Damand porecas t s d e f ined in OPl. S.l shall be completed by the e nd of third week ot the month preceding the month for Which the Montb ly operating Program is to be produced.

DEKAND PORECAST FOR WEEkLY OPERATI~G PROGRAM

For aach day of tho Weekly opera LIng program, the following values shall be torecast by EGA~:

(a) the volume o f olactricity sales t o MBA, PEA and Direct Customers;

fb) the volume ot electricity used in Station services and Transmission sys tem Lo ••• s;

(c) the Day Peak and Eveninq Peak; and

OPl - 3

I

OPl. (continued)

OPl.-6.2

OP1.6.J

OP1. 7

OP1.7 . l

OP1.7.2

OP1.7.J

(d) the Rese~ve required.

In producing t hese torecasts, EGAT shall take account of,

(a) the Deaand Forecasts used in the production of the Montbl.y operating program;

(b) historic records of electricity sales to MEA, PEA and Direct customers and, in particular, the records tor the latest week for which values are available;

(c) historic records of Day Peak and Eveninq Peak values and, i n particular, the records for the latest week tor which values are available;

(d) the Reserve policy as determined under OP4;

""d (e) any other informat ion that EGAT, in its

reasonable opinion, believes is relevant.

The Demand Forecast, dofined in OPl.6 . l shall be comple ted prior to the end of the week preceding the week for which the Wsekly operating Program is to be produced.

DEMAND FORECAST FOR DAILY GENERATION PROGRAH

For each hour of t ho Daily Gene~ation program, the following values shall be forecast by EGAT,

(a) the total Demand to be met, including the volume of electricity sales to MBA, PEA and Direct Customers and the volume of electricity used in station service. and Transmi.9ioD System Loss.s; and

(b) the Reserve requirA~.

In addition, EGAT shall forecast the value of the Oay Peak and t he Evening peak, and the hours in which they will fall.

In producing these forecasts, BOAT shall take account ot,

(a) the Oemand Forecasts used in the production

OPl - 4

OPl (continued)

OP1.1.4

of the Waakly Oparating Program;

(b) historic r~cords of electricity sales to MEA, PEA and Diract CUsto •• rs and, in particular, the records for the latest day for which values are available;

(c) historic recorda of Day Peak and Eveninq Peak valu~s and, in particular, the records for the latest day for which values are available;

,d, the forecast of weather for Which the Daily Ganeration be prepared;

the day for PrograJII is to

(e) the Resarve policy as determined under OP4; .nd

(f) any other information that EGAT, in ite reasonable opinion, believes is relevant.

The Demand Por.casts defined in OPl.6.1-0Pl. 1 .1 Shall be completed by 1000 hours on the day preceding the day for which the Daily aenaration Program is to be p roduced .

OPl. - 5

-

ap2 - MAINTENANCE SCHEDULING

OP2.1.

OP2.!.l

OP2 . 1.2

OP2.1.3

OP2.1.4

OP2.1.5

OP2.2

OP2.2.1

INTRODUC'l'ION

Operating Procedure OP2 is concerned with the co­ordination of the Generating Unit, Power Plant, EXternal Interoonnactor and Tran,qissioD Bystea maintenance and the r elease or Generating units and pover Plant. tor constrUction, repair and maintenance purposes.

The resulting Kaintenance Schadule produced by EGAT will have been prepared with full regard to the contents of the relevant Operating Programs and the Oaily Ganeration Program to ensure the matching ot generation output with ~orec •• t Demand (including an allowance for operating Reaerve) produced in accordance with OPI.

In this Procedura OP2, Year 0 means the current Fiscal Year, Year 1 .eans the next Fiscal Year, Year 2 means the Fiscal Year after Year 1, and so 0". Where inform~ticn must, in accordance with OP2, be SUbmitted on a particular day and that day i8 not a BU:llines8 Day, the infonnation shall be submitted en the last Businass Day before the due day.

Whilst BGAT will make every reasonable ende avour to acco=modate the Generators' requests for Outages at particular dates , considerations of System stability and economics may mean that such requests cannot be granted_ All Generators must accept that, where their request has not been granted and the_ conSUltation and dispute procedure described in this OP2 has been exhau s ted, EOAT ' s decision on outage dates is final and binding.

OBJECTIVE

The objective ot OP2 is to seek to enahl~ ~GAT to harmonise the Outages of all Ganerating Dnits or Power Plants, SZternal Interconnectors and the Transmission Bystem, whilst:

(a) maintaining sufficient available Generating Dnit, External Interconnector and Transmission Syatem Capacity to meet the Foree.at Deman~, including operating Reserve; and

OP2 - 1

OP2 (continued)

OP2.3

OP2 . 3.l

OP2.3.2

(b) paying attention to the need to minimise the cost to the System of releasing II Generating unit or power Plant for OUtage.

MAINTENANCE SCHEDULING1 YEARS 1 TO 7

On the first day of each of Fiscal year each Oenerator will provide EGAT, in writing, with a provisicnal outage program for Fiacal Years 1 to 7, giving for each of ite Generating units,

(a) the identification of tha Gener ating Unit;

(b) the HW of Capacity involved;

(cl where the out age is fo r sta tutory or insurance inspection reasons, the reason for the OUtaga and the date by which the work must be completed;

(d) the expected duration of the Outage, in days and weeks;

(oj the preferred start date for the OUtaga; ,,. (f) where there is a possibility of flexibil ity

in the dates, the earliest start date and the latest finish date.

On the first day or each or Fiscal Year each Sxternally Interconnected Party will provide EGAT, in writing, with a provisional outage Program for Piscal Years 1 t o 7, giving for each of its ~ternal Int. reonnectora:

(a) the identification of the External Intereonnector;

(b) tho HW of c~pucity involved;

(c) the eXPQcted duration of the outaqe, in days and weeks;

(d) the preferred start date for the Outage;

'"' (e) where there is II possibility of flexibility

in the dates, the earliest start date and

OP2 - 2

,

OP2 (continued)

OP2.3.3

the lateat finish date.

Betwee n the first day o f each Fiscal Year and the end o f week 12 or the Year EGAT will:

(a) prepare a Maintanance schedule for Piscal Y.ars 1 to 7 , taking account of the following:

(l)

(ii)

( iii )

the Forecast Demand as laid down in the Load Forecast tor the Thailand El eotric System;

the Maintenance schedule prepared in t h e previous Fiscal Year for Years 2 to 7 (which, by the passaqe of time, now represents the previously agreed Kaintanance schadule tor Years 1 to 6);

the SUbmi ssions from the Generators made under OP2.3.1 and from E_ternally Interconnected Parties under OP2 .3 . 2;

(iv) the requirements tor Transmi •• ion Syst .. outages ;

(v) the need to minimise, as far as is practicable, the total costs to the Sy.tem ot the required outaq •• ; and

(vi ) II ny other factors which, in EGAT'S reasonable opinion, are relevant;

(b) provide each Generator, i n writing and in respeot ot each of its Generating units for which a n Outaqe was requested under OP2.3.1, with the dates on which it i s proposed the outaqes will start and f i nish; and

(c) provide each Externally Interconnecte d party , in writing and in respect of each of its EXternal Interconnector~ for which an Outa9. was requested under OP2 . 3.2, with the dates on which it is proposed the Outaqe. wi l l start and finiSh .

OP2 - 3

OP2 (continued)

OP2.3.4

OP2.3.5

OP2.3.6

Where a User (other than EGAT) is unhappy with the outaqe Proqram allocated to any of its Generating Dnits or, as the ease may be, EXternal rnterconnectora, it may contact EGAT, in writing and no later than the end of week 16 ot the 'iscal Year, to explain its concerns . EGAT and the u •• r shall discuss the its concerns and seek to rasolve the problem. Where, in EGAT's reasonable opinion, the change requested by the User does not threaten System seourity or cause unreasonabl e additional costs to the syst .. , EGAi' shall agree to the change. I t the possible resolution at the problem requires the involvement of other Users, EGAi' may call a Deeting at the Users involved.

By the end of week 26 ot the Fiscal Year:

ell) each Ganerator will submit to EGA'l' an updated provisional outage Proqram, in the same torm and covering the same intormlltion as that submitted under OP2.3.1, which shall take account of any revisions to that Ganarator's outage requirements and any revisions to the Outaqa Proqram aqreed under OP2.3.4; and

(b) each Extarnally Interconnected Party will Submit to BGA'l' a n updated provisional OUtaqa Proqraa, in the samo form and coverin9 the saae information as that submitted under OP2.3 . 2, which shall take account of any revisions to that Bxtarnally Intarconnect.~ Party ' s Outaqe requirements and any revisions to the Outaqe Proqraa aqreed under OP2.3 .4.

By the end of weeK 32 of the Fiscal Ye.r, EGAT will:

(a) revise the Maintenance Sche~ula tor Fiscal Yaar. 1 to 7 . taking account or,

( i ) the Maintenance schedule produced under OP2.3 . 3;

(ii)

( iii)

any changes to the Maintanance Schs~ula agreed under OP2.3.4i

sny revisions to a Ganarator'. or !xternally rnterconnecte~ Party'.

OP2 - 4

OP2 (continued)

OP2.3.?

OP2.3.8

provisional outag-e Program submitted under OP2.J.5;

(iv) the requirements for Transmission System outages;

(v) the need to minimise, as f(l.r (l.S is practicable, the total costs to the System of the requested outages; . nd

(vi) any other factors which in EGAT's reasonable opinion are relevant ;

(b) provide each Generator, in writing and in respect of each o f its Generating c nits for which an outage was requested under OP2.3.5, with the da t es on which it is proposed the Outages will start and finish; .nd

(c) provide each Externally Interoonnected party, in writing and in respect of each of its External Interconnectors [or which an outage was requested under OP2.J.5, with the dates on which it is proposed the Outages will start and finish.

Where a User (other than EGAT) is unhappy with the Outag-8 Program allocated to any of its Generating Units or, as the case may be, External Interconnectors, it may contact EGAT, in writing and no lat er than the end of week 36 of the Fiscal Year, to explain its concerns. EGAT and the user shalr discuss the its concerns and seek to resolve the problem . Where, in EGAT's reasonable opinion, the change requested by the User does not threaten syste~ security or cause unreasonable additional costs to the System, EGAT Shall agree to t he change. If the possible resolution of the p~oblem r"''l"irt;'s th~ involv .. ", .. nt of other U".r", EGAT may call a meeting of the Users involved.

By t he end of week 44 of the Fiscal Year EGA~' shall have:

(a) produced a f inal ve~sion of the Maintenance schedule ( the Fina l Maintenance Schedule) for Viscal Years I to 7, based upon the Maintenance Schedule produced under OP?'.J.5

OP2 - 5

OP2 (continued)

OP2."

OP2.4.1

OP2.4 . 2

and incorporating any changes agreed under OP2.J.7;

(b) provide each Generator, in writing and in respect ot each of its Generatillg onite tor which an outage was reque sted under OP2.J.5, with the dates on which it is proposed the Outages wi ll start and finish; .od

(c ) provide each EXternally Interconnected Party , in writing and in respect of each o f its EKt.rDal Intercollllectors tor which an OUtage was requested under OP2.J.5, with the dates on which it is proposed the Outages wi ll start a nd finiSh.

HAINTENAUCE SC8EDULING, YEAR 0

The basis fo r the Maintenance Scbedule for Piscal Year 0 will be Phc.l Year 1 of t he pinal Maintenance Schedule produced and issued at the end of week 44 of the previous Fiscal Year in accordance with OP2 . J . 8 .

I n respect of outage. in Piscal Year 0 Which a r e either not included in the Final Kaintenance Schedule or for which some parameter has changed, e ach Generator will promptly infora EGAT, in writing. with the fo llowing details for each of its Generating Units concer ned:

(a ) the identitication at the Genera ting Unit.;

(b) the MW ot capacity involved;

(e) where the out.age is for statutory or insurance inspection reasons, the ~eason tor the Outage and the date by which the work must be completed;

Cd ) tho expected dur a tion ot- the outage, (and the o~ iginal agreed duration, as shown in t he Final Maintenance Schedule , if appropriato) in days and weeks;

( e l the preferred start date tor the OUtag.; (and the original agreed start data, as shown in t.he Pinal Maintenance Schedule, if appropriata); and

OP2 - 6

OP2 (continued)

OP2.4.3

OP2.4.4

OP2.4.4.1

(fl where there is a possibility at flexibility in the dates, the earliest start date and the latest finish date.

In respect of outages in Fiscal Year a which are either not included in the Final Maintenance Bcb~dule or for Which some parameter has changed, each EZternally Interconnected Party will promptly inform BOAT, in writing, with the following details for each of its External Interconnactors concerned:

(a) the ide ntif ication of the Externa l Interconnector;

(b) the XV of Capacity involved;

(c) the expected duration of the Outage, (and the oriqinal aqrluld duration, as sho",'n i n the Pinal Kaintenance Schedule, if appropriate) in days and weeks;

(d) the preferred start date tor the Outaga; (and the original agreed start date, as shown in the Vinal Maintenance schedule, if appropriate); and

(e) where there is a possibility of flexibility in the dates, the earliest start date and the latest finish date.

Montbly Maintenanoe Schedule

In respect of outage, in Piscal Year 0 Which are either included in the Pinal Haintenance SchedUle or for Which a request for Outage has been .ade under OP2.4.2, each Generator will, by the end ot week 2 of each month provide EGAT, in writing, with the following details tor the next two complete months and for each of its Generating units for which an Outaqe is required:

(a) the identification of the Generating Unit;

(b) the KW of capacity involVed;

(c) where the Outage is tor statutory or insurance inspection reasons, the reason for the Outage and the date by which the work must be completed;

OP2 - 7

,= • •

01'2 (continued)

OP2.4.4.2

OP2.4.4.J

(d) the expected duration of the Outaqe, (and the duration agreed with EGAT, if appropriate) in weeks, days and hours;

(e) the preterred start time and date for the outaqe; (and the start time and date agreed with EGAT, it appropriate); and

(f) where there is a possibility of flexibility in the times or dates, t he earliest star t time or date and the latest finish tine or date,

In respect at Outages in Piscal Year 0 which are either included in the Final Maintenance Schedul e o r for which a request for Outage has been .ade under OP2,4.3, each ~ternally Interconnected Party will, by the end oC week 2 ot each month provide EGAT, in writing, with the f ollowinq details for the next two complete months and for each ot its EXternal Inta r connaetors for whiCh an Outa9a is required:

(a) the identification of the External Interconna ctor;

(b) the HW of Capacity involved;

ecl the expected duration of the outaqa, (and the dur ation agreed with EGAT, if appropriate) in weeks , days and hours;

(d) the preferred start t ime and date for the outaqe; (and the start time and date agreed with BGAT , it appropriate) ; and

Cel where there is a possib il jty of flexibility in the timos or dates, the earliest start time or date and the latest finiSh time or date.

uuring tne 4tn week of each mont h of Pisoal Year 0, EGAT will examine the Maintenance Schedule for the next following month and revise it as necessary, taking account ot:

Ca) the Pinal Maintenance Schedule for the relevant qonth at Piscal Yaar 0;

OP2 - 8

Oi'2 (continued)

(b) any rev!.sions to the Demand Foracalt for the relev~nt month as produced in accordance with OPl .5;

(c) any requests for either new outaqa. o r revisions to Planned Outages made by the Ganeratora under OP2.4.2, OP2.4.J, OP2 . 4.4.1 or OP2.4.4.2;

(d) any other factors which, in EGAT's reasonable opinion, are relevant .

