MeteringProject Volume II

7/27/2019 MeteringProject Volume II

http://slidepdf.com/reader/full/meteringproject-volume-ii 1/119

BIDDING DOCUMENTS

FOR.

REPLACING THE METERS & THE METERING SYSTEM AT INTERFACE \ BOUNDARY

WITH THE GENERATORS AND DISTRIBUTORS ALONG WITH ESTABLISHMENT

OF A CENTRAL DATA CENTRE (CDC) AT NEHU SUBSTATION.

SPECIFICATION NO: MePTCL/TT-110/2013-14/



BIDDING DOCUMENTS

(TECHNICAL SPECIFICATIONS)

FOR.

REPLACING THE METERS & THE METERING SYSTEM AT INTERFACE \ BOUNDARY

WITH THE GENERATORS AND DISTRIBUTORS ALONG WITH ESTABLISHMENT

OF A CENTRAL DATA CENTRE (CDC) AT NEHU SUBSTATION.

VOLUME – II

SPECIFICATION NO: MePTCL/TT-110/2013-14/



TECHNICALSPECIFICATION

VOLUME –

II

SECTION – I 11KV CT

SECTION – II 11KV VT

SECTION – III 33KV CT

SECTION – IV 33KV VT

SECTION – V 132KV CT

SECTION – VI 132KV VT

SECTION – VII METER

SECTION – VIII SOFTWARE

SECTION –

IX MODEM



MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED

1/17 Technical specification, Volume-II

Section –I (11KV CT)

TECHNICAL SPECIFICATION OF 11KV CURRENT TRANSFORMERS

1. SCOPE:

This specification covers the design, manufacture and assembly, testing at

manufacturer’s works site, supply& delivery at site of 11 KV outdoor and indoor current transformer required for metering and current protection including differential

protection of transformer

2. CLIMATIC CONDITION AT SITE:

The climatic conditions at site under which the current transformer shall operate are

as follows:

Maximum ambient temperature : 40° C

Minimum ambient temperature : - 5° C

Relative humidity : 62% to 89%

Average annual rainfall. : 2280 mm

No of months of tropical monsoon : 6 months (May to October)

Seismic Zone : V

Maximum altitude : Above 1000m above sea level.

3. STANDARDS:

The items shall conform in all respects to the following relevant standards/regulations

with latest amendments thereof:

Sl. No. Relevant Standards Title

1.0 IS 2705 (Part I to IV) Current transformers

2.0 IS 4201 Application guide for current transformers.

3.0 IS 2099 High voltage porcelain bushings4.0 IS 11322 Partial discharge measurement in instrument

transformer

5.0 IS 2071 Methods of high voltage testing

6.0 IS 335 Insulating oil

7.0 IS 13947 (Part I),

IS 12063

Degree of protection provided by enclosures for

low voltage switchgear and control

8.0 IEC 60044 - 1 Current transformers

9.0 IS 5561 Electric power connections – terminal

connectors

10.0 IS 4759 Hot dip zinc coatings on structural steel and

other allied products

11.0 IS 2633 Methods of testing weight, thickness and






uniformity of coating on hot dipped galvanised

articles

12.0 IS 13134/IEC 60815 Guide for selection of insulators in respect of

polluted conditions

Items matching with requirements of other national or international standards whichensure equal or better performance than the standards mentioned above may also be

considered. When the items offered by the supplier conforms to standards other than

those specified above, salient points of difference between the standards adopted and

standards specified in this specification shall be clearly brought out and a copy of

such standards shall invariably be furnished along with the offer.

4. TYPE AND RATING:

1. The current transformers shall be indoor/outdoor type, single phase, dry

(epoxy resin cast) /oil immersed, self cooled and suitable for operation under the

climatic conditions obtaining at site.

2. The current transformers shall have the following ratings:-

i) Nominal system voltage. 11 KV

ii) Highest system voltage. 12 KV

iii) No. of phases in the system. Three

iv) Earthing of system. Effectively earthed

v) Frequency 50 Hz ± 5%

vi) Rated short time thermal current 13.10 kA for 1 sec

vii) Insulation level

a) 1.2/50 micro second lightning impulse

withstand voltage 75KVp

b) 1 minute power frequency withstand

voltage 28KVrms






3. The current transformers of different ratings shall have the following

characteristics.

Sl.

No.

Rated

transformation

ratio/core

Accuracy

class at all

ratios

Rated

Burden

at allratios

Accuracy limit

factor/instrument

security factor atall ratios

Knee point

voltage at

all ratios Purpose.

1.0 600/1/1/1A Indoor Dry Type (Epoxy Resin )

Core-I 0.2s/ as per

IS std

meeting

CEA

regulation

15 VA ISF ≤ 3.5 - Metering

Core-II 5P10 15 VA ALF : 10 -O/C & E/F

protection.