OP2.4.4.4 By the end of 4th week of each month EGAT shell have:

OP2.4.S

OP2.1.5.1

(a) produced a tinal version ot the Maintenance Sch"uSula (the Monthly Maintenance Schedule) for the next following month, based upon the Kaintenance Schedule produced under

• OP2.4.4.J;

(b) provide each Generator, in writing and in respect of each of its Generating Units for which an outage was requested under OP2.4.4.1, with the dates on Which it is proposed the outages will start and finish; "0'

(c) provide each Externally Interconnactad Party, in writing and in respect of each of its External Interconnectors for which an OUtage was requested under OP2.4.4.2, with the dates on Which it is proposed the OUtaqes will start and tinish.

Weekly Maintanance Schedule

In respect of Outages in Fisc~l Year 0 which a~e eithe~ includea in the Monthly Kaintenanca Schedule and fo~ which dates have been agreed under OP2. 4.4.4 or tor which" rP'l\!pst for out .. qe h.c been made under OP2.4.2, each Generator will, by 1600 hours each Wednesday provide EGAT, in writing, with the following details for the next two complete calendar weeks and for each at its Generatinq Units tor whiCh an outaqe is required:

(a) the iaentification of the Generatinq unit;

(b) the HW at Capacity involved;

OP2 - 5:1

OP2 {c:ontinued)

OP2.4.S.2

OP2.4.S . 3

(C) where the O\ltaga is for statutory or insurance inspoction reasons, the reason tor the outage and the date by which the work ~ust be completed;

(d) the eXpe cted dUration ot the O\ltaq" , (and the duration agreed with EOAT, it appropriato) in weeks, days and hours;

(e) the preferred start time and date for the outage; (and the start time and date agreed with EGAT, it appropriate); and

(f) where there is a possibility of tlexibility in the times or dates, the .. arliest start time or date and the latest finish time or date .

In respeot of outages in piscal Year 0 which are either included in the Konthly Maintenance Schedule and for which dates have been agreed under OP2.4 .4.4 or for which a request for Outage has been made under OP2.4.3, each Externally Intarconnactad Party will, by 1600 hours each Wednesday provide }:GAT, in writing, with the following details for the next two complete calendar weeks and for each of its .. ternal Intarconnactors for ~hich an outage is required:

(a) the identification of the EXtarnal Intarconnac:tor;

(b) the KW of capac:ity involved ;

(c) the e:ocpected duration of the outage, (and the duration agreed with EGA~, it appropriate) in weeks, days and hours,

(d) the preferred start time and date for the Outage; (and the start time and date agreed with EGAT, if appropri"t.); and

(e) Where there is a possibility of flexibility in the times or dates, the earliest start time or date and the latest finish time or da t ...

During the period from 1600 hours on Wednesday to 1600 hours on Friday of the weak concerned, EGAT will examine the Maintanance Schedule for the next

OP2 - 10

,1

OP2 (continl.led)

OP2.4.5.4

following week and revise! it as necessary, taking account of :

(a ) the Monthly Maintenance Schedl.lle for the relevant week of Fiscal Year 0;

1 b)

1 c)

any revisions to the Demand Forecast for the r elevant wee~ as produced i n accordance with OPl. 6;

an estimate of thle current Capacity available from Generating Units, External Inte rconnectors and t he Transmission system and an <lssessmenti Of this capacity which may become unavai~able for unplanned reasons;

(d) any r equests for outages made by the Generators or Externally Interconnected Parties under OP2.4.2, OP2.4.3, OF2.4.5. 1 01: OP2.4.5.2;

(e) any other factor s Which, in EGAT's reasonable opi nion, are relevant.

By 1600 hours on each Friday or the last working day of a week. EG~T shall have:

1 a)

Ib)

1 c)

produced a final version of the Maintenance Schedule (the Weekly Maintenance Schedule) for the next follbwing week, based upon the Monthly Maintenance Schedule produced under OP2.4 .4. 4;

provide each Generator, in writing and in respect of each o 'f its Generating units for which an Outage was requested under OP2.4 . 5.l, with the dates on which it is proposed the outages will start and finish; a"d

prOvide each Externally Interconnected Party, in writing and in respect of each of its External Interconnactors fo~ which an Outage ~a s requested under OP2.4.5.2, with the dates on which it is proposed the outages will start and finish.

OP2 - 11

OP2 (cont.inued)

OP2 .•• '

01'2.4.6.1

OP2.4.6.2

In respect at Outages in Piscal Year 0 which are either included in the Weekly MaintenancQ schedule and for which dates have been agreed under OP2 .•. 5.4 or tor which a request tor OUtage has been aade under OP2.4.2, each Generat.or will, between 1000- 1200 hours each day provide Ea~T, in writing, with the rollowing details for the next following day and for each of its aenerat.ing onit.s tor which an Outage is required:

(a) the identification of the aenerating Unit;

(b) the KW of capacity involved;

(c) the expected dut:ation of the Outaqe, (and the duration agreed with EGAT, it appropriate) in weeks, days and hours;

(d) the preferred start time and date tor the Outaqe; (and the start time and date agreed with Ea~T, if appropriate); and

(e) where there is a possibility of flexibility in the times or dates, the earliest start time or date and the latest finish ti.e or date.

In respect of outages in piscal year 0 which are either included in the .eekly Maintenance Sehadule and for whiCh dates have been agreed under OP2.4.4.4 or tor which a request for OUtage has been made under OP2.4.3, each Externally Intereonnecte~ Party will, between 1000-1200 hours each day provide EG~T, in writing, with the following details for the next tollowing day and tor each at its EXternal Interconnectors for Which an OUtage is required:

(a) the identification of the External Interconnector;

(b) the KW of capacity involved;

(c) the expected duration of the outage, (and the duration agreed with EG~T, if appropriate) in weeks, days and hours;

(d) the preferred start time and date for the

OP2 - 12

OP2 (eontoiD.lled)

OP2.4.6.]

OP2.4.6.4

outo.ge; (and tohe stoart toime and date agreed yith EOAT, it appropriate); and

(e) yhere there i~ a possibility of f l exibility in the times or r ates, the earliest start time or data and the latest finish time or date.

During the period from 1200 hours to 1600 hours on each day, EQAT w1 11 Qx;!tmine the Kaintenaru;:!e Schedule for the next folloYing d;!ty and revise it as necessary, taking account at:

(a) the .aekly Maintenanca Schedule tor the relevant day;

(b ) any r evisi ons to the Demand Porecant f o r the relevant week as produced in accordance with OPI. 7;

(c) an estimate of the current capacity available from Generatinq Units, External Intereonnectors and the Transmi.sion System and an assessment of this capacity whiCh ~ay become unavailable for unplanned reasons;

Cd) any requests tor outages made by the Oaneretors or EXternally Interconnected Partie. under OP2.4.2, OP2.4.3, OP2.4.6.1 or OP2.4.6.2;

Ce) any other factors which, in EGAT'S reasonabl e opinion, are relevant.

By 1600 hours on each day EGAT shall have:

Cal produced a final version at the Maintenance Schadula (the D~ily Maintanance Sehedule) for the next followinq day, based upon the ••• kly Haint e nAnce Schedule p~oducgd undgr OP2.4.5.4;

(b) inform any Generator for which an Outage has been agreed for any ot its Genarating unit. in respect at the next following day as to Whether or not the Genaratinq unit can be rel.a$9d tor its outaga; and

(c) inform any Externally Interconneetad party

OP2 - 13

OP2 ( continued)

.

for which an outaqe has been agreed tor any ot its EXternal Interconnactors in respect ot the next following day as to whether or not the External Interconnactor can be released for its outaga.

OP2 - 14

OP3 - OPERATIONAL PLANNING

OP3.1

OPl.l.l

OPl.l.2

OP3.2

OPl.2.1

INTRODDCTION

Operating Procadura OPl is concerned with the production of the operating Programs over the timescales ot 1 year and 1 ~onth . The praparation of the Oparatinq Programs requires the matching ot torecast generation output with the Porecaat ORmand, including Operating RRserve, produced under OP1. The Operating Programs (described in this OPl) and the Maintenance Schedules produced under OP2, are developed in parallel.

The obligation in t his OP3 to tnke account ot irrigation requirements and reservoir levels reters only to such .atters within Thailand.

OBJECTIVE

The objective of this Procedure OP] is to allow the production or Operating Programs Which:

Ca) show the Porecast Demand and torecast Generation Cincluding Ieports and £aports across External Interconnections), allowing the adequacy ot the Plant Margin to be seen;

(b) allow the Generation, ExtRrnal Interconnactor and Transmission outaqas to planned taking account of the overall acono.ies ot Systam operation and the need to maintain system stability;

(c) a110w the optimisation of the Hydro and Thermal regimes, taking account of any I.po~t$, f orecast fuel restrictions, environMental restrictions and the need to provide irrigation water from the dams; and

(d) assist in the identitication and solution of operational problems and to allow the e ffect i veness ot Procedures to ove~come these problemS to be assessed.

OPJ - 1

"

OP3 (Continued)

OPl .3

OP3.3.~

OPJ.'.2

YEARLY OPERATING PROGRAM

The Yearly Operating Program is prepared On a Fiaeal Yaar basis. It will show the following:

(a) a statement of monthly Generation output and. Demand;

(b) a Generation, EXtarnal Interconnactor and Transmi •• ion Systam Outage program, prepared in accordance with OP2; and

(e) monthly reservoir operation and irrigation requirel:lents.

The timetable for producing it is laid down below.

Between the beginning Of the riscal Yaar and the beginning of January, EGAT will:

(a) obtain the relevant Demand Forecasts 1n accordance with OP1;

(b) produce .. draft of the expected Generation, EXternal Interconnector and Transmission HaiDtenanoe Sohedule for the year in accordance with OP2i

(c) determine, in diacus$ion with EXtarnally Interconnected Parties, forecasts of Import s and Exports and the cost of Imports across the EXtarnal Intarconnectors;

(d) determine irrigation demand for each month from historic and climatic data and through discussions with the Royal Irrigation Department:

(e) forecast reservoir levels for each month at the year from considerations ot, amongst other thin9~, hiotoric Gnd climatic udLd and expected irrigation requiraments for its Plants. Independent power Producer, shall forecast reservoir levels tor their respective Plant. and provide the f orecasts to EGAT within this same time period;

(f) establish a Marit Order of all Paver Plants, in accordance to the rules laid down in SDPl. 6, and taking into account

OP) - 2

I

OPl (Continued)

OPl .]. ]

OP].].4

OP].] . 5

their forecast Cuel avai l ability and ~osts.

Bet~een the beginning of January and the end of May, EGAT will:

(a) take a~count of any proposed or agreed changes to the Demand Porecast (produced according to OP1) and the MaintenancB scbedule (produc ed according to OP2);

(b) optimise, as far as is practicable, the parallel operat i on of Hydro and Thermal Pover Plante, taking account o f any Imports , irrigation r equire •• nts, environmental restrictions and fuel restrict:ions;

(e) dete rmine the total System costs, including the costs of Generetion, the costs of Import. , the cost s of restrictions resulting from Generation, External Inter~onnector and Transmission System OUtage s and the cost s of out- of- Merit operatio n of Thermal Power Plants; and

(d) Prepa re a tirst draft of the Yearly opsratinq Proqra. for internal review.

BetWeen the beginn ing of June and the Bnd of August, EGAT will:

(a) finalise the Yeerly opera ting proqr~, taking a ccount of any factors that EGAT, in its rea sonable opinion, believes are relevant; and

(b) issue the Yea rly Operating PrQqram.

EGAT sha ll continually moni t or the Yearly Operating" P,"ogra .. la9di" .. l " "y .tltpected changeS to t.ne program. In the case of sign iricant problems which will have, or Day have, an effect on the expected oper a tion, EGAT will consider it, in i ts reasonabla opi n i on, the Year ly Ope rating Proqram will nQed to be revised and re-issued. In such a case, EGAT will carry out such investigat ions and actions, as laid down in OPJ.l.2, OP] . l.l and OP].l.4, as it deems necessa,"y .

OP l - J

OPJ (contin~e4J

OPl.l.6

OPl."

OPJ.4.1

OPJ.4 . 2

Examples ot thCl "significant problellufI;" mentioned in OP] . ].5 wo~ld be:

(a) the long term breakdown ot a Generating lIni t;

(b) the long tel;"ID breakdmm of an External IntereoDn.etor;

(c) abnormal Hydro run-off conditions;

(d) significant postponement of Oeneretion or TransmissIon systum invest.ents.

KONTHLY OPERATING PROGRAM

The Konthly Opsrating Program is prepared on a calendar month basis and is based upon the relevant month of th4 Yearly Oparat ing Program. It will show the following:

(a) a statemant ot daily Generation output, Imports and Demand;

(b) a Generetion, Exter nal Intereonneetor and Trans.i.sion System outage program, prepared in accordance with OP2; and

(c) daily reservoir operation and irrigation requirements.

The timetable fOl;" pl;"odueing it is laid down below.

Between the start at week 3 of the preceding month and the end at that month, EGAT will:

(a) obtain the l;"cievant DeQanrl Forecasts in accordance with OPI;

(b) produce a dratt of the expected Generation, EXte~nal lntereonneetor and Trans.ia.ion Maintenance Schadule for the month in accordance with OP2;

(e) determine, in discussion with Exte~nelly Interconnected Parties, forecasts ot

OPJ - 4

OP3 (Continuad)

t~ports across the Rat.rnal tnterconnectors;

(d) determine irrigation de~and tor each week at the month from historic and cliaatic data and through discussions with the Royal Irrigation Department;

Ce) torecast reservoir levels tor each week at the month from considerations at, amongst other things, historic and climatic data and expected irrigation requirements;

(f) optimise, as tar as is practicable, the parallel operation of Hy4ro and Tbe .. al pover Plants, taking account ot Imports, irrigation requirements, environmental restrictions and fuel restrictions;

(9) establish a Karit Or4.r of all Pov.r Plants, in accordance to the rules l.id down in SDPl.6, and taking into account their (orecast fuel ava ilability and costs.

(h) determine the total System costs, including the costs o f Generation, t he costs ot restrictions resulting tram Oeneration and Transmission By.tea outages and the costs ot out-o(-Kerit operation of Thermal paver Plants; and

(i) issue the Montbly Operating Program.

OP3 - 5

OP4 - OPERATING HARGIN

OP4.l.

OP4.1.1

OP4.2

OP4.2.1

OP4 . ]

OP4.l.l

OP4.3.2

OP4.3.2.1

OP4.3.2.2

OP4.3 . ]

OP4.].:).1

INTRODUCTION

Opereting procedure OP4 sets out the rules tor determining the Operating Margin to be Scheduled and Dispatcbed on the system.

OBJECTIVE

The objective of OP4 is to set out and describe t he operating Margin which may be utilised by EGAT pursuant to the operation of Operating Procedure. OP2 and OP) and Scheduling and Oispatch Procedures SDP.