Core-III PS - -

KPV >=200

RCT at

75oC min

3/4.5Ω,

Imag at

Vk/2=30mA

Differential

protection

2.0 600/1/1/1A Outdoor Type

Core-I 0.2s/ as per

IS std

meeting

CEA

regulation


Core-II 5P10 15 VA ALF : 10 -O/C & E/F

protection.

Core-III PS - -Differential

protection

4. The characteristics of the core classified as PS of the above CT are based on

certain protections assumed and expected to hold good. In case need arises to co-

ordinate any of these characteristics, especially the knee point voltage of the core in

the light of control and relay equipment to be finalized, the tenderer shall keep this

point in view while submitting his offer.

5. TEMPERATURE RISE:

Current transformers shall be capable of carrying their rated primary and secondary

current continuously without any temperature rise exceeding the limits as laid down in

the approved standard to which they are designed and corrected to the difference in

ambient temperature at site and that given in the standard. They shall withstand the

thermal, electrical and mechanical stresses caused by specified symmetrical RMS

breaking current for one second corresponding to a rupturing capacity of 25.0kA for

33 KV circuit breakers.






6. DESIGN FEATURES:

01. GENERAL:

Indoor Type: The current transformers shall be single phase Dry (Epoxy

Resin Cast) type, suitable for the services indicated and conforming to the bestmodern practice of design and manufacture. The transformer unit should be

compatible with ABB indoor type Circuit Breaker presently installed at

NEIGRIHMS substation of type (AL1/XLV) .The design of current

transformers shall be such that its accuracy shall not be affected by the

presence of pollution on the external surface of its insulators.

The locations for installation of current transformers are situated in seismic

zone - V. The design and construction shall be such as to provide necessary

protection against the earthquake forces. Dampers and/or additional

supporting structures may be provided with the voltage transformers, if

necessary, to cater for their operation in the seismic zone.

Outdoor Type: The current transformers shall be single phase, oil

immersed and self cooled type, suitable for the services indicated and

conforming to the best modern practice of design and manufacture. The design

of current transformers shall be such that its accuracy shall not be affected by

the presence of pollution on the external surface of its insulators.



protection against the earthquake forces. Dampers and/or additionalsupporting structures may be provided with the voltage transformers, if


02. CORES:

The cores for the current transformers shall be of high grade non-ageing

electrical silicon laminated steel of low hysteresis loss and high permeability

to ensure high accuracy at both normal and over current.

The cores to be used for metering and indicating instruments shall have a

saturation factor low enough not to cause any damage to meters andinstruments in the event of maximum short circuit currents.

The cores to be used for distance protection and differential protection shall

have a high saturation factor. Magnetisation characteristics curves of these

cores shall be furnished along with the bid.

03. WINDINGS:

Primary winding consisting of suitable number and size of conductors shall be

insulated with special paper having high mechanical strength, high electrical

withstand properties and good ageing qualities. The primary winding shall be

of suitably insulated electrolytic copper wire.






The rating of the secondary windings shall be one/five Ampere. The secondary

terminal shall be brought out in a compartment for easy access. The secondary

terminals shall be provided with shorting arrangements. The secondary taps

shall be adequately reinforced to withstand the normal handling without

damage. Suitably insulated copper wire of electrolytic grade shall be used for secondary windings.

04. TANK:

Each current transformer shall be of Live Tank type to be supplied filled with

insulating oil and shall be hermetically sealed to prevent atmosphere from

coming into contact with oil, avoid filtration and change of oil. In case, the

tenderer intends to use nitrogen or any other inert gas above the oil level as to

permit expansion and contraction of oil, the same shall be stated in the tender.

Both expansion chamber and tank of the current transformer shall be made of high quality steel and shall be able to withstand full vacuum and pressure

occurring during transit, and thermal and mechanical stresses resulting from

maximum short circuit current during operation.

All interiors or exteriors of tanks, secondary box and other metal parts shall be

thoroughly cleaned to remove all rust, scales, corrosion, grease or other

adhering foreign matters. All steel surfaces in contact with insulating oil as far

as accessible shall be painted with not less than two coats of heat resistant oil

insulating varnish. Steel surface exposed to atmosphere if not hot dip

galvanised shall be given a priming coat of zinc chromate and two coats of

light grey rust preventing paint. Other ferrous parts shall be hot-dip galvanised

as per relevant standard.

The metal tank shall have bare minimum number of welded joints so as to

minimize possible locations of oil leakage.

Metal tank of the current transformer shall be provided with two separate

earthing terminals for bolted connection to 50 x 6 mm m.s. flat to be provided

by the purchaser for connection to the station earth mat. The earthing

terminals shall be provided complete with adequate size washers, nuts and

bolts.

The current transformer shall be provided with suitable lifting arrangement for

lifting of the entire unit. The lifting arrangement (lifting eye) shall be

positioned such that the porcelain bushings and tank shall not be damaged

during lifting for transportation/installation.

05. TERMINAL CONNECTORS:

Appropriate number of terminal connectors suitable for ACSR

Panther/Wolf/Raccoon conductor shall be supplied. Suitable terminalconnectors for earth connections shall also be supplied.