CONSTITUENTS OF OPE.~TING MARGIN

The Operating Margin comprises Contingency Reserve and Operating Reserve.

Contingency Ressrve

Contingency Reserve is the margin of Generating Unit forecast ava ilabilit ies over Forecast Demand which is required in the period from 2 4 hours ahead down to real time to cover against uncertainties in Generating Unit aVailabilities and Forecast Demand errors. It is provided by Generating Units Which have not been Instructed to Synchronise but which are available to Synchr o n ise within the required timescale and may addi t ionally be prOVided through additional Imports or decrease Export across an External Interconnector.

The amount ot contingency Re~erve required will be determined by EGAT on the basis of historic trends in unplanned reductions at Generatinq Unit availabilities or Imports and unplanned increases in Poreca.t Demand.

Operating Reserve

Operating ReBer ve is the additional output a vailable from Gen.~ating units or acros s an EXt.rnal Int.rconnector (which is operatinq as a synchronous interconnector) or the reduction in Demand Which is available in real time operation to contribute to containing and correcting any redUction of system Prequency reSUlting from an unplanned los& ot Generation or Imports or an Increase in Demand.

ON - 1

0514 (cont inued)

0514.3.3.2

0514.4.

OP4.4 . 1

OP4 .4. 2

Th~ amount ot Op.ratin9 Reserve required will be dete r mined by EGAT havi ng regard to historic trends in unplanned redu cti ons o f Generating unit availabilities, the largest secured l oss ot Generation (or, it greater, loss at Import from or s udden BXport to an Ezternal System via an EXternal Interconnector) and unplanned increases in Foreca~t Dem.nd.

RESERVE: POLICY

In preparing the Damand Porecaste (as laid down in OPl.) , t he Maintana.nca Schedules (as laid down in OF2), the Operating Programs (as laid down in OF3 and SOP1) and the Daily Generation Program (as laid down in SDP1 ) and in Dis patching GeDer.tion, Imports or Demand Cas laid down in SDP2 and SDPl) , EGAT shall set the l evels of Reserve and cons ider the requirements for in accordance with the requirements of th is 0514.

In Scbeduling and Dispatch ot Ganerating Units or Imports (or, as the case m~y be, Demand), EGAT, to the eKtant tha t it bel ieves t hat it is reasonable so to do, shall t~ke account of the total tuel cost at the Tbermal aenerating Units, any restrictions o n By~ro Pover Plant operation, the Operating cbaracte tistics at the Generating Units and any o thet constraints On System operation.

OF4 - 2

... =, I ____ '

OPS - XONITORING AND TBSTING

OP5.1

OP5,1.1

OP5 ,1. 2

OP5,1.1

01>5.1.4

OPS . 2

OP5,2,1

INTRODUCTION

opereting procedure OPS is concerned with the monitoring of Generating Unit performance and the calling f or specific tests of Generating Units,

The monitoring of Generating unit performance will be carried out to allow BGAT to ascertain i f there is reason to belieVe that a aanerating unit cannot operate in compliance with its operating Charaoteri stics.

The testing of Generating unit performance .ay be carried out:

(11) at IIny time, subject to cert",in restrictions, by EGAT to confirm the values of the Generating Unit's Operating Characteristica;

(b) if EGAT reasonably believes, following monitoring Of the aenerating Unit's performance, that it cannot operate in compliance with its operating Characteristics; or

(e) if Ganerator wishe s a test performed on its own Generating Unit following the correction of a problem which, following previous monitoring or a previous test, had caused a n Operating Characterietic Of that Gene rating Unit to be revised.

In this OPS, the term Operating Character istio exclUdes all Econoaic operating Character istics (which shall not be subject to moni toring or test).

OBJBCTIVE

The objective nf t.h\ fII OP5 i .. to:

(a) ensure that a means oxis ts tor EGAT to confirm the actual value of any Opera ting Char acteristic in respect ot any Generating Unit;

(b) provide a meChanism Which obliges a Generator to revise the value of any operating Characteristic where monitoring or testing suggests that the current

OPS - 1

- II

OP5 (continued)

OP5.3

OPS.l.l

OP5.3.2

oP' . ) . ]

offered value is incorrect; and

(e) provide a mechanism which allows a Generator to call for a test ot its own Generating unit when a problem which has caused it to revise the value of any Operating Characteristic has been corrected.

MONITORING

EG~'l' may at any time monitor the performance of a Generatinq onit by comparing its actual output (or response) with the output (or response) whiCh it should achieve according to its then current Declaration of Operating Characteristic. (made pursuant to SDP1) and the Dispatch Instruotions to which it should comply (save only that, if the extent of f ailUre to follow the Instruction is within the allowable tOlerances given in SDP2.S.2.2 , then no failure will be assumed).

If, through its monitoring of a Generating Unit's perfonnance, 8GAT deterlllines that, in its reasonable opinion:

(a) the GaDerating Unit is failing persistently to meet any of its t hen current operating Characteristics; or

(h) the GeDerating unit has failed to meet its then current Operating Characteristics in a way, liS de fined in OPS. 3.S, which requires action to be taken even thought the failure is not persistent;

then EGAT shall notify the relevant Generator giving detai l s of the monitoring Which has been carried out and the results of this moni toring.

upon receipt of the notification issued under OPS.3.2, the Generator will, as soon as possible, provide EGAT with:

(a ) an explanation of the failure;

(b) revised values of the relevant opsrating Charaoteristios which it proposes to include in its Declarations made under SDP1; lind

OPS - 2

OPS (continue~)

OPS.l.4

OPS.l.S

OPS ••

OPS.t.l

OP5.4.1 .1

OPS.4.1.2

(c) its proposals to rectify the proble ••

EGAT and the Generator will discuss the Generator'. sub~ission made under OPS.l.) and will try to reach agreement about the Generator's proposals and the revised values of the operating Characteristics. If such agreement is reached then the Ganerator will declare such revised value or values (under SOPl) until such time as the problem causing the revision to the Oparating characteristic has been solved and tha Generator has provided such evidence to EG~T as EGAT may reasonably require (which may inclUde a test of the Ganerating Dnit). If no such agreement i s reached within l working days then EGAT reSerVeS the right to call for a test at the Genarating unit.

The types at tailure which are ot such severity that evi dence ot persistent failure is not required (as required by OPS.3 .2 (b)) are:

(a) failure to Synchronise when rnstructa~i

(b) Da-Synchronising when not so Instructe~.

TESTING

Testing procedure

All tests (ather than those concerning automatic frequency response, the noti fication procedure for Which is laid down in OPS.4.1 . 2) shall be initiated by EGAT issuing the relevant Dispatch Instructions under SDP2. On th~ issuing of the first Instruction at a test, EGAT will intorm the Generator that this Instruction is for a test. On issuing the final Xnstruction at a test (or with the first Instruction it the test requires only one Instruction), EGAT will inform the Generator that this Instruction is the last one in th A t@~t and wili also into~ the Generator of the time at which the monitoring of the performance of the Genarating Unit will cease for the purposes of the test.

Testing of the autonatic response to variations in Bystam Frequency at a Ganerating unit will be carried out during the normal operation of the Syst .. and no special Xnstructions will be issued. The Generator wil l, however, be informed by 1600 hours that such a test of its Generating Dnit will

OP5-3

OPS (continued)

OPS .4.l. l

OPS.4.1.4

OPS.4 . l.S

OPS.4 .1. 6

take place d uring the next fol lowing day .

A test will only be valid if it requires the Generating Unit to perform a duty or duties which are within i ts capabilities a s given by its o perating Ch~acteri.tic. which were current at the time of the issue o f the first Dispatoh Instruction of the test (or , in the casa of a test of automatic fr equency response, at the time the Generator was informed that a test would be c a rried out). If, atter receiving the first Dispatoh Instructio n ot a test (or, in the case of a test of automat ic f requenoy responsQ, a fter the Generator was informed that a test would be carried out ), a Generator dec lares revised values o f the Operating Ch.ra cteris tics which were t o be t est o d , a nd s uch revision reduces the capability of the Generating unit to perform any relevant duty, then EGAT may assume that the t e st has been, or will be , tailed.

Any test will be o f up to 60 minutes duration. Ouring the monitor ing of the test , EGAT will keep a record the pertor.ance of the Generating unit in Such a way as to allow independent ver ification of the resul ts. In addition, where the response at the Generating Unit requires System Preque ncy or system Voltage to he examined, EOAT will keep recor ds of these values tor the per iod of the test.

I f, through its testing ot a Generating Unit's performance, BOAT determine s that, in its reasona ble opin ion, the Generating Unit is tailing to meat any of the Operating Characterietio. which are being test ed t hen BGAT shall notify the relevant Oenerator giving details o f the t esting which has been carried out and the results of this testing.

Upon receipt of the not ification issued under OPS.4.l.S, the Oenerator will, a s soon ~~ poooible, provide BGAT with :

(a) an explanat ion ot t he fa ilure;

(b) r evised values ot the r e levant Operating Characteristics whiCh it propoees to inclUde in i t s Oaclarations made under SOPi; and

(e) its proposals to rectify the probl e m.

OPS - 4

I

OPS (con~inued)

OP5.4.1.7

OPS .4.1. 8

EGAT and the Gen.~.~Q~ will discuss the Gena~.~Q~'S submission made under OP5.4.1.6 and will try to reach agreement about the Generator', proposals and the revised values of the operating Characteristics. If such ag~eement is reached then the Genarator will declare such revised value or values (under SDPl) until such time as the proble. causing the revision to the Operating Characteristic has been solved and the Gane~ator has provided such evidence to EGAT as EGAT may reasonably require (which may include a re-test of the aanerating Onit). I f agreement cannot be reached within 3 working days then EGAT shall initiate a re-test and both Parties will abide by the results of this re-test.

rf, as the results of a test (or re-test) initiated by BOAT, the operating Characteristies of a aanarating On it must be revised pursuant to OP5.4.l.7, £OAT ahall be entitled to take the following actions:

Ca) if the test was called other than as the result of monitoring or the failure of the Generat in9 unit in a previous test (and was not a re-test caused by a failure to agree revised operating Characteristics), then EGAT may assume that the operating Characteristics Which reguire revision will take the revised values (which were agreed under 0<'5. 4. 1. 7) trom t he issue time of the first Inat.ruct.ion of the test (or, in the case of a test of automatic trequency response, at the time the Ganerator was informed that a test would be carried out);

(b) it the test was called as the result of ~onitoring ot the Generatinq Unit, then EGAT may assume that the operating Characteristics which require revi~i"n will take thc revised value(s) tl:om the time at notitication to the Generator undel: 0<'5.3.2;

(c) if the t est Was a re-test caused by a failure to ag ree revised Operatinq Characteristics, then EOAT may assume that the operating Characteristics which require revision will take the revised values (which were agreed under OP5.4.1.7) from

OPS - 5

OPS (continued)

OPS.4.1.9

OPS . 4.2

OPS.4.2.1

the time which would have applied if the results of the original test (of which this is the re-test) had been accepted.

Following a test (or re-test) initiated by the Generator, the values of the Operating Characterietice of a Generating Unit agreed under OPS .4.l. 7, shall be assumed by EGAT to have applied from the time Which the Generator had not ified EGAT u nder OPS.4.3 that i t was ready f or the Generating Unit to be tested.

EGAT's right to initiate teata

EGAT may test a Generating unit at any time and that test may he of anyone or a c ombination of Operating Cbaracteristics, provided that EGAT does not test any s ingle Generating unit more t han three times in anyone calendar year except in the following circumstances:

(a) the results of the test showed that the value of one or more Opera ting Cheracteristics (whether or not the test was specifically designed to test this Operating Chara cterietic) was not as dec lared by the Generator; or

(h) conditions on the System were such that the test had t o be abandoned and it is reasonable to assume that EGAT could not have predicted that such conditions would occur (in which case the test is declared void); or

(c) the test i8 called as a result or monitoring Of the Generating unit porformance and EG AT notified the Generator, under OPS.3.2 that it believes that one or more of the rplevant G.D.rat~Dq Dnit Operating characterietics needs r evision and EGAT and the GeDerator tail to reach agreement, under OPS.3 .3, of the appropriate value ot the operating Characteristic; or

(d) the test of the Gensrating Dnit is called in r esponse to a reques t , under OPS.4.3, for a test, trom the Generator who owns (or operates) this Generating Unit.

OPS -6

OPS.4.l

OPS.4 . l.1

OPS.4.J.2

OPS.4.l.3

Generator's right to request tasts

A Geuarator may only request B test of a Generating Unit in the following circumstances:

(a) the Generating Onit f or which the test is reqUested is owned (or operated by) the Ganaratori and

Cb, (i) the Operating Characteristics ot the Genarating Unit have been revised following a problem in respect of the Generating unit, the problem has now been solved and the Genarator wiShes to obtain proof of the impr oved operat ing Charactaristics; or

(ii) the test is a commissioning test of the Generating onit following its first construction or any major maintenance, alteration, modification or re-conetruction.

A Genarator will, subject to the provisions of OP5.4.3.1, request a test ot a Ganarating Unit by submitting a written test request to EGAT, containing the following intoraation:

(a) the date of submission of the request tor test;

{b) the earliest date a t which t he test can commence (which date shall be no earlier than 2 working days later than the date ot submission of the test request);

Ie) the identification ot the Generating Unit;

(d) t he Opara~in~ Cb.r.ot .ri3tic~ which ~r~ to be tested; and

(e) the values of the Operating Characteristics which the test is expected to verify.

EGAT will .ake all reasonable effo~ts to schedule the test to start within 2 working days of the earliest date given by the Generator on Which the test can start. In the event that EGAT is unable to schedule the test within this time period, both

OP5 - 1

OP5 (continued)

EGAT ~nd the Generator will essume that the Generating Unit has bee n tested and that this test has veritied that the values ot the Operating Characteristics given in the test request are correct .

OPS - 8

•

OP6 - OPERATlONAL LlAlSON

OP6.1

OP6.l.l

OP6.1.2

OP6.2

OP6.2.l

lNTRODUCTlON

Oparatinq Procedure OP6 sets out:

(~) the requ i remants for the exchange of inform5tion concerning Operations which ~ay h5ve an Operational Bffect and/or Incidents ; and

(b) the rules for the investigation of a Significant lnc ident .

The terms bel ow have the following me5nings:

Ca) an Oparation is a schedu led or planned action relating to the operation Of any part of the sy,tem; ,., an oparational Bffect is an etfect on the operation of any p5rt of the System which may requ i re EGAT o r any other vssr to operata in a non-st5ndard way in order to minimise the ch5nce of the Operating Standards being b r eached;

(c) an Inc ide nt is 5n unplanned occurrence on, or relatad to, the Syat .. Which has caused, or could h5ve caused, a breach of the Ope r ating St5ndarda or which has caus ed injury to any individual; and

(d) a Significant Incident is an Incident which in EGAT's reasonable opinion has caused, or could have caused , a syate. Emergancy or serious injury to 5n ind ividual.

OBJECTIVES

The objectives of this OP6 are to define procedures $0 th~t,

(~) the implications of Operations which may have en operational Bffect can be cons ide red in advance and the appropri5te actions taken; and

(b) Incide nts and the reason for their occurrence can be ident ified and, where necessary, investigated.

OP6 - 1

OPIS.3

OP6.J.l

OP6.J.2

OP6.J.J

OP6.J.4

OP6.J.5

PROCEDURES REL~TrNG TO OPERATIONS

In the case of an operation on any part of the Tran,~i"ion System which has had or may have an Operational Effect, EGAT will notify any U.ers Whose operation may, in EGAT's reasonable opinion, be affected by the Operation, as soon as is reasonably practical (and, in any ev~nt, before the Operation is initiated, unless such delay would itself increase the risk of an operational Effect or an rncident) of the operation in accordance with the proviaions of OPS.J.5.

In the case ot an operation on any Power Plant or External rnterconnector Which has had or may have a n operational Btfect , t he relevant Gener ator or, as the case may be, Externally Interconnected Party will noti fy EGAT, as soon as is reasonably practical (and, in any event, before the Operation is initiated, unless such delay would itself increase the risk of an Operational Effect or an Incident) of the operation in accordance with the provisions of OP6.J.5.

In the case of an operation notitied to EG~T under the provisions of this OP6 . J.2, BGAT shall itself not i fy any Usera Whose operation may, in EG~T'S reasonable opinion, be affected by the Operation, as soon as is reasonably practical, ot the Operation in accordance wi t h the provisions of OP6.J.5.

On receipt of any notification of an operation issued pursuant to this OP6.J, and subject to the provisions of OP6 . J.6, any recipient may contact the U.er issuinq the notification to seek c laritication and that U •• r, in so far as it is able and the request for information from the recipient is reasonably required for the recipient ton decide upon wh",t action l L coulO take, will:

(al provide the anSWers required; and

(b) circulate copies of the questions and answers to all recipients cf the notification.

A notification and any respons e to any questions asked under OP6.J.4 will, subject to the provisions of OP6.J.6:

OP6 - 2

OP6 (continued)

OP6.3.6

OP6.3.7

(a) contain the name, position and organization ot the individual i ssuing the notification and the date and t ime of issue;

(b) be of sutticient detail to enablo the recipient of the notification reasonably to consider and assess the risks to its own operation and to put in place any reasonable plans which may be applicable to reduce this risk.

Where EGAT is notified by a Us.r, under OP6.3.2, of an OperatioD and, under ops.3.3, notifies other V.era of thia Operation, EGAT will include the name and organization of the individual reporting the Operation on behalf ot the User. Recipients of such a notification May seek clarification as if this individual had issued the notification to other Dsers .

Examples of operat i ons which are reguired to be reported under this OP6 include, but are not limited to, the following:

Ca) the withdrawal of any item Of Power Plant equipment fr om service for Outage or Testing (other than as approved by EGAT pursuant to the provisions of OP2 or OPS), which may reduce the Reliability of the Syst.lI; or

Cb) the withdrawal of any item of Transmission systea or ~ternal Interconnec~or equipment from service for Outage or Testinq (other than as approved by EGAT pursuant to the provisions ot OP2 or OP5) ,which may reduce the aeliability of the System; or

(e) the carrying out of Tests on any Pover l'l .... t O~· ~"'t.rn.l Int.erconnector equipment even when this does not require the removal from service of this equipment; or

(d) the operation ot any circuit breaker or Isolating Device or Earthinq Device, other than under Instruction from BGAT; or

(e) any other instance of non-standard operation Which the Dser has to instigate, other than when it is so Instructed by

OP6 - 3

OP6 (continued)

EGAT.

OP6.. PROCEDURES RELATlNG TO INCIDENTS

OP6 .... 1 Initial reportinq ot an Incident

OP6.4 . 1.1 In t he case of a n Incident on any part at the Trans.is. ion System which has had or may have had an Operational Etrect, includinq an Incident which was itself caused by an Incident on a power Plant or EXternal Interoonnector, EGAT will notity any Us.r. whose operat ion , in EGAT's reasonable opinion, had been or may have been affected by the Incident , as soon as is reasonably practical, in accordance wi t h t he provis i ons of OP6.4.l.4.

OP6.4 .l. 2 In the case of an Incident on any Power Plant or EXternal Interconnector whiCh has had or may have had an Operational Effect , the r e levant Generator or, as the case may be, EKternally Interconnected Party will notify EGAT , as soon a s is reasonably practical, of the Incident in accordance with the provisions ot OP6.4.l.4.

OP6.4 .l. J On receipt of any report of an Incident issued pursuant to this OP6.4.1, any recipient may contact the User issuing the report to seek clarification and that User, in so tar a s it i s able and the request f o r in formation from the recipient is reasonably required for the recipient to a s sess the implications and riSks arising from the Incident , wil l provide t he answers required.

OP6.4 . 104 The report of an Incident and the answars to any questions aris ing r rom t ha t report may be given orally or in writing and ~ust:

(al contain the name, position and organization of the individual i ssuing the report and, 1n the cas~ at a written report, the date and time of issue;

(b) Where an Incident has caused injury to any individUal, details o f t he injuries caused ;

(c) include, sO far (15 this is possible, SUfficient detail t o allow t he recipi e nt to assess the operational implications and risk arising from the Inc ident.

OP6 - 4

OPILI (continued)

OP6.4.1.5

OPIIi ••• 2

OP6.4.2.1

OP6.4.2.2

OP6.4.J.l

When a report of an Incident is given orally:

(al it will be dictated by the sender to the recipient, and,

(h) unless the nature of the Inci~ent requires immediate action to be taken, the recipient will record and repeat each phrase as it is received and on completion o f the report the recipient shall read back the complete report to the sender who shall contir. that it is accurate; or

(c) if the requirement to take immediate action has meant that the confirmation of the report required by 01>6.·1 . 1 . 5 (b) hos not been obtained at the time the report was giVen, such confirmation must be sought from the sender by the recipient as soon as is reasonably possible.

Significant Incident Reporting

If, in EGAT's reasonable opinion, the Incident has caused, or could have caused, an Operational Bttect, or has caused, or could have caussd, serious injury to an individual, then EGAT aay classify the Incident as a Significant Incident. In such case BGAT may seek additional written reports from the User reporting the Incident or, where the primary cause of the Incident was within the Transmie8ioD System, EGAT will prepare such a report itself. Such a report will contain det~ils of the initial report given of the Incident and such other information as EGAT reasonably considers is necessary and haa so informed the producer of the report.

A report produced pursuant to OP6.4.2 . l shall be classed as a 8ign1ticant Incident Report and shall be produced and issued to EGAT as soon as is reasonabl y practical. EGAT will issue copies ot any such report to any User who, in EGAT's reasonable opinion, has been, Or CQuid have been, affected by the IDcident.

Significant Ineid.nt meeting

Where a Significant Incident Raport has been produced and issued, the issuer or any recipient of

OP6 - 5

\

OPS Icontinued)

OP6.4.3.2

OP6.4.).)

OPS.S

OP6.S.l

that report may, if it believes that it is necessary, request EGAT, in writing, to convene a meeting or all interested parties to discuss the I ncident (which request EGAT shall not unreasonably refuse) .

Where there have been a series at Significant Incidents and the party reques t ing the meeting under OP6.4.3.1 believes that they may be connected, that party may request that the meeting considers all such Significant Incidents.

Where it has been agreed that a meeting will be convened to discuss one or more Significant Incident s, EGAT will COnVene SUch a meeting as soon as reasonably practicable. All affected Users will be invited to send a representative to the meeting, which EGAT will Cha ir. The procedures and rules o! conduct of the meeting will be decided by the attendees.

User s shell treat all intormation r e ceived under this OPt as confidential and shall only release this information to third parties:

CaJ Where required to do so under any provision o! the Grid Co dei

(bJ where:

(i) a contr act between the User and the third party requires such disclosure; and

(ii)

( iii)

the third party is connected to the syst •• only via some facility owned by the U •• r and Which is itsol! conn .. c t .. d to, Or i .. par:-t or, Lhe syst •• ; and

had the third party been connected directly to the System, it would have received the information in its. own right.

(c) where required to do so under any law or statute;

OP6 - 6

OP' (continued) , ,d, where the inrormation has entered the public domain other than by this User broaching the conditions of this OP6.5.1.

OP6-7

01'7 - SAFETY LIAISON

01'7.1

OP7.1.1

OP7.1.2

01'7.1.3

01'7 • 2

01'7.3

01'7.3.1

OP7.3.1.1

iNTRODlICTION

Operating Procedure 01'7 specities the procedures to be used by EGAT and Oaera for the establishment and maintenance of switching and clearance p r ocedures to ensure that work on HV Apparatu~ in EGAT', or a user's Systems can be c<lrried out safely. It applies only When work and/or testing (other than system Tests covered by 01'5) is to be carried out and where the satety of personnel or plant requires EGAT and a User (or users) to liaise .

This 01'7 does not detine the s<lfety rules to be adopted by EGAT or any user but simply lays down the preparation of procedures which will govern the interface between them. In part i cular i t lays down the. rules for agreeing the safety procedures (the Local Safety procedures) which will be adopted on either side of a connection point between BOAT and any user.

Where the p r ovisi ons of this 01'7 require a Party t o approve the Local Safety Procedur es of another party, such approval does not imply that the approving Party takes any responsibility for the adequacy or otherwise of the Local Safety Procedur e. The approval in such case only implies that there is nothing in the Local Safety procedures that negates or frustrates any provision of the Local Safety procedure. of the approving Party for the relevant connection Point.

OSJECTIVE

The objective of this OP7 is to ensure that the safety proceaures adopted on ei ther side of a connection Point work together in such a way as t o ensure the safety of personnel ana/or plant at any time that work and/or testinq is carried out at or near the connection point.

CO-ORDINATION or SAFETY PROCEDURES

Approval of Local Safety procedures

Prior to the energising of a new connection Point (or, for a Connection Point which has been energised before the procedure laid down in this OP7 has been adopted, as soon as reasonably practicable), EG~T and the relevant User will each supply the other with a copy at the Local Safety procedures which it intends to adopt on

OP7 - 1

OP7 (eontinu.dj

OP7.3.1.2

OP7 .3.1. 3

OP7.J.l.4

OP7.3.1.5

OP7.4

OP7.4.1

its side of the Conneetion Point.

The Party from whom approval is sought will, within 7 days ot receipt of the Loeal Satety Proeedure, send written comments to the issuing Party giving:

fa) its approval of the Local satety procedure; or

(b) its reasona for refusing to give approval and the changes which it would wish to see to enable it to grant approval .

If the Party trom whom approval 1s sought requires more stringent Isolation and lor Eartbin9 provisions then, to the extent that these provisions are not unreasonable, then the other Party will make such changes to its Loeal Safety Procedures as soon as is reasonably practicable.

If, subsequent to the approval of any Loe.l Safety Proeedura, the issuing party wiahes to change any provision of the procedure, it will prepare a version at the procedure showing the origina l text and c learly indicating the changes required to this text and will seek approval of this procedure as if this procedura had not previously been approved. Subject to the provisions of OP7.3.l.S the revised procedure shall not be implemented until the necessary approvals have been received.

If an approved Loeal Safety Procedure has been found to be unsound, revisions to this procedure (only to the extent that these are required to ensure the safety ot personnel or plant) may be implemented i mmediately , subject only to the Safety co-ordinators of the other Party or Parties having been informed of those changes and having confirmed that the changes do not increase the risk to their own personnel or plant and are understood .

SAFETY CO-ORDINATORS

Prior to the energ1sing ot a new connection Point (or, tor a Connection Point which has been energised before the procedure la1d down in this OP7 has been adopted, as soon as reasonably practicable), EGAT and the relevant user will, in respect of this Conneetion point, each appoint an individual to act as Safety Co-ordinator and a second individual to act as safety Co - ordinator

OP7 - 2

I CPS - CONTINGENCY PLANNING

CPS.1

OPS.!.1

OPS.1.2

OP8.1.2

OPS.1.2. 1

OPS.1.2.2

OP8.2

OPS.2.1

INTRODUCTION

Operating Pro~edure CPS defines the Procedures to be followed in the event ot an exceptionally serious breakdown on the system. It covers:

(a) priority Load Shedding and Load restoration; and

(b) Generator Shedding;

(0) Black start .

The Procedures to be followed by Generators in support of System Frequency are covered in SDP3.

System Emergency Action Sheets

Whilst this OPS lays down the basic rules for Load Shedding, Generator Shedding and Black Start, additional details are given in the appropriate System Emergency Action Sheets which shall be i ssue d from time to time by BOAT to Authorised operators.

The following details are set out in the appropriate system Emergency ~ction Sheets:

(a) details of all Load Shedding B~ocks;

(b) re~evant telephone numbers and means of communication between the relevant Parties (as laid down in OP6);

(e) action to he taken following a loSS of communications (as laid down in OP6);

(d) Generation and special Procedures where appropriate.

OBJECTrvES

The objectives of this OPS are:

(a) to ensure that rules are established which al'low independent action by appropriate Authorised Operators to avoid a complete breakdo .... n of the System; and

(b) to describe the Procedures to be followed to restore the system following a Under Prequency Emergency, partial Shutdown or Total Shutdown;

OPS - 1

OP8 (continued)

OP8.)

OPS . l.l

OPS.3.2

OPB.J.J

OP8 . J.4

OPS.4

OPS.4.1

OPS . 4 .1. 1

OPS . 4 . 1.2

OPS . 4.1.3

(c) to install the protection system to avoid cascade tripping .

SYSTEM EMERGENCIES

A Vnder Frequency z.ergency shall occur when the By.tea Frequency falls non-transiently to or below 49Hz.

A Partial Shutdcwn occurs when a section of the System becomes dis connected from the remainder at the System, forming a Power Island.

A Total ShuLdown u~~urs when all Generation has ceased and there is no electr icity supply from External rnterconnections.

Ouring a under Prequency Emergency, Partial 8hutdown or Total Shutdown and the period following such an OCCUrrence during the restoration of the system, the System may be operated outside of System Frequency a nd system Voltage standards and the Scheduling a nd Dispatch of Generating Onits in accordance with the Merit Order may ceaSe.

LOAD SHEDDING

Load Shedding Blocks

Arrangements shall be made whereby , in a System Emergency, Load can be shed in Load Shedding Blocks. The Load Shedd ing Blocks for each individUal location Shall be allocated, where appr opriate, betwsen Under Prequenoy Automatic Load Shedding and Manual Load Sheddinq.

Under Prequency Auto~atic Load Sheddinq shall be effected by the operation of Onder Pre quency Relays, installed at appropriate points throughout the system. The settings at the Under Frequency Relays and their locations shnl l be detailed on the appropriate system Emergency Action Sheets.

The settings on the Under Frequency Relays shall al l ow for Load 8bedding i n steps at the following Frequencies and according to EGAT's Instruction:

Step 1 49. 0 BZ Step 2 48.8Hz Step 3 48.6Hz Step 4 48.3H~

Step 5 47.9H~.

0P8 - ,

(

OP7 (continued)

OP7.4.2

OP7.4.3

OP7 . 5

OP7.S.1

OP7.S.2

OP7.S.2.1

OP7 . S.2.2

at any time t ha t the first named individual is unavailable.