06. BUSHINGS:

The bushing and terminal insulator, where provided for the current

transformer shall conform to the latest edition of IS: 2099. The bushings shall

be made of homogeneous, vitreous porcelain of high mechanical and dielectricstrength. Glazing of porcelain shall be of uniform brown or dark brown colour

with smooth surface, arranged to shed away rain water or condensed water

particles.

The bushings shall have ample insulation, mechanical strength and rigidity for

the conditions under which they will be used and shall be designed to prevent

accumulation of explosive gases and to provide adequate oil circulation to

remove internal heat. There shall be no undue stressing of any part of the

bushings due to temperature changes and adequate means shall be provided to

accommodate conductor expansion.

The bushings shall be so designed that when operating at the specified highest

system voltage there will be no electric discharge between the conductors and

bushings. No corrosion or injury would be cause to conductor, insulation or

supports by the formation of substances produced by chemical action. The

insulation of bushing shall be coordinated with that of the current transformer

such that flash-over will occur only externally to the current transformers. The

bushing should not cause radio disturbances when operated at rated voltage.

07. TERMINAL BOX AND JUNCTION BOX:

All secondary terminals shall be brought out in a weatherproof terminal box

on one side of each current transformer. The exterior of this terminal box shall

be hot dip galvanised. A terminal board for short circuiting of secondary

terminals shall be provided.

Cable box alongwith necessary glands for receiving control cables suitable for

mounting on the bottom plate of the terminal box shall be included in the

scope of supply.

A door with locking arrangements shall be provided in the front of the

terminal box so as to permit easy access to the secondary terminals. The door shall have suitable arrangement to check ingress of moisture into the terminal

box.

All terminals shall be clearly marked with identification number to facilitate

connection to external wiring.

Polarity shall be indelibly marked on each primary and secondary terminal.

In addition to terminal box on each current transformer, tenderer shall also

supply a common junction box for each set of three current transformers of

each circuit. The junction box shall be weather proof type suitable for mounting on the steel structure.






The terminal boxes and junction boxes shall be suitable for outdoor

installation and shall conform to IP55 protection class.

08. OIL LEVEL GAUGE:

An oil level gauge shall be provided in indicate the oil level in the current

transformer. The oil gauge shall be mounted in such a way that the oil level

can be seen from the ground level.

09. PRESSURE RELIEVING DEVICES:

Each current transformer shall be provided with a pressure relieving device so

as to prevent bursting of current transformer even under unfavourable

conditions.

10. OIL DRAIN COCK:

An oil drain cock alongwith a stop cock shall be provided in the bottom

flange so as to permit taking of oil samples for testing.

11. OIL FILLING COCK:

An oil filling cock along with a stop cock shall be provided for filling the oil

in the current transformer.

7. MOUNTING STRUCTURES:

The current transformers shall be mounted on steel structures, at a height of 2.5m

from ground level. The tenderer shall ensure that the CTs supplied can be mounted on

the existing steel (galvanized) structures. Necessary connecting materials, such as

clamps, bolts, nuts, washers, etc. as well as foundation bolts for the supporting

structures shall be supplied by the tenderer.

8. RATING PLATE:

Each current transformer shall be provided with a non-corrosive rating plate inaccordance with latest edition of IS: 2705 Part-I. Following additional particulars

shall also be marked on the rating plate of each current transformer.

a) Purpose (measurement or protection), rated output at 0.9 PF lagging, rated

accuracy factor and rated class of accuracy of each secondary winding in

terms of IS: 2705.

b) Terminal numbering of each secondary winding.

c) Knee point voltage.

d) Maximum exciting current at knee point voltage.






e) Secondary winding resistance at 75°C.

f) Rated instrument security factor in respect of winding meant for measurement

and metering.

9. INSULATING OIL:

The quantity of oil for first filling of each CT and the complete specifications of oil

proposed to be used shall be stated. It would be desirable to use oil conforming to the

provisions of latest IS: 335.

10. TESTS:

ROUTINE TESTS:

Each current transformer shall be subjected to routine tests as specified in the latestedition of IS: 2705 (Part I to IV). If the purchaser wishes to have a representative,

tests shall be performed in his presence so as to be witnessed by him.

The routine tests shall consist of the following:

(a) Verification of terminal markings and polarity

(b) Power frequency dry withstand tests on primary winding

(c) Power frequency dry withstand test on secondary windings

(d) Over voltage inter-turn test

(e) Determination of errors or other characteristics according to the

requirements of the appropriate designation or accuracy class as per

individual parts of IS: 2705.

(f) Knee-point voltage and exciting current for PS Class cores

(g) Secondary winding resistance for PS Class cores

(h) Turns ratio for PS Class cores

TYPE TESTS:

The bidder shall furnish four sets of all the type test reports from CPRI or other

accredited laboratories along with the offer. The type tests must have been conducted

less than five years from the date of opening of bid. The Purchaser reserves the right

to repeat the type tests in the presence of a representative at the cost of the Supplier.

The type tests shall be in accordance with the latest edition of IS: 2705 (Part I to IV),and shall consist of the following:






(a) Short-time current tests

(b) High voltage power frequency wet withstand test

(c) Determination of errors or other characteristics according to therequirements of the appropriate designation or accuracy class as per


(d) Temperature rise test

(e) Lightning impulse voltage test

(f) Degree of protection tests of secondary terminal, junction box

All the test reports shall be submitted and got approved by the purchaser, before

despatch of the equipment.

SPECIAL TESTS:

The special tests shall consist of the following:

a. Chopped lightning impulse test as a type test

b. Mechanical test

11. DRAWINGS AND INSTRUCTION MANUALS:

The tenderer shall submit, with the tender, all the drawings enumerated in this

specification to enable to purchaser to assess the suitability of equipments.

As soon as possible after the award of the contract, the manufacturer shall supply six

copies of the following drawings which shall describe the equipment in full details for

approval and shall subsequently provide eight complete sets of final approved

drawings, one of which shall be autopositive/soft copy suitable for reproduction.

i.

Outline dimensional drawings.

ii. Assembly Drawings.

iii. Cross sectional view of the current transformer.

iv. Drawings giving details of supporting structures and foundation.

v. Drawing showing the details of terminal connectors.

vi. Magnetising curves.

vii. Wiring diagram with polarity mark.






In addition to the above drawings, the tenderer may supply any other drawing, which

in his opinion is required to describe the equipment in full details.

After the completion of the erection work, the contractor shall furnish seven sets

(including one reproducible on soft copy) of the completion drawings. Six copies of instruction manuals covering instruction for installation and maintenance check tests

shall be supplied by the contractor as a part of this contract.

12. SPARE PARTS:

A list of spare parts recommended for five years operation for the current

transformers shall be furnished with the tender. The purchaser shall decide the actual

quantity of spare parts to be ordered on the basis of the list and the item-wised prices

of spare parts called for in Schedule-V.

13. COMPLETENESS OF EQUIPMENT:

The tenderer shall be complete in all respect and include all accessories which may

not be specifically mentioned in this specification but which are essential for the

completeness of equipment ordered.

14. DEVIATIONS FROM SPECIFICATIONS:

All deviations from the specification shall be separately listed as per proforma given

in Schedule-III, in the absence of which it shall be presumed that the provisions of the

specification are complied with by the tenderer.

15. ERECTION AND SUPERVISION:

The purchaser may at his discretion ask the tenderer to do either the complete erection

or supervision of erection at site of the equipment covered by this specification. The

tenderer shall, therefore, quote their charges separately for (i) erection and (ii) rates

for supervision of erection.

However, if it is decided to do the erection of the above equipment departmentally,

the tenderer shall furnish full and detailed instructions complete with drawings andleaflets to enable the satisfactory erection and commissioning of the equipment by the

purchaser. Such instructions shall reach the purchaser well in advance so that there is

no delay in commencement of erection. The successful tenderer shall supply all

special tools necessary for erection. Details of such tools and the price thereof shall be

stated in the tender separately.

16. GUARANTEED TECHNICAL PARTICULARS:

Guaranteed technical particulars as called for in Schedule-I shall be furnished

alongwith the tender. Any tender lacking the complete information in this respect is

likely to be rejected. Particulars which are not subject to guarantee shall be clearlymarked.






17. SCHEDULE OF INSTALLATION:

Tenderer shall furnish a list of similar equipment supplied by him and presently in

service as per proforma given in Schedule-IV.

18. PACKING & FORWARDING:

The equipment shall be packed in suitable crates so as to withstand handling during

transport and outdoor storage. The supplier must be responsible for any damage to the

equipment during transit due, to improper and inadequate packing. Any material

found short/damaged shall be replaced by the supplier at no extra cost to the

purchaser.

19. SCHEDULE OF REQUIREMENTS:

1. 33 KV single phase, outdoor type current transformers as specified in the

specification above and rating details as per Clause 4.3 and as mentioned below:

Sl. No. Rated transformation

ratio/coreQuantity

1.0 600-300/1/1/1/A (Indoor

Type)

6 Nos

2.0 600-300/1/1/1/A(Outdoor Type) 3 Nos






SCHEDULE-I

GUARANTEED TECHNICAL PARTICULARS

(The Tenderer shall furnish separate GTPs for different CT ratings)

1. Manufacturer’s name and country of origin:

2. Manufacturer’s type, designation and model:

3. Current transformers data: Core-I Core-II Core-III Core-IV

a. Rated primary current (A):

b. Rated secondary current (A):

c. Transformation ratio:

d. Rated output at 0.9

lagging PF (VA):

e. Class of accuracy:

f. Accuracy limit factor:

g. Knee point voltage (V):

h. Excitation current at

knee point voltage (mA):

i. Secondary limiting voltage:

j. Resistance of secondary winding

at 75°C (Ω):

4. Nominal rated voltage (KV):

5. Maximum voltage of operation (KV):

6. One second over-current factor

(times rated current):