EGAT and the relevant User will each inform the other, in writing and without delay, of the identity of the individuals appointed by the m as Satety Co-ordinators. In the event of an intention to replace the individual appointed as Safety Co-ordinator the other Party to the connection point will be notified of identity of t he new safety co-ordinator without delay.

The safety co-ordinators will be responsible for co-ordination of all matters concerning safety across the Connection Point, including (but not limited to) the approval of Local Safety Procedures. A Satety Co- ordinator may be res pons ible for mo r e than one connection Point site.

ISOLATION AND EARTHING

Without prejudice to the need t o prepare and agree Local Safety Procedures for u~e at each connection Point site, it would be expected that the Isolation and Earthing principles no less s tringent than those out lined in OP7 . S.2 below will be adopted.

Isolation and Earthing principles

< ., Where Iso1ation is achieved by means of an Isol ation Device, the isolating position will be maint ained in such a way as to minimise the risk of inadvertent, accidental or unauthorised operation and that when put in this position, a notice or "tag" to this effect will be a ttached.

(b) Clearance to work on any Apparatus which requires this I solation to be achieved will only Ile issued when the pro<.:e<1un, in OP7.S.2.1 (a) has been completed .

( .,

'"

Where Earthi ng is achieved by means of an Earthing Device, the Earthing position wi ll be mainta ined in such a way as to minimise the risk of inadvertent, accidental or unaut horised operation and that when put in this p osi tion, a notice or " tag" to t his effect will be attached .

Clearance to work on any Apparatus which requires this Earthing t o be achieved

OP7 - J

• .

~ - LdO

'pa~aldwo~ uaaq se~ (v) Z'Z'~'LdO uT a~np8~o~d a~~ Ua~M pans Sr aq ~lUO 111M

(panUl~uooJ LdO

•

01'8 (continued)

OP8.4.1.4 The instructions to be followed to effect Kanual Load Shedding shall be detai led on the appropriate Systam Emergency Action Shaats.

01'8.4.1.5 I n certain circumstances Load Shedding by stages, normally Instruot.d by EGAT may not be adequate fcr relieving dangerous System conditions. In these circumstanoes, BOAT may Instruot Load Shedding at any Prequency and, for this purpose, Shall use the System Eaerqency Action Shests as a guide to priority.

OP8.4.2 Load Restoration

01'8.4.2.1 As soon as Frltquanc:y has risen to the value specified in the appropriate System Emergsncy Action Shaat, the Dispatcher shall start restoring Load, through the normal operational channels (as specified in 01'6) .

OP8.5 AUTOMATIC GENERATI:ON SHEDDI NG

01'8.5.1 EGAT uses N-l design criteria f or planning and operation. In sOme circumstances where N-2 happened which may cause cascade tripping on generating units, transmission lines or even system seperation. To prevent the serious problem after N- 2 incident EGAT preserve the right to install the protection system such as ~utoaatic Generation Shedding if it is necessary.

OP8.6 BLACK START

OPS.6.t Certain power Plant. are registered under Connection Conditions cc a s having the capability of starting without any external electricity supply ("Black Start Capability").

OPS.6.2 In the eVent of a Total or Partial Shutdown Generator, with Pover Plants regis tared as having a Black Start Capability may be Instructed by EGAT to perform a Black start. rn giving this InstrUction , EOAT Qay give to the Generator such other InstrUction' as, in its reasonable opinion, are necessary to accomplish a restoration of the System. In such a case, a Generator may not refuse such Instructions, even when they require operation of the Generating Unit outside of its current Operating Characteristics, other than for reasons of safety, ot either personnel or Plant.

OPS - 3

-

OPB (continued)

QPS.6 .J Upon receiving an Instruction to perform a Black Start, the Generator shall initiate the Start-Up as soon as possible and shall inform EGAT when th is has been accomplished . Following such confirmation EGAT will endeavour to stabilise the operation of the Generatinq unit by the establishment of appropriate loads and the Start­Up and Synchronis~tion ot other Ganeratinq units. If during this restorat ion period any Generator experiences difficulties in maintaining the operation of any o f its Genar~tinq Units within safe operating limits, it shall inform EGAT of this fact without delay and EGAT will, where possible, take such actions as are necessary to alleviate the problem.

OPS - 4

SOPI - GENERATION SCHEDULING

SOP1.l

SDPl.l.l

SDPl.l.2

SDP!.I.)

SDPI.I . 4

SDPl.2

SDPI.2.1

INTRODUCTION

Scheduling and Dispatcb Procedure SDPl set out the Procedure for the production of the Weekly Operating Program and the Daily Generation Program. It covers :

(a) the submission to EGAT by the Generators of an Availability Declaration and info~ation on their current Operating Characteristics;

(b) the submission to EGAT by the Externally Interconnected Parties of information concerning the available Capacity of t he External Interconnectors;

(c) the agreement between BGAT and the Ext ernally Interconnected Parties concerning Imports and Exports across the External Interconnectors; and

(d) the production and issue of the Weekly operating program and the Daily Generation Program by EGAT.

Where, in accordance with SOP!, information must be submitted or issued on a particular day and that day is not a Business Day, the intormation Shall be submitted or issued on such other day as EGAT shall have informed the User or Users, in writing, not less than 7 days prior to this revised day.

In this SOPl, other than in Appendix I, the term operating Characteristics includes all operating Characteristics other than capacity (which is in all cases treated separately).

The obligation in this SDPl to take account of irrigation requirements and reservoir levels refers only to such matters within Thailand.

OBJECTrVe

This Procedure SDPl is intended to enable EGAT to ensure that it receives SUfficient information, in a timely manner, to allow for the production of optimal Operating Programs tor 1 week ahead and 1 day ahead, taking account of:

(a) Generatinq Unit availabilities and

SOPl - 1

I

SDPl (continue~l

SDPl.)

SDPl.l.1

SDPl.. J. 2

SDPI. 3.3

Operating Characteristics;

(b) Imports across Externa~ lnterconnectors;

(e) Demand Forecasts;

(d) System economics;

(e) Pumped Storage Plant pumping conditions. Pumped storage plant means the pumping programme required for the Pumped storage plant s.

(tl Irr ig~tion requirements, environmental restrict ions and fuel supply restrictions;

."' (g) any constraints on the Transmission syatem.

WEEKLY OPERATING PROGRAM

The Weekly Operating Program is prepared on a calendar week basis and is based upon the relevant week o f the Monthly Operating Program. It will show the following:

(al a statement of expected daily pover Plant pro'duction, Imports and Demand;

(b) a Generation, External Intereonneetor and Transmission System outage program, prepared in accordance with OP2; and

(c) daily reservoir operation, including Pumped storage Plant pumping conditions, and irrigation requirements .

The Weekly Operating Program shall be prepared by EGAT in accordance with the rules laid down below.

Between 1000-1200 hours on each Wednesday, each Generator shall submit to EGAT by facsimile (or by s uch other means as have been agreed by EGAT) the following information, in respect at. each at. their Generating units and for the next following calendar week, the following information:

(a) an Availability Declaration stating the capacity at which t he Generating Unit may be operated in any time period (given in a

SDPl - 2

SDPl (continued)

whole number of MW) and the start and finish times f or each such time period;

(b) for any Generatinq unit which has been declared as Available and tor which any Operatinq Characteristic (as listed in Appendix I to this SDP1) has a value Which is different from the value o f the equivalent Registered Operating Char acteristic or has a value which is different from that declared by the Generator in its previous Declaration made under this SDPl.3.3, the Generator shall give the following:

(i) identificati on of the Operating Charact eristic (as shown in Appendix 1 to this SDP1);

(ii) the new value of the operating Characteristic;

(iii) the time from whe n this naw value will apply; and

(iv) the time tor whiCh the new value is expected to apply;

(c) In the event of no Declaration being made in respec t of an Operating Characteristic, EGAT shall assume that the last valid Declaration for this Operating Characteristic shall apply, or, if no previous val id Declaration has been made, that the va lue of the Registered operating characteristic shall apply;

(d) any r estrictions on operation which may arise from environmental considerations.

Betw~en 1000-1200 hour~ on each WadnQ~day, e ach Externally Interconnected Party shall submit to EGAT by facsimile (or by SUch other means as have been agreed by EGAT) the following information, in respect of each of their External Interconnectors and for the next following calendar week, the following information:

(a) requested, expected or agreed (as appropriate) Imports and Exports;

SOP1 - J

SOPl (continued)

SDPl. 3.5

(b) a Declaration stating the Capacity available at any time; and

(c) In the e vent ot no Declaration having been made in respect ot an _EZternal Interconnector, EGAT shall make an estimate at the values and restrictions which will apply;

(d) any restrictions on operation which may arise tram environmental or other considerations.

By 1600 hours on the Friday or the last working day at the week bet ore the stat"t at the WOlilk to which the Weekly operating Program will refer, EGAT will:

(al obt ain the relevant Dea&nd Forec.sts in accordance with OP1;

(b) produce a dratt ot the eXpecte d Generation, External Interconnector and Transmission xaintenanee schedule for the week in accordance with OP2;

ee) determine irrigation demand, in respect ot Hydro pover Plants tor each day at the week tram historic and climatic data and through discussions with the Royal Irrigation Department;

(d) forecast reservoir levels for each day at the wee k from considerations ot, amongst other things, historic and climatic data and expected irrigation requirements;

(e) optimise, as far as is practicable, the parallel operation ot Hydro and Thermal Power Plants and I.ports and Pumped storage Plant pu~ping requirements, taking account of:

( i)

(it)

(iii)

irrigation requirements;

Generating unit Availebility Declazations and Operatinq CharaClteriatics;

Operatinq Re.erve requirements

SOPl - 4

(

SOPl.J.6

80P!.4

SOP1.4.1

(lv) tuel and environmental restrictions; and

(v) information from the Externally Int.rcoDD.ct.~ Parties;

(tl establish. Merit Order of all Generating units as defined in SDPl.6 helow.

(9) determine the total System costa, including the costa of Generation and I _porta, the costs of restrictions resulting from Generation, EKtarnal IntercODnector and Transmission system outaga. and the costs of out-of-Merit Operation of Thermal power Plants and the costs of pumping tor PUmped storage plant;

(hJ Subject to the provisions of SOP1.3 . 6, prepare the Weekly operating proqraa end issue it internally within EGAT and to each aenerator and Externally Interconnected Party .

In the event that, in BGAT's reasonable opinion, the rlexibility ot operation or the Gene~ating units (as demonst~ated by their then current O.cla~ed Ope~atinq Characteristics) is such that the Scheduling of 6urticient operating R ••• ~v. is not possible, then EGAT may take the actions envisaged under SDP3.J .J. 5 and the results of such actions will be reflected in the weekly operating Progra..

DAZLY GENERATION PROGRAM

The Daily Generation P~ogram is prepared on a daily basis and is based upon the relevant day o f the weekly Ope~atinq Progra.. I t will show the following:

(0) a stdL~m.nt of hourly plant production and Demand;

(b) a Generation, External lnt.rconneetor and Transmission System Outage program, prepared in accordance with OP2; and

(e) hourly reservoir operation, including Pumped storage Plant pu~ping conditions,

SDPl - 5

SOPl (continued)

SDP1 . 4.2

SDP1 . 4.3

and irrigation requirements.

The Daily Ganaration Proqram shall be prepared by BGAT in accordance with the rules laid down below.

Between 1000-1200 hour& on each day, each Genarator shall SUbmit to EOAT by ~acsimile (or by such other means as have been a greed by EOAT) the ~ollowing information, in respect of each o~ their Ganarating Unita and for the next following day, the following information:

(a ) an availability Dec1aratioD stating the Capacity at which the Generating Unit may be operated in any time period (given in a whole number of HW) and the start and finish times tor each such time period;

(b) tor any Generating Unit which has been declared •• Avail~le and tor which any operating Characteristic Cas listed in Appendix 1 to this SOPl) has a value Which is different from the value of the equivalent Registered Operating characteri.tic or has a value Which is different from that declared by the Generator in its previous Declaration made under this SDP1.4.3, (s~ve that no revisions to any Bconoaic Operating characteristic wil l be accepted) the oenerator $h~ll give t he following:

(el

(il

(ii)

(iii)

identification of the opereting Characteristic (as shown in Appendix 1 to this SDP1);

the new value of the Operating Characteristic;

the time from when this new value will apply; and

(iv) the time for which the new value is eXpGcted to apply;

In the event of no Declaration being .ade in respect ot an Operating Chareoteri.tic, EGAT shall assume that the last valid Declaration for this Operating Characteriatic shall apply, or, if no

SDPt - 6

SDPl (continued)

SOPl.4.4

SOP1.4.5

previous valid Declaration has been made, that the value or the Registered Opereting Characteri.tic shall apply;

(d) any restrictions On operation which may ariae froft environmental considerationa.

Between 1000-1200 hours On each day, each EXternally Interconnected Party shall submit to EGAT hy facsimile (or by such other means as have been agreed by EGAT) in respect of each of their External Interconnectora and for the next following day, the following information (save that no revisions to any Economic Operating Characteristic will be accepted) :

(al requested , expected aT agreed (~S appropriate) Imports and Exports;

(b) a Declaration stating the capacity available at any time, and

(e) In the event of no Daclaration having been made in respect of an EXternal Intercoonector, EGAT Shall make an estimate of the values and r estrictions which will apply,

(d) any restrictions on operation Which may arise from environmental or other considerations.

By 1600 hours on the day before the start of the day to which the Daily Oeneration Proqram will refer, ZGAT will:

(al obtain the relevant Oe .. od Porecasts in accordance with OPl,

(b) produce a draft of the expected Generation, EKterftal Intaroonneotor and Tron •• ission Maintenance Schedule tor the day in accordance with OP2,

(c) determine irrigation demand, in respect Of Hydro Power P l ants located within Thailand, for each hour of the day from historic and clieatic data and through discussions with the Ministry of Agriculture and the Royal I r rigation Department;

SDPl - 7

SOP! (continue~l

SOPI. 4.6

(d) torecast r eservoir levels (for reservoirs located within Thailand) tor each hour at the day from considerations of, amongst other things, historic and c limatic data and expected irrigation requirements;

(e) optimise, a~ far as is practicable, the parallel operation of Hy~ro and Thermal Power Planta and l~ports and Pumped storage Plant pumping requirements, taking account of:

Ii)

(ii)

(iii)

(iv)

(v)

irrigation requirements;

Generating Unit Availability Declarations and Operating Cha racteriatics;

Operating Reserve requirements

tuel and environmental restrictions ; and

information from the EZternally Interconnected parties;

(fl e s t abl i sh a Herit Order at a ll Generating Units as defined in SDPl.6 below.

(g) dete~ine the t otal System costs, including the costs ot Generation, the costs of restrictions r e sulting from Generetion and Trens.ission System Outage. and the costs of Out-of- Xerit operation of Ther •• l Paver Planta; and

(h) Subject to the provisions ot SOP1.4.6, prepare the Daily Operating Program and issue it internally within EGAT and to each Generator and E.te~n.lly Interconnected Pa~ty.

In the event that, in EGAT ' B reasonable cp~n~on, the tlexibility ot operation of the Gene~ating units (as demonstrated by their then current Declared ope~atin9 Cbaracteristics ) is such that the Scheduling ot SUf f icient Operatinq Reserve is not possibl e, then EGAT may take the actions envisaged under SOP3.3.J.5 and the results of such actions will be reflected in t he Daily operatinq

SDPI - 8

SDPl (continued)

Pl:oqram.