7. Short time thermal rating for:

a) One second. kA (rms):

b) Three seconds kA (rms):

8. Rated dynamic current (Peak value):

9. Instrument security factor for the windingmeant for measurement and metering:






10. Rated continuous thermal current

and corresponding temperature rise (kA°C):

11. Creepage distance (mm):

12. One minute power frequency dry

withstand test voltage - KV(rms):

13. One minute power frequency wet


14. 1.2/50 micro second full wave

impulse withstand test voltage - KV(Peak):

15 Weight of oil per CT (Kg):

16 Class of oil:

17 Whether pressure relief device

provided (Yes/No):

18 Total weight per C.T. (Kg):

19 Magnetisation curves of C.T.cores

supplied with tender and total

drawing Nos. attached:

20 Overall dimensions (mm x mm x mm):

21 Mounting details:

22 Shipping dimensions of largest package

(mm x mm x mm):

23 Shipping weight of heaviest package (Kg):

24

Enclosed copies of test reports etc:

(Signature of Tenderer)

Name (in block letters)

Stamp






SCHEDULE-II

SCHEDULE OF PRICES

(to be filled in by Tenderer)

Note : In addition to filling up this Schedule, the Tenderer shall attach separately a detailedlist of materials he is supplying.

S l . N o .

Description U n i t

Q u a n t i t y

E x - W o r k

R a t e ( P )

E x c i s e D u t y

( P )

T a x

( P )

F r e i g h t

&

I n s u r a n c e

( P )

U n i t R a t e

F O R

D e s t i n a t i o n

( P )

T o t a l

A m o u n t ( P )

( i ) (ii) ( i i i ) ( i v )

(v) (vi) (vii) (viii)

(ix)=(v)+

(vi)+(vii)+

(viii) ( x

) = ( i v )

x ( i x )

1 11KV single phase,

indoor dry type/outdoor,

oil filled current

transformer complete

with terminal boxes,

junction boxes and

terminal connectors as

detailed in ‘Schedule of

Requirements’

A 600-300/1/1/1/A (Indoor Type)

Nos 6

B 600-300/1/1/1/A

(Outdoor Type) Nos 3



Stamp






SCHEDULE-III

SCHEDULE OF DEVIATION FROM SPECIFICATION

Sl. No. Specification Clause No. Details of deviation Justification for

deviation.



Stamp






SCHEDULE-IV

SCHEDULE OF INSTALLATION

Tenderer shall furnish here a list of similar equipment supplied by him and presently inservice.

Brief description Customer Year of supply


Name (In block letters)

Stamp.






SCHEDULE-V

SCHEDULE OF SPARE PARTS AND TOOLS

Sl.

No.

Description of Spare Parts Quantity Rate Amount



Stamp





Section –II (11KV VT)

SPECIFICATION OF 11KV VOLTAGE TRANSFORMER (FOR METERING AND

PROTECTION)

1. SCOPE:

This specification covers the design, manufacture, assembly, testing at manufacturer’sworks, supply, delivery at site of 11KV outdoor voltage transformers and 11KV

indoor voltage transformer (Dry type) .

2. CLIMATIC CONDITION :

The climatic conditions at site under which the voltage transformer shall operate are

as follows:






Seismic Zone : V


3. STANDARDS:




1.0 IS 3156 (Part I to III) Voltage transformers

2.0 IS 4146 Application guide for voltage transformers.

3.0 IS 2099 High voltage porcelain bushings

4.0 IS 11322 Partial discharge measurement in instrumenttransformer



7.0 IS 13947 (Part I),

IS 12063



8.0 IEC 60044 – 2 Voltage transformers


connectors










articles

12.0 IS 13134 Guide for selection of insulators in respect of

polluted conditions

Items matching with requirements of other national or international standards which

ensure equal or better performance than the standards mentioned above may also beconsidered. When the items offered by the supplier conforms to standards other than




4. TYPE AND RATING:

a. The voltage transformer shall be single phase, oil immersed; self cooled core

type suitable for outdoor operation, effectively earthed under the climatic condition as

given in this specification.

b. The voltage transformers shall have the following ratings:

i) Normal system voltage : 11 KV

ii) Highest system voltage : 12 KV

iii) Frequency : 50 Hz ± 5%

iv) System of earthing : Effectively earthed

v) Ratio : 11/√3 KV: 110V/√3V-110V/√3

vi) No. of secondary windings : Two

vii) Rated burden:

(a) Winding I : 100VA

(b) Winding II : 75VA

viii) Class of accuracy:

(a) Winding I : 0.2 as per IS 11448

(b) Winding II : 3P as per IS 11448/IEC

60044-2ix) Power frequency withstand voltage

for one minute : 28 KV

x) Standard impulse withstand voltage : 75 KV

xi) Fault level : 12.5 kA

xii) Rated short circuit withstand capability : 16.0kA for 1 sec

xiii) Class of insulation : A

xiv) Rated voltage factor : 1.2 – continuous,

1.5 for 30 seconds






5. DESIGN AND CONSTRUCTION:

Indoor Type: The current transformers shall be Three phase Dry (Epoxy Resin

Cast) type, suitable for the services indicated and conforming to the best modern

practice of design and manufacture. The transformer unit should be compatible withABB indoor type Circuit Breaker presently installed at NEIGRIHMS substation of

type (AL1/XLV). The design of current transformers shall be such that its accuracy

shall not be affected by the presence of pollution on the external surface of its

insulators.

The locations for installation of current transformers are situated in seismic zone - V.

The design and construction shall be such as to provide necessary protection against

the earthquake forces. Dampers and/or additional supporting structures may be

provided with the voltage transformers, if necessary, to cater for their operation in the

seismic zone.

Outdoor Type: The voltage transformers shall be complete in all respects

conforming to the modern practice for design and manufacture. The design of voltage

transformers shall be such that its accuracy shall not be affected by the presence of

pollution on the external surface of its insulators.

The locations for installation of voltage transformers are situated in seismic zone - V.




seismic zone.

a. CORES:

The core shall be of high grade non-ageing, electrical silicon laminated steel

of low hysteresis and eddy current losses and high permeability to ensure high

accuracy at both normal and over voltages.

b. WINDINGS:

Primary windings: The primary winding of the voltage transformer shall be

connected in phase to neutral with the neutral point solidly earthed. Theneutral of the system is also solidly earthed. The primary winding shall be of

suitably insulated electrolytic copper wire.

Secondary windings: The voltage transformer shall be provided with two

separate secondary windings rated for 110V/√3 and 110V/√3. Suitably

insulated copper wire of electrolytic grade shall be used for secondary

windings.

c. TANK:

Each voltage transformer shall be supplied filled with insulating oil and shall

be hermetically sealed to prevent atmosphere from coming into contact withoil, avoid filtration and change of oil.






The tank shall be fitted with oil gauge and provisions for convenient filling

and draining of oil. The oil gauge shall be mounted in such a way that the oil

level can be seen from the ground level.

Both expansion chamber and tank of the voltage transformer shall be made of high quality steel and shall be able to withstand full vacuum and pressure



The tank shall be given three coats of rust preventing paint. Other ferrous parts

shall be hot-dip galvanised as per relevant standard.



Metal tank of the voltage transformer shall be provided with two separateearthing terminals for bolted connection to 50 x 8 mm m.s. flat to be provided



bolts.

The voltage transformer shall be provided with suitable lifting arrangement for




The voltage transformer shall be constructed such that it can be easily transported to

site within the allowable transport limitation and in horizontal position, if the

transport limitations so demand.

6. BUSHING:

a. Oil filled condenser type porcelain bushings shall be used on the voltage

transformers. The porcelain shall be homogenous, thoroughly vitrified, tough

and impervious to moisture. The glazing of porcelain shall be of uniform

brown colour, free from blisters, burns and other similar defects. The bushings

shall have ample insulation, mechanical strength and rigidity for theconditions under which they will be used and shall be designed to prevent





b. The bushings shall be so designed that when operating at the specified highest




insulation of bushing shall be coordinated with that of the voltage transformer






such that flash-over will occur only externally to the voltage transformers. The


c. In general the bushings shall conform to the latest issue of IS: 2099 or

equivalent.

d. Each of the bushings shall be complete with the following fittings.

i. Bimetallic expansion type terminal connector.

ii. Oil level sight gauge and convenient means of filling, sampling and

drawing of oil.

iii. End shield for even distribution of stresses.

iv. Corona shields for bushing, if required.


Potential transformers shall be capable of carrying their rated burden continuously at

rated voltage and frequency without the temperature rise exceeding the limits laid

down in the approved standard, to which they are designed and corrected to difference

in ambient temperature at site and that given in the standard. The temperature rise at

1.2 times rated primary voltage when applied continuously at rated frequency and at

rated burden shall not exceed the limits specified in the standard and the temperature

rise at 1.5 times rated primary voltage when applied for 30 seconds starting from

previous stable operation condition at rated frequency and rated burden shall not

exceed the temperature limits by more than 10°C.

8. PRESSURE RELIEVING DEVICE:

Each voltage transformers shall be provided with a pressure relieving device capable

of releasing abnormal internal pressure.

9. INSULATING OIL:

The quantity of the insulating oil for first filling of each potential transformer and the

complete specifications of oil proposed to be used shall be stated. The oil preferablyconforms to the requirement of latest IS: 335.


Terminal connectors suitable for ACSR Panther conductors shall be supplied. Suitable

terminal connectors for earthing connections shall also be supplied.


Each voltage transformer shall be provided with one or more terminal boxes suitably

located to house the terminals of the two secondary windings. The terminal box shall be outdoor type, vermint proof and shall be provided with a door in front so as to have






easy access to the secondary terminals. The door shall have a sealing/locking

arrangement and shall be suitable to prevent penetration of moisture and rain water.