SDPlo 5 REVISIONS TO AVAILABILITY AND OPERATING CH~RACTERISTICS

SDP1.5.l If at any time a Generatol: or externally Interconnected party finds that, in respect of any of its Generatinq unit a or , as the case may be, EXternal Int_reonneetora, any part of the last Declaration made u~der SOPl.4.3 or SDP 1.4.4 or this SDPlo5.1 is no lonqer valid, it shall inform EOAT of this fact and the revised value or values (and the times fo r which they shall apply) without delay, by Control Te l epbony or such other means as BGAT miqht from time to time aqree, and Shall confirm the same i~ writinq within [1) hour (save that nO rovisions to any Sconomio opoJ:atinq Chataoteriatie wil l be accepted) .

SDPl.6 HERIT ORDER

SOPl.6.1 Thermal power Plaut Herit Or der

SDPlo6.lol BGAT will calculate a position in the TheI'lllIll. Power Plant Merit Or der for each TheI'lllal Generatinq Onit. A Generatinq vuit's position in the Kerit Order is based upon its operat inq cost per KWh of electricity sent out, as determined in accordance with SDP1.6.1.3 and SDP1.6.1.4 and the effect ot transmission losses from that unit t o the l.oad centre.

SDP1.6.1.2 It is important that the Harit Order be updated frequently to take account of changes to the value of the Economic Operatinq ChaJ:acteristics submitted in respect o f the Generatinq Onits pursuant to this SP01. EGAT will, therefore, update the KeJ:it order liS frequently a5, in its reasonable opinion, is required and, in any case, as part of the process of pr.,parinq .,,,0.;11 .eekly operatinq ProqraJlli.

SOP1.6.I . J Where in respect Of a Generatinq vuit the Economic Operating Charaeter is ite. are submitted in terms of tuel type and energy requirements (as laid down in SDP IAl.2.2.3) the operatinq C05t (per KWh s ent out) of each aanaratin9 Unit will be calculated as follows (each value being that related to the

SDPl - 9

SOP1 (continued)

Generating unit in question):

Let:

Ca) The cost ot tuel, in Baht/unit quantity, • F;

(b) The caloritic value of the fuel, in GJ/unit queantity - C;

fc) The aeat Rate ot the Generating Unit at full load, in OJ/hour = H;

Cd) The tull load capability of the unit, in KW - H;

opcri:lting cost (Baht per KWh) = «F/e) * II) /~I

SPDl . 6.1.4 Where, in respect ot a Generating Unit, the EconoDic Operating Characteristics arc sub~i tted in terms of tuel type and energy requirement (as laid down in SPDIAl.2.2.4), the operating cost (per KWh sent out) of each Generating Unit wil l b. calculated as follows (each value being that releated to the Generating Unit in question):

Let:

Ca) The No-load price, in Baht/hour, - Ni

(b) The incremental price, in Baht/KWh, - P;

fc) The capacity, in n, - C;

Operating cost (in Baht/KWh) = (N/C) + P

SDPl.6.2 Hydro Pover Plant Xerit OroSer

SOPl .6. 2.1 Tho effic iency of a Hydro turbine is affected by, amongst other things, the Turbine Head and the Active ana Reactive Pover output. In the setting of the Hydro Power Plant Merit Order EG~T will prepare, for each Hydro Power Plant and, as appropriate, for each Hydro Generating Unit within the Power Plant, a loading chart , a reservoir characteristic curve and a discharge curve. These will be used to shOW the relationship between ef ticiency and output over a range of Turbine Head values which can occur due to tluctuations in water storage an~ tailrace levels. A further factor to

SDPl - 10

SDP1 (cQntin~ed)

be taken account of in setting the HydJ:o Pover Plant Herit Order is the downstream irrigation req~ircment$.

SOPl - 11

SDPl - APPENDIX 1

SDPlAl.l INTRODUCTION

SOPlAl.l. 1 Each Generator ..,ill make Declarations in accordance with this SOPl at the values of the Operating characteristics listed in SOPlAl.2 in respect of each of its Generat ing Units (which value shall reflect the true operating character istics at the Generating unit, deter.ined in accordance with Pru~ant Practice).

SDPlAl. 1. 2 In respect ot any Hydro Ganerating unit, warmth­varying values ot Oparating Charact a ri,tics have no meaning and only the "cold " value at the Oparat ing Charactaristic shall be given.

SOPIAl.I. ) In respect ot PUmped storage Plants, the capabilit y ot pumping will be classed as an Operating charaotari.tic and, as required the term Generating unit will be applied, to the extent requ ired , t o a pump in such a plant.

SOPIAl. l. 4 In respect of any The~a1 Ganarating Unit the Generator shall notity EGAT or the detinitions ot Warmth Condition which shall apply t o a ll Warmth­varying Oparating characteristics and whiCh were submitted by th~ Generator pursuant to the Connection Conditions, ce. The notitication ot those Warmth conditions wi ll be as laid down i n SDP1Al.2.l and may only be changed with EGAT'e written permission.

SOP1Al.l. 5 Each Externally Interconnected Party will make Decl'rations in a ccordance with this SDPl of the capability or each ot its Eatarnal Intarconnaetore to Import or EXpor t electricity or prov ide Raserve (which values shall reflect the true operating Characte r istics of the Eata rnal Inta rconna ctor, determined in accordance with Pruda nt Practice), the expected or required 1mports and Exporta and the I.port price of electricity as qiven in SDP1A l .1 .

SOPlAl.2 GENERATOR DECLARATIONS

SDP1A1.2.l .armth Conditions

SOPlAl .2.l.l " cold- and "hot" condit ions

Condition Time since last De-Synchronised

SOP1 Al - 1

SDP1 - ~PPENDII 1 (continued)

cold more than [ 1 hours

hot less t han [ 1 hours

SDPl.Al. 2: .1. 2 "warm" condition

Warm - not hot or cold

SDP1~1.2.2 Operating Characteristics

SDPIAl.2.2.1 The first set of operating Characteristics COnCern t he output of the Generating Unit and its ability to change its output l evel of active or reactive power and, in the case of Pumped storage Plant only, its ability to pump water from the lower to the upper reservoir.

(a) Capacity. The achievable power output of the Generating Unit, given in KW, and net of any power used solely to drive Apparatus dedicated to this particular Generating Unit and any power output aChievable as MaKimum Generation.

(b) Minimum Generation. The minimum output leve l, given in KW, which a Generating Unit can safely maintain for an indef inite period.

[c) Maximum GeneratiOD. The level of power output above the declared capacity, given in MW, which is sustainable for only short periods of time.

(d) Reactive Power capability. The levels of Reactive Pover, bot h l e ading and lagging, deliverable at specified output levels. Reactive Pover = V * I * sinp, where p is the phase angl e .

(0) spinning Rasarve '''''p"bility. The ability of the Generating Unit, when part-loaded, to increase its output under governor control in certain time scales.

(fl Notice to Synchronise. The period of time, given in hours, required between the notification to the Generator that it is required to Start-Dp the Generating Unit and the earliest time the Generating

SDPIAI - 2

,

SDP1 - APPENDIX 1 (cont inued)

'h'

( i)

- O( j )

Unit can be Synchronised in the fol lowing Warmth Conditions: Cold (with boiler cold), cold (with boiler on Hot Standby), warm and hot.

Block Load on Synchronisation. The instantaneouB output l evel , in MW, which the Gemerating Unit wi ll attain on Sytlcbroni.ation. !lot, warm and cold values may be give n.

Loading Rate. The maximum rate at which the Generating Unit, when synchron ised, can increase output under op.~ator contr ol and in normal operating conditions. GiVen in "/min for diffe~ent output levels and different Warmth Conditions.

Da-Loading Rate. The maximum rate at whiCh the Generating Unit, when synchronised, c an decrease output under ope~atbr control and in normal operating conditions. Given in KW,min for different output levels and ditferent Warmth Condition •.

Minimua Up-Time. hou~s, f or which be. synchronised.

The minimum time, in the Generating onit must

(k) Minimum Down-Time. The minimum time, in hou~s, for which t he Generatinq onit must be De-Synchronised.

(1) Maximum fuel changes. The maximum number of f u el changes that a Generating unit can be requ ired t o do in a 24 hour pe riod .

(m) Turbino hood. (For all ~ydro Po.er Plants) the expect ed Turbine Haad. Where a ppropr i ate thi s may be given o n a Power Plant basis.

(n) River flow rate . (For run- ot-river Hydro Po.er Plant only) the expected flow rate ot the river (i n ml per hour). Where appropriate this may be given on a pover Plant basis.

SDPIAl - 3

SDPl - ~PPENDIX 1 (con~inue~)

(0) Res ervoir capacity. (For reservoir Hy~ro pover Plan~., including Pumpa~ S~oraqa Plan~, only) the volume of water currently held in the r e servoir .

(p) Pumping capability. (For Puape~ s~orage Plant only ) the Volume of water which CAn be pumped (in m' per hour). Where appropriate this may be given on a Pover Plllll~ basis.

(q) pumping availability. (For pumpe~ B~orage Plant only) the times during which the pumps are available to pump water and the KW levels o~ power required. Where appropriate this .ay be given on a Pover Plant basis .

SDPIA l .2.2.2 The second sat of Oparating Characteristios concern the e conomic s of operation ot the Generating unit. Subject to agreement, in writing, from EGAT (such agreement not to be unreasonably withheld), a Generator may SUbmit information about the economics of operation of its Generating unit in accordance with the provisions of either SDPIA1.2.2.l or SDPIA1.2 . 2.4. These Operating Characteri.tics are known as Economic operating Charaoteristics.

SOPlAl.2.2. l The ~irst option requires the Generator to provide the following intorm~tion tor e~ch of it. Generating Unit.:

(a) Fuel. A statement ot the type or types of tuel used by the Generatinq unit.

(b) specitic energy content of fuel . The number of GJ of energy in each standard unit (volume or Weight) of a tuel.

( c) lIt.art- tlp heat. ·l 'he energy, i n GJ/llta.rt­op, required to perform a Start-Up, cold (with boiler cold), cold (with boiler on HO~ standby), warm and hot conditions.

(d) No-load heat. The energy, in GJ/hour, required to keep the Gen.ra~ing UDit Syncbronised to the System, but at zero KW output.

SOP1Al - 4

- -

BDPl - APPENDIX 1 lcontinued)

(e) Incremental heat. The energy. in OJ/KWh, r equired to produce net output from the Genar"ting Unit.

If) St andby st"rt up heat. The energy, in GJ, required to bring the boiler from cold or warm to Ho t standby.

(g) Hot Standby hea~. The energy, in OJ/hour, required to maintain the boiler at Bot standby.

( h) Start 0 and H costs. Baht/Start-Op, of the and maintenance costs with !'I start-up.

The cost, in non-fual operation associated solely

(i) output 0 and M costs. The cost, in Baht/KWh, of the non-fuel operation and maintenance costs associated solely with producing power output.

(j) standby start up 0 and M costs. The cost, in Baht/start, of the non-fuel operation and maintenance costs associated solely with bringing a boiler to Hot Standby condition.

(k) Hot Standby 0 and H costs. The cost, in Baht/hour, of the non-fuel operation and maintenance costs associated solely with keeping a boiler at Hot Standby condition.

SOPlAl.2.2.4 The second option requires the Ganerator to provide the following infonlation for each of its Ganarating Units:

(a) A Btart-Up price. The price to Bt"rt-cp the Genarating Unit, in Baht/hour, cold (with boiler eold), cold (with boiler on aot standby), warm and hot conditions.

(0) A No-load price. The price. to maintain the Generating unit Synohronised to the System but producing no output, in Baht/hour.

(c) An incremental price. The price for each MWb of output, in Baht/KWh, and is

SDPIAl - 5

SDP1 - APPENDIX 1 (continue~)

SDPllU .3

(dJ

( oJ

ndditionBl to the no-load price.

A standby start price. Baht/start, to bring a or cold to Bot Standby

The price, boiler trolll condition.

A Hot standby price. Baht/hour, to keep a Standby.

Tho prico, in boiler at Hot

in .. ~

EXTERNALLY INTERCONNECTBD PARTY OECLARATIONS

The operatinq Charaoteri.tics, including the Econo.io operatinq Characteristic., of an Eztern.l Interconnector define its ability to Import or Export or provide Re.erv. or other services, the cost (or price) of Imports and the expected volume and tillling of I.port. and Export.. For any EXternal Int.rconnecter , BGAT will aqr ee with the EXternally Interconnected Party whnt operating Characteristic. should be inCluded in the Declarations required under thia SDP1.

SDP1Al - 6

----- !

SDP2 - GENERATION SCHBDULING

SDP2.1

SDPLl.l

SDP2.1 . 2

SDP2.1. 3

SDP2.2

SDP2.2.1

SDP2.]

SDP2.3.1

INTRODUCTION

Scbedul iD9 and Dispatch Procedure SDP2 is complementary to SDPl and SDP]. It sets out the Procedures for EGAT to:

(a) issue Dispatcb Instructions to Oenerators;

(b) give permission tor a Generator or Externltlly Interconnected. Party to take its Ganerating Unit or, as the case l1Iay be, its External Intarconnector, out on Planned. outaqe; and

(e) re-optimise the Daily Ganeration Program.

Dispatch Instructions concerning the Dispstch of Imports or Bxports or any ,other .services deliV4iIl·ed across an Ezternal Interconneotor will be agreed betWeen EOAT and the EZtarnally Interconnected party.

All Instructions shall be given in the Thai language .

OBJECTIVE

The objectiVe at this SDP2 is to enable, as tar as is possible , EGl'oT to match continuously Generation and Imports and Demand (together with an appropriate level or Re.erve) in an economic way, taking account at:

(a) the intentions expressed in the Daily Generati?n Program., including the requirements to reledse Oenerating units and EKtarn.l Intarconnactors Oil Planned Out.qa;

(b) the Merit Ordera as derived under SDP1;

(e) the preservat ion of the integrity of the System; and

(d) the Oparatinq Btan~ar4. to be adopt ed tor 8yst_ Prequency and Syst_ Voltage.

INFORHAT:ION TO BB USED

III making decisions on which Ganarating Units to

SDP2 - 1

SDP2 (continue!!)

SDP2 ...

SDP2.4.1

Dimp~tcb, on the Imports and Exports to init i ate li nd on the prudence o( releasing Generatinq Units and External IntercolIDectors (or Planned Outag.s , EGAT will take account of the following information to the extent that, in its reasonable opinion, is appropr iate:

(a) the Daily Ganeration Prograa, produced and issued in accordance with SDP1, for the day in question;

(b) the latest Availability Declaration or Declaration o( Operating Characteriltics made in respect of any Generating unit under SDPl.4.3 or SOPl.5.l;

(c) the oxpect ed capabilities of any External Interconneotora and Imports and EXports across them as declared by the Externally Zntercottnect.4 Parti.. to EOAT under SDP1.4.4 and SOPl.5.l;

Cd) the systam Frequency and system Voltage a s known to EGAT via the SCADA System; and

(e) any other such inf ormation as EGAT, in its reasonable opinion, considers to be relevant.