The terminal box shall be provided with removable gland plate and glands suitable for

1100 volts grade PVC insulated, PVC sheathed multi-core 2.5 sq. mm. to 6 sq. mm.

stranded copper conductor cable.

The terminal box, with the cover closed and tightened and the cable/conduit in

position when supplied shall have degree of protection not less than IP55 conforming

to latest issue of IS: 13947 (Part I).

Polarity shall be indelibly marked at the secondary terminals in the terminal box.

In addition to terminal box on each voltage transformer, tenderer shall also supply a

common junction box for each set of three voltage transformers of each circuit. The

junction box shall be weather proof type suitable for mounting on the steel structure.

Sufficient number of terminals shall be provided in the junction box for connecting

the leads from individual voltage transformer and formation of star or delta as

required and to relay metering in the control room.

13. MARKING:

i) RATING PLATE:

Each voltage transformer shall be provided with a non-corrosive and non-rusting

name and rating plate as per latest issue of IS: 3156 (Part-I). The plates shall have

information such as rated output, accuracy, terminal numbering of secondary

windings, as well, as the following indelibly marked on it.

a) Manufacturer’s name and country of origin.

b) Manufacturer’s serial number. c) Rated transformer ratio.

d) Rated frequency.

e) Rated output per phase and accuracy class.

f) Number of phase and method of connection.

g) Type of transformer

h)

Highest system voltagei) Insulation level

ii) TERMINAL MARKING:

The terminal marking shall identify.

a) The primary & secondary winding.

b) The winding section if any.

c) The relative polarities of windings.

iii) METHOD OF MARKING:






a) The terminals shall be marked clearly and indelibly either on the surface or

in their immediate vicinity.

b) The marking shall consist of letter followed by numbers.

14. TESTS:

ROUTINE TESTS:

Each voltage transformer shall be subjected to routine tests as specified in the latest

edition of IS: 3156 (Part I to III). If the purchaser wishes to have a representative,




(b) Power frequency tests on primary winding

(c) Power frequency test on secondary windings

(d) Determination of errors(e) Oil leakage test

TYPE TESTS:

The bidder shall furnish four sets of all the type test reports along with the offer. The

type tests must have been conducted less than five years from the date of opening of

bid. The Purchaser reserves the right to repeat the type tests in the presence of a

representative at the cost of the Supplier.

The type tests shall consist of the following:




(d) Determination of errors

(e) Temperature rise test

(f) Impulse voltage test

(g) Degree of protection of secondary terminal box

(h) Partial discharge measurement

15.

DRAWING AND INSTRUCTION MANUAL:

The tenderer shall submit with the tender all the drawings to enable the purchaser to

assess the suitability of the equipment.


copies of following drawings which shall describe the equipment in full detail for

approval, and shall subsequently provide eight complete sets of final approved

drawings, one of which shall be auto positive/soft copy suitable for reproduction.

a) Outline dimensional drawings.

b) Assembly drawings.c) Cross sectional view of the voltage transformer.






d) Foundation drawings.

e) Drawings showing the details of terminal connectors.

f) Magnetising curves.

g) Wiring diagram with polarity mark.

In addition to the above drawings, the tenderer may supply any other drawing, whichin his opinion is necessary to describe the equipment in full detail.


(including one soft copy) of the completed drawings.

Six copies of the instruction manual covering instruction for installation and

maintenance check tests shall be supplied by the contractor as part of this contract..

16. SPARE PARTS:

A list of the spare parts recommended for five years operation of the PT shall befurnished with the tender. The purchaser shall decide the actual quantity of spare parts

to be ordered on the basis of the list and the item wised prices of spare parts called for

in Schedule - III.

17. COMPLETENESS OF THE EQUIPMENT:-



completeness of the equipment ordered.

18. DEVIATION FROM SPECIFICATION:-


at Schedule - II, in absence of which it shall be presumed that the provisions of the


Leaflets to enable the satisfactory erection and commissioning of the equipment by

the purchaser. Such instructions shall reach the purchaser well in advance so that there

is no delay in commencement of erection. The successful tenderer shall supply all

special tools necessary for erection. Details of such tools and the prices thereof shall

be stated in the tender separately.

19. GUARANTEED & TECHNICAL PARTICULARS:-

Guaranteed technical particulars as called for in Schedule-I shall be furnished along

with the tender. Any tender lacking complete information in this respect is likely to be

rejected. Particulars which are subject to guarantee shall be clearly marked.

21. SCHEDULE OF INSTALLATION:-

Tenderer shall furnish a list of similar equipment supplied by him and presently inservice as per proforma given in schedule - IV.






22. SCHEDULE OF REQUIREMENT:


ratio/core Quantity1.0 Single phase 11000V/√3:

110V/√3 – 110V/√3Voltage transformer

complete with protection

fuses, terminal boxes and


detailed in specification.

(Indoor Type)

3 Nos

2.0 Single phase 11000V/√3:110V/√3 – 110V/√3Voltage transformer


fuses, terminal boxes and


detailed in specification.