RELEASE OF GENERATI NG UNITS .OR PLANNED OUTAGE

Outage optimization model de t e r.ine the opti mal schedule based on:

(a) l evelhing reserves

fb) mini.izing production cost

SDP2.5 DISPATCH INSTRUCTIONS

SOI'2.S.1 :Issue ot Dispatch Instructions

SDP2 . 5 .1.1 Oispatch Instruetions relatinq to a particular day may be issued at any time during that day or, when operational reasons so dictate, at a ti~e betore the start of the day.

SDP2.S.l.2 Dispatch Instruction. will be issued by EGAT directly to tho Generator at the relevant pover Vlant and will i nclUde an exchange of opera tor

SDP2 - 2

SDP2 (continued)

nanes. They ~ill be issued by control Telephony or ( by such other means as has been aqreed between EGAT

and the Generator. Whenever possible, the Dispatch Instruction will be qiven in the form laid down in Appendix 1 to this SDP2.

I

SDP2.5.1.3 The receipt of a Dispetoh Instruction must be for.ally acknowledqed immediately by the Generator indicatinq the Genarator's acceptance or non­acceptanco of the Inetruotion. A Generator may only refuse to accept an lnatruction properly qiven by "tGAT:

Cal on the qrounds of safety of personnel or Planti or

(bl because the Instruction requires tha Generatinq unit to pertora outside of its capability as Declared under SDP1.4.3 or, as the case Day be, SDP1.5.1 and:

(i) EGAT has not stated that the Instruotion is issued under conditions of a System EaerqencYi or

(ii ) in respect of Instructions to operate at less than the current declared Capacity

when only the reason qiven in sOP2.5.1.3{a) is a Valid r eason for non- acceptance.

SOP2.S.1.4 In thB event that a aenerator experiances unforseen difficulties in carrying out the Inatruction, it shall inform EGAT of this fact without delay.

SOP2.S.1.5 In addition to Dispatch In~tructiona relatinq to the provision of Activa Pover, Dispatch Inatructions may include:

(s) Instructions to switch in or switch out control ot the Generatinq Unit by EG~T's ~GCi

(b) Instructions to act in support ot sy.tam Frequancy through the provision of aeserve;

{cj In~tructions to act in support of System Voltaqe throuqh the Generation or

SDP2 - 3

SDP2 (continued)

consUMption of Raactive power;

(d) notice snd changes of notice to Synchronise by a given time:

(e) InstrUctions to Synchronisa or Da­synchronise;

{fl InstructioDs relating to the energising or tap positions of a Generation ~raDsforasr:

(g) Instructions relating to the operation of any protection equipnent relating to the intarface between the Po.ar Plant and the Tranamiasion system;

(h) Instructions relati ng to th~ cperation of any control equipment relating to the interface between the Po.er Plant and the Transmission System; (where this duty has been given to the Generator through an agreement between the Ganerator and EGATl;

(i) Instructions to change fuel (where this right is conferred on EGAT through an agreement between EGAT and the Generator);

Cj) Instructions to a Generator with a Hydro Pover Plant to release water tor irri gation purposes;

Ck) For PUmpad Storage Plant only, Instructions to commence or to cease pumping .

SDP2 . 5.2 Action requirad trom Generators

SDP2.5.2.1 A Ganerator will comply with any Instruction properly given by EGAT without delay, other than when, in accordance with the provisions of SOP2.S.1.3 it has deCl ined to accept tha Instruction or when, under the provision of SDP2.5.1.4. it has registered a difficulty in complying with the Instruetion.

SDP2.5.2.2 Subject to the provisions of SDP2.5.2.1, a Generator will be required to achieve the following Dispatcb accuracies in the operation of its Generating units:

Cal Synchronised or De-synchroni.ad within ± 5

SDP2 - 4

(

SDP2 (continued)

SDP2.6

SDP2.6.1

minutes of the Target Tille.

(b) Where no specific Target T~e is given then, other than for a synchronisation or de- synchronisation Instruction, the output level to which it is Instructea will be achieved within ~ 2 minutes of the time it should have achieved if it changed output at its Loading, or, as the case may be, 0.­Loading Itate.

(c) Where a specific Target Tiae is given then, other than for a synchronisation or de­synchronisation Instruction, the output level to which it is Instruoted will be achieved within ~ 2 minutes of the Target 'rae.

Cd' Where Instruoted to a particular output level, that level should be achieved (subject to any necessary adjustments to take account of any differsnce between the Target Prequenoy and the system Frequenoy) with an accuracy of the greater of 1 HW or ± 2 ' of the capacity ot the aenerating Unit, as given in its Registered operating Character istics.

RE-OPTIMISATION OP THB DAILY GBNBRATION PROGRAK

EGA'l' will re-optimise the Daily aeDeration Prograa it, in its reasonable opinion, this is necessary. In carrying out are-optimisation EGAT will take account ot those tactors laid out in SDP1.4 and SDPl.5 as it reasonably considers are necessa ry.

SDP2 - 5

SDP2 - APPENDIX 1

SDP2A1.1

SDP2Al. 1. 1

SDP2Al . l . 2

SDP2JU.2

SDP;!:Al.2 . 1-

DISPATCH IHSTRUCTXOHS

Dispatch Xnst~uctions will normally be given in the following form:

(a) exchange of operator namesi

(b) identification of the specific Generating unit or, in the case of a pumping Instruction to a PuJIIpe<l Sto~.ge Plant, the identification of the spacific pump (if this is not the same as the identification of the relevant aanarating unit) to which the Instruction applies;

(c) the duty whiCh the Gene~atinq unit is to perform OJ:" the output level to Which it is instructed:

(d) the start time at which the aanarating unit is to start complying with the In.t~uotion (if this is different from the Instruotion issue time);

(e ) where necessary, II. Target Time by which the output level must be reached or the Instruction must be completed;

( f ) the issue time of t he In.truction.

Examples of tha main types of Instructions to be given are shown below. In each example it is assumed that the required exchange of names has taken place. An Instruction can have both II. start time and a Targat Ti.e, although not all possible combinations of these dates have been shown.

Instruction to change output 1evGI

In ..,,,en ..,xample th ... In .. t~ction is tor Unit :J to change output to 2000, with the In.truction given at 1300 hours:

(a) In this first version, the implementation of the Instruction starts immediately:

"Unit 3 to 2000, instruction timed at 1300 hOUT""

SOP2Al - 1

801'2 - APPENDIX 1 (cont.inued)

80P2Al.l

SOP2A1.3.1

SDP2Al. 3.2

(b) In this next version, the implementation of the Inst.ruct.ion starts in one hour:

"Unit 3 to 200n, start time 1400 hours, instruction timed at 1300 hours"

(c) Finally, the Instruct.ion is to Qchieve the Instruct.ed level by 1330 hours:

"Unit 3 to 200n at 1330 hours, instruction timed at 1300 hours"

Inst.ruct.ion to Syncbronise

In the case ot a Synchronise Instruction, it would be normal to issue a loading Instruction at the same time . It such a loadinq Instruotion is not included then the Ganerat.inq unit should be Synchronised and i~ediately loaded (in accordance with its current Loading Rates) to its Kinimum Ganaration level (at which point, the Generator will report to EOAT that it has achieved this level). In giving a syncbronisation Inst.ruction, EGAT shall always due regard tor the Not.ice to Synchronis. time given by the Generator and, tor this Instruction, will always give a Tarqat Time.

In the example below, unit 2 has bee n Inst.ructed to Syncbronise, with the Inst.ruct.ion issued at 0800 hours. The Hotice t.o Synohronise time for the Generator is 4 hours:

(a) In this f i rst example, the required synchronisation time is in line with the Notice to syncbronis. time:

"Unit 2 synchronise at 1200 hours, instruction ti~ed at 0800 hours"

(b) It tha requir~d synchronisation time is later than required by the Not.ic. to Synchronies time, the Instruotion ~ould be of the form:

"Unit 2 synchronise at 1400 hours, instruction timed at 0800 hcurs"

SDP2Al - 2

i

f

SDP2 - APPENDIZ 1 (contiDue~l

SDP2Al.4

SDP2AL4.1

SDP2l\1.4.2

SDP2Al . 5

SOP2Al.5.1

SOP2A1.5.2

SOP2Al.6

SDP2Al.6.1

rnstcuctiOD to De-Synchronise

In the case ot an Instruction to De-Synchronise, (or "Sbut4own") the required d .. -loading Instruction is assumed to be incLuded . In the case where the Generating unit is not required to i~.ediately de-load end come ott, a Target Time will be given.

In the examples below, Unit 1 is running at 60MY and has a Oe-Loa4inq Rate of 6MW/minute. It is given a de-synchronisation Instruction at 1100 hours. Based upon its De-LoBelinq ht. it can De­Synchroni •• by 1110 hours.

(a) If Unit 1 is required to De-Synchronise liS soon as possible, the Instruction is:

"unit 1 shutdown, instruction timed at 1100 hours"

(b) If, however, unit 1 is required to De­synchronise by 1200 hour$, the Instruction will be:

"Unit 1 shutdown at 1200 hours, instruction timed at 1100 hours n

Prequency control

Inatructiona to change the Targat Prequency by !GAT's National Control centre to units in AGC and for use by units to be switched in AGC. This can be controlled via the BCADA computer under the control of the National Control Centre.

Example instructions for switching in or out AGC;

·SB Unit 1 on AGe at 1200 hours, instruction timed at 0800. n

"SB Unit 1 off AGe at 1200 hours, instruction timed at 0800."

Instruction to provide operating Reserve

The Instruction to provide Operating Re.erve will normally be given as part ot a loading Instruction. An example would be:

SDP2Al - 3

SDP2 - APPENDIX 1 (continued)

BDP2Al.7

SOP2Al.7.1

"

" Unit 4 to 100KW and 10Kll Operating Re"arve, instruction timed at 1330 hours"

1 l1Dtr\lctioD to provide Volt&ga support

To provide voltag_ support to the Systam, EGAT may Instruct Ganerator s in a number ot ways .

. Unless the voltaga support Inatruction has with it an Active Pover loading Instruction, the Generator must maintain the Activa Pover output ot its Ganerating Unit at the eurrant Instructed level. Examples ot Voltage support Instructions are.;

'0' "unit 1 inerease Reaetive Pover output by 10MVAr, instruction timed at 1200 hours"

(b) ·Unit 2 maximum Reactive pover output, instrueti on timed at 1200 hours"

SOP2A1 - 4

SDP] - FREQUENCY A.~ VOLTAGE CONTROL

SDP].l INTRODUCTION

SDPJ.l.l Schedul inq and Diepatch Procedure SDPJ sets out the Procedure for EGAT to use to undertake the direction of Sy.t .. Frequency and voltaqa control and lays down the duties of the Oenarators in this respect.

SOP3.1.2 The maintenance of Sy.t .. Frequency and Vcltaga is a major factor in the Scheduling and Dispatch of Generation, covered in Schedulinq and Dispatcb procadure. SOP1 and 8DP2. This Procedura SOP] is therefore complementary to Procedure. SDP1 and 8DP2.

SDP3.1 . 3 During. Under Prequency e.argency, partial Shutdown , ~tal Shut4own, or High Fr4qUency e.erqancy and the period following such an occurrence during the restoration of the sy.tem, the systea may be operated outside of systea Prequency and Syetam Voltage standards and the Scheduling and Oiepatch of Oeneratinq units in accordance with the Merit Order may cease.

SDP].2 OBJECTIVE

SOPJ.2 .l The objective of SOP] is to l ay down the Procedure to enable EGA~ to maintain, as far as is reasonably poeaible, System Frequency and Voltage within the required operational limits.

SDPl.l SYSTEM .REQOENCY CONTROL

SDP].l.l aaeponeibilities

SDP3.l.l.l BOAT shall be responsible tor co-ordinating the Schedulinq of the operation of Ganerating Units ~nd I.ports and EXports acr oss the Bzternal Interconnsctors, in accordance with SDPl, and isauinq Dispatch Instructions, in accordance with SDP2, to control the Prequency of the BGAT System and shall ensure that, as far as is practicable, sufficient Op.ratinq ae •• rve as laid down in OP4, has been Scheduled and Dispatched.

SDPl.l.2 Automatic Frequency Control

SDPl.3.2.1 A System Praquency of 50Hz shall ~ maintained utilising the Automatio Frequancy Control Co=puter

SOP] - 1

,

SDP3 (continued)

System owned and operated by EGAT.

SDP3.3.2.2 Generators must allow their GeDerating units to operate under Automatic Frequency control at all times unless technical reasons preclude this mode ot operation (which f act must be reported to EGAT wi t hout delay, as l a id down in SDP1 and SDP2) or unless relieved ot this obligation by BOAT.

SDP3.3.3 £merganoy Action

SDP).J.).l It System Frequency falls, not transiently, to or below 49.25Hz and no specitic Despatch Instruction to the contrary is issued within 1 minute, then all Generators Shall allow the output ot their Synchronised Generating Units to increase under Free Governor Aotion (which i ncrease ~ust not be overridden other than for reasons ot safety, ot either personnel or Plant.

SOP) . J . ].2 It System Frequenoy rises, not transiently, to or above 50.75Kz and no specific Deepatch Instruction to the contrary is issued within 1 minute, then all Generators shall reduce the output of their synohronised Generating units, either manually or aut omatically, by a minimum of 2' o f Generating Unit output per 0.lH8 deviation from Target Sy9te~ Praquaney . At Systam Frequenei •• above 50.5 Hz, EGAT .. y declare a Higb Frequency System ~.rgenoy.

SDPJ .3.3. 3 SUch changes in output required in SOPJ.J.J.l and SDP J.3.3.2 shall be made without reterence to EGAT and shall be maintained until Syatea Frequency has returned to ~arget syst.. Frequency or the Genarator has received a revised Dispatch InstrUction under SDP2. In order to assist EGAT in its control ot system Frequency, EGAT shall be informed of the action taken dS 800n dS practicable, and in any event within 5 minutes, atter the change in System Frequency to the defined level.

SOP3 - 2

SOPJ (continued)

SOP3.3 . 3.4 During a High Prequency System Emergenoy Generating Unite may be Instructed to De-synchronise even if this breaches the requirements at their then current Dec1aration ot Minimum Op-~t.e and refusal ot such Instruction i. only allowed on the grounds of aatety to personnel or Plant.

SDP3.3.J.S It, in the preparation ot the Weeltly or Da.i1y aeneration Program, or during the Oiapatoh ot Generating Unita, the tlexibility ot operation of the Generating Unita (as demonstrated by their then current Oec1ared Operating Characteristica) is, in EOAT's reasonable opi nion, such that the Scheduling of sutticient Operatin'i! Reaerve is not possible , then BOAT will:

contact any oenerator in respect of any ot its Generating Unite for which the then current Declared operating Charaoteristios provide 1ess f l exibility ot operation than the Registered Operating Cbarectaristics and request that the Generator provides revised values where appropriate (and such revised values, to the extent that they are otfered shall tora the basis of such

I decision makinq on Schedu1ing and Dispatch as EGAT ia required to perror.J;

SOP]." SYSTEM TIME

SDP3.4.1 F,GJ\.T will endeavour ($0 far as it is able and it is reasonable so to do) to control Frequency by specifyinq changes in Tarqet Prequency and by the Diepatch ot Generatinq Onits so that System ~ime is within plus cr minus lO seconds ot standard Time.

SDP].5 SYSTEM VOLTAGE CONTROL

SDP3.5 . 1 On an J\..c. System it is necessary not only to meet the ~ctive Power requirements of the System, but also the Reactive Power requirements.

SOP].5.2 Responsibilities

50P3.5.2.1 EGAT will decide on the R"ctive Generation and ae.ctive Reserve capacity required and sha11 take account of such requirements in the Scheduling and

SDP3 - 3

SOP3 (continued)

Dispatch at Genlrating Units under SUFI and SDP2.

SDPJ.5 . 2.2 Generatora shall ensure that their Synchronised Oenerating Dnit. are operated to maintain the Voltage level and provide the Rlaotive Generation and Reaotive R8.e~e required by EGAT at all times unless technical reasons preclude this mode of operation (which fact must be reported to EGAT without delay, as laid down in 80Pl and SOP2) or unless relieved of this obligation by EGAT.

SDP3. 5.3 Baergenc), Action

SDP3.5.l.I To maintain stable conditions throughout the systam under Emergency Conditionl'l, Generatora will take the following actions in respect of their Synchronised Generating Units.

SDPl.5.l .2 In the event of a SUdden drop in System Voltage and a corresponding rise in Reactive Generation, o,nerators must ensure that the additional kVAR output ot their G,nerating unita must be maintained and they lIIust not reduce Pieid Current until so Instruct,d by BGAT under SOP2 other than tor reasons of safety, of either personnel or Plant. G'nerators must increase the ~ output of their Synchronis,d G'n,rating Onit. to the maxi~u. capability of the Unit when so 1nstruct,d by EGAT under SOP2.

SOP3 .5. 3.3 1n the event of a SUdden rise in System Voltage and a corresponding tall in a,activI O,neration, Generators must not take action to recover ~ output lost on their Gln,rating Onits and they must not increase pi,ld currant until so Instructed by EGAT under SDP2 other than for reasons of safety, of either personnel or Plant.

SOP) - 4

GCl GENERAL PROVISIONS

GC1.l

GC1.2

GC1 . 3

GC1.f

GC1.S

Gel.S.l

INTRODOCTION

Whilst each Procedure in the Grid Code contains the rules and provisions relating specifically to that Procedure, there are provisions which are ot more general application. These are covered in this Procedure OC1.

OBJECTIVES

The General ProvisiODs (Gel) are ot general application to all provisions of the Grid Code. Their objective is to ensur e, to the extent possible, that the various sections ot the Grid Cod. work toget her in practice and tor the benefit ot all Osers.

SCOPE

The General Provisions apply to gGAT and all Generators .

UNFORsBEN CIRCUMSTANCBS

If circumstances arise which the provisions ot the Grid Code have not toreseen, EOAT shall, to the extent reasonably practicable in the circumstances, consult promptly and in good faith all affected users in an eftort to reach agreement as to what should be done. If agreement between BGAT and those Users as to what should be done cannot be reached in the time available, EGAT shall deter.ine what is to be done. Wherever EOAT makes a determination, it shall be having regard, wherever possible , to the views expressed by Users and, in any event, to what is reasonable in all the circumstances. Each user shall comply with all instructions given to it by EGAT following such determination provided that the instructions are con~istQnt with thO thcn ourrent technical paraaeters of the particular User's System registered unde r the Grid Code . COAT shall promptly refer to all such untoreseen circumstances and any such determination to the Panel for consideration in accordance with G02.

DEROGATIONS

If a User finds that it ia, or will be, unable to comply with any provision of the Grid Code, then it

GCl - 1

GCl (continued)

GCl.S . 2

GCl.S.l

GCl . S .4

shall , without delay, report such non-compliance to £GAT and, subject to the provisions ot paragraphs GC1.5.2 and GCl . S . 3, make such reasonable etforts as are required to remedy such non-compliance as soon as reasonably practicable.

When the non-compliance is with reference to Apparatus connected to the System and is caused solely or mainly as a result of an amendment to the Gri4 Co4e, issued pursuant to GC2.2.4 ot GC2, and the User believes that it would either be unreasonable to require it to remedy such non­compliance or that it should be granted an extended period to reaedy such non-compliance, it shall promptly ~UbDit to EGAT a request, in writing, tor a derogation trom such provision in accordance with the requirements of paragraph GC1. S .4.

When the non-compliance is in respect of Apparatus for which approval to connect to the system is being sought, and the u.er beli eves that it would either be unreasonable to require it to remedy such non- coapliance or that it should be granted an extended period to remedy such non-compliance , it shall promptly submit to EGAT a request, in writing, for a derogation from such provision in accordance with the requirements of paragraph GC1.5.4.

A request tor a derogation from any provision of the Gri4 co40 shall conta i n tho following i n formation;

(a) the issue number and date of the Gri~ co4e against whiCh the present or predicted non­compliance was identified;

(b) identification of the Apparatu., if any, in reapect of which a derogation is sought;

(e) identification of the provision of the Grid Co4e with which the User is, or will be, un~ble to comply;

(d) the reason tor non-compliance with the provision; and

( e ) if the User is seeking a delay in achieving co~pliance, the date by which such co~plianee will be aChieved.

GCl - 2

I

Gel (contin~ed)

GCl.5.5

GC1.'

GCl.6.l

GCl.6.2

On receipt ot any request for a derogation made to it pursuant to paragraph GCl.5.4, £GAT shall consider such request and shall grant such derogation only it, in its reasonable opinion, the derogation can be granted without it having an adverse material impact on the s ecurity, stability or economics of syst •• operation. In its considerations, EGAT ~ay contact the relevant Oser to request claritication or the consideration ot changes to the request. Once BGAT has come to a decision on the request it shall promptly intorm the Oser ot its decision and, in the event that it refuses to grant the derogation, its reasons for sueh refusal. EOAT Shall table any such requests which have been granted at the next following meeting of the Penel.

COMMUNrCATIoN BETWEKN EGAT AND USERS

Unless otherwise specitied in the arid Code all instruction~ g i ven by EGAT and communications (other than relating to the submission of data and notices) botween P.~T and Users shall take place as follows:

(.) where the user is a Generator co~unications shall take place between the BGAT Control Engineer based at the EGATCC notiLied by EGAT to eaCh Genarator trom time to time, and the Generator'. pover Plant; and

(b) where the User is an Externally rnterconnected Perty communicat ions shall take place between the EGAT Control Enqineet based at the EGATCC notified by EGAT to each EXternally Interconnected Party from time to t ime, end the Extetnelly Interconnected Party Control Engineer based at the EXternally Interconnected Party Control cantre notified by the Externally Interconnected Perty t o EOAT tro~ time to tiee.

unless otherwi se specified in the Grid Code, all instructions given by EGAT and communications (other than relating to the submiseion ot data Bnd notices) between P.G~T and User. will be given by means of the Control Telephony.

GCl - 3

GCl. (colLtio\.led)

GCl. 6.3

GCl.6.4

GCl.6.5

Gel.. 7

GCl.7.l

GCl.7.2

Gel.7 . 3

It the EGAT Control Centre is moved to another location, whether due to an emerqency or for any other reason, EGAT shall notify the Ussrs of the new location and any changes to the control "elephony necessitated by SUch IPove, as soon as practicable following the move.

If the EXternally Interconnected Party'e control centre not i fied to EGkT by an EXterna lly Interconnected Party is moved to another location, Whether due to an emorgency or for any other reason, EGAT shall be notified by the EXternally Interconnected Party of the new locaticn and any changes to the Control Telephony necessitated by such move, as soon as practicable fol l owing the move.

The recording (by whatever means) ot instructions or communicat ions given by lPeans of Control Telephony will be accepted by EGAT and Users ~s evidence of those instructions or communications.

DATJI AND NOTICES

Data and notices to be submitted to EGAT \.lnder the Grid code (other t han data Which is the subject of a specific requirement of the Grid Coda as to the manner or its de l iv~ry) shall be delivered in writing either by h~nd or sent by registered first­class, pre-pa id post, or by telex or facsimile transfer.

Data delivered pursuant to paragraph Gel.7.l, in the case of data being submitted to EGJlT, shall be addressed to BGATCC at the address notified by EGAT to each v.er from time to time, or to such other Department within EGkT or address, as EGAT may notify each User from time to time, and in the case o f notices to be s\.lbmit~ed to users, shall be addressed to the chief executive of the addressee (or such othar p~r~on as may be notified by the Users in writinq or EG~T fr om time to time) at its address(es) notified by each User to EGAT in writing from time to t i me for the SUbmission of data and service of notices under the Grid C04a (or failing which to the registered or principal orfice of the addressee).

All datil items, wher .. applicable, will be r e ferenced to noainal voltaqe and Prequeacy \.lnless

GCl - 4

GCl (continuad)

Gel.S

GCl.'

GCl.lO

GCl.ll

GC1.12

otherwiaa stated.

OWNERSHIP OF PLANT AND/OR APPARATUS

References in the G~id Coda to Plant and/or Appar atus of 8 Usar include Plant and/or Apparatus uaed by a U$ar under any agreement with a third party.

SYSTEM CONTROL

Where a User's Syetea (or part thereof) is, by agreement, under the control of saAT, than for the purposes of communication and co- ordination in operational timascales BGAT can (for those purposes only) treat that Ueer 's System (or part thereof) as part of the EGAT Transmiss i on &yetom , but , as between BGAT and the Ueer , it shall remain to be treated as tha Usar ' s aystam (or part thereof).

EMERGENCY SITUATIONS

users should note that tha provisions of the Gri~ Coda may be suspended pursuant to any dira ctions given and/or orders made by Cabinet resolution and/or National Energy Policy council.

CONFIDENTI ALI TY

EGAT and Ueara Shall treat all information received under this Gri~ Co~e as confidential ~nd Shall only release this information to third parties:

( a) Where required to do so under any provision ot the Gr id Code;

(b) Where required to do so under any law or statute;

(e, where the information has entered the public domain other than by BGAT or this Ueer breaohing the oonditions of this GCl.ll.

APPROVALS BY EGAT

Notwithstanding any other provisions of this Grid Code:

GCl - 5

GCl (~ontiDued)

GC1. ll

CC1.ll.1

CC1.13.2

GC1.~3.l

(a) any review by EGAT of any material, doc~ents, designs, drawings, schedules, design data or other information submitted by a Gunerator concerning any of its Power Plants or the Apparatus therein or Appar atus at the User's side of a Connection Point under this Grid Coda; and

(b) any inspection or testing by BGAT ot a pover Plant, the Apparatus therein or Apparatus at the U.er's side of a conneotion Point, undertaken pursuant to this Grid Code;

shall not be deemed t o constitute an endorsement or a warranty o r other assurance by SGAT of the safety, durability or reliability of the Pover Plant or the Apparatlls therein or Apparatus a t the User', aide of a Connection point.

H:tERARCHY

In t he event of any conflict between the provisions o f any direct ion of t he National Energy Pol icy Offico and any provisions of the Grid Code, t he provisions of suoh direotion shall prevail (provided that suoh direotion is binding upon t he person to whom it is addressed), and neither EGAT nor any User shall be l iable for tailing to comply with the oonfl icting provision ot the Grid Code.

In the event of any conflict between the provisions of the Grid Code a nd the provisions of any contraot , agreement or arr~ngement between EGAT ~nd a User, then, subject to the provis i ons ot GCl .l2.l, the provisions of the Gri~ co~e Shall prevail.

Where tor an EXternal :tnt.rconnector there exists a opcciJ'ic writ t en agre"IIl""L between EGAT an<1 the Externally Interconnected Party covering any matter included in th is Grid COde, then this agreement sha ll apply and, tor the purposes of this Grid Code, EGAT shall treat the External Interconnector as if it were part of the Transmission system . In all other cases the provisions of the Grid Code concerning External Znte rconoectors shall apply.

GCl - 6

-

{

GCl (oontinued)

GC1.14

GC~.14.1

GC1.l4.2

ILLEGALITY AND PARTLAL INVALIDITY

If any provision of the Grid Code should become or be declared unlawful or partially invalid for any reason , the validity of all remaining provisions of the Grid Code shall not be affected.

If part of a provision of the Grid code is invalid or unlawful but the rest of such provision would remain valid if the wording were deleted, the provision shall apply with such modifications as may be necessary to aake it valid and effective but without affecting the meaning or validity of any other provision of the Grid Code.

GCl - 7

(

= 7= -=

GC2 GRID CODE R&vIEW

GC2.1 INTRODUCTI ON

GC2.2

GCOl.)

GC2.).l

GC2.l.2

•

GC2.J . J

It i$ accepted that circumstances may arise which will require changes to the Grid Cod.. This procedure provides a tramework within which the relevant changes can be made.

OBJEC'l'lVE

The Grid Coda Review Procedure (GC2) defines the framework which has been adopted to keep under review the rules end provisions contained in the Grid Coda, to allow consideration by all users of suggested changes to the Grid Coda and to allow tor 81l1endments to the ariel Coda to be disseminated.

Till!: GRID CODH R'IN!!!:. PUBL

BGAT shall establish and maintain the panal , which shall be a standing body to carry out the functions referred to in paragraph GC2.3.2.

The PaDel shall:

(a, keep the Grid Coda and its working under review;

[b) review all suggestions (or amendments to the Grid Code which the National Energy Policy Counci lor any U •• r _ay wish to subiDit to EGAT for consideration by tha Pan.l from time to time;

(c) publish recommendations as to amendments to the Grid Cod. that BGAT or the PaD.l feels are necessary or d esirable and the reasons for the recommendations;

(d) issue guidance 1n r elation to the Grid Cod. and i ts implementation, performance and interpretation when asked to do so by any U •• r;

fe) consider what changes are necessary to the Grid Coda arising out of any unforeseen circumstances referred to it by BGAT under GC1.4i and

[fl note all derogations granted to Users in respect of the Grid Co<1e.

The Panel shall consist of the (ollowing persons [each o( who shall have a vote):

GC2 - 1

GC2 (continued)

GC2.3.4

GC2.3.5

GC2. "

(a) a Chairman appointed by BGAT;

(b) [4] persons repr .. senting EGAor (as Trans~is.ion System operator);

(c) (2] persons representing Gsnerators;

(d) [1] person representing smsll paver Producers;

(e) [1] person representing Externally Interconnected Parties;

(t) [1] person appointed by, and representing, the National Energy Policy Council.

each of whom shall be appointed in accordance with the rules issued pursuant to GC2.3.4 below.

The Panel shall establish and comply at all times with its own rules and procedures relating to the conduct of its business, Which shall be approved by the Na t ional Energy Policy council .

EGAT shall submit all proposed amendments to the Grid Cads (regardless o f which party proposes such aaendMent) to the Panel for discussion prior to fulfilling any obligations under its Licence in relation to wider consultation.

GRID CODB AMBNDMENTS

EGAT shall, from time to time, prepare and issue, or make available for issue (and shall publish that such Grid Code is available). amended versions of the Grid code containing such amendments as have been discussed and agreed by the Pansl.

Ge2 - 2