(Outdoor Type)

3 Nos


The equipment shall be packed in suitable crates so as to withstand handling duringtransport and outdoor storage. The supplier must be responsible for any damage to the



purchaser.






SCHEDULE-I

SCHEDULE OF GUARANTEED TECHNICAL PARTICULARS

1. Type

2. Manufacturers type designation.

3. Rated primary voltage. Volts.

4. Number of secondary winding

5. Rated secondary voltage Volts

Winding I

Winding II

6. Rated burden VA

Winding I

Winding II

7. Accuracy class

Winding I

Winding II

8. Temp rise at 1.2 times rated voltage and rated burden and frequency °C

9. Rated voltage factor at rated frequency, burden and time

10. Temp.rise for item 9 above. °C

11. One minute power frequency withstand test (dry) voltage on primary winding

KV(Rms)

12. One minute power frequency withstand test (wet) voltage on primary winding

KV(Rms)

13. 1.2/50 micro second impulse wave withstand test voltage KV(Peak)

14. One minute power frequency withstands test voltage on secondary winding

KV(Rms)

15. Bushing creepage distance (mm)

16. Variation in ration and phase angle error for variation in:

a) Voltage by 1%

b) Frequency by 1 Cycle

16. Whether corona shield is provided or not






17. (a )Weight of oil filling. Kg.

(b) Total weight. Kg.

(c) Overall dimension. mm

(d) Mounting detail

(e) Shipping dimension of largest package Kg

18. Enclose copies of test reports etc.



Stamp.






SCHEDULE - II

SCHEDULE OF DEVIATION BY THE TENDERER

1. General condition of contract.

Sl.

No

.

Specification Clause Deviation by the tenderer Justification

by the

tenderer

`1 2 3 4

2. Technical specification of contract.

Sl.No. Specification Clause

No.

Details of deviation Justification for

deviation.

-----------------------------------------------------------------------------

CERTIFICATE: The tenderer hereby certify that the above mentioned are the only deviation

from the purchaser specification.



Stamp.






SCHEDULE - III


Sl.No. Description of spare parts Qty. Rate Amount



Stamp.






SCHEDULE-IV

SCHEDULE OF PRICES



S l . N o .

Description U n i t

Q u a n t i t y

E x - W o r k

R a t e ( P )

E x c i s e D u t y

( P )

T a x

( P )

F r e i g h t

&

I n s u r a n c e

( P )

U n i t R a t e

F O R


( P )

T o t a l

A m o u n t ( P )

( i )(ii) ( i i i )

( i v )


(ix)=(v)+

(vi)+(vii)+

(viii) ( x

) = ( i v )

x ( i x )

1 Outdoor Type: Single

phase 11000V/√3 :110V/√3 – 110V/√3voltage transformer

complete with

protection fuses,

terminal boxes,

junction boxes and


detailed in ‘Schedule of Requirements’

N o s .

2Indoor Type: Three

phase 11000V/√3110V/√3 – 110V/√3voltage transformer

complete with

protection fuses,

terminal boxes,

junction boxes and

terminal connectors asdetailed in ‘Schedule of Requirements’

S e t



Stamp.





Section –III (33KV CT)


1. SCOPE:

This specification covers the design, manufacture and assembly, testing at

manufacturer’s works site, supply& delivery at site of outdoor and indoor currenttransformer required for metering and current protection including differential

protection of transformer/distance protection of lines.



as follows:






Seismic Zone : V


3. STANDARDS:







transformer



7.0 IS 13947 (Part I),

IS 12063





connectors










articles


polluted conditions






4. TYPE AND RATING:

1. The current transformers shall be outdoor type, single phase, oil immersed,

self cooled and suitable for operation under the climatic conditions obtaining at site.







vi) Rated short time thermal current 25.0kA for 1 sec




b ) 1 minute power frequency withstand

voltage 70KVrms

viii) Minimum creepage distance 900 mm







characteristics.

Sl.

No.

Rated

transformation

ratio/core

Accuracy

class at

all ratios

Rated

Burden

at allratios

Accuracy limit

factor/instrument


Knee point

voltage at

all ratios Purpose.

1.0 1600-1000

/1/1/1A

Core-I 0.2s/ as

per IS std

meeting

CEA

regulation


Core-II 5P 30 VA ALF : 10 -O/C & E/F

protection.

Core-III PS - - 40R CT + 155Differential

protection

2.0 800-400

/1/1/1A

Core-I 0.2s/ as

per IS std

meeting

CEA

regulation



protection.


protection

3.0 600-300

/1/1/1A

Core-I 0.2s/ as

per IS std

meeting

CEA

regulation


Core-II 5P 30 VA ALF : 10 - O/C & E/F protection.


protection

4.0 200-100

/1/1/1A

Core-I 0.2s 30 VA ISF ≤ 3.5 - Metering


protection.


protection






4. The characteristics of the core classified as PS of the above CT are based on

certain protections assumed and expected to hold good. In case need arises to co-








ambient temperature at site and that given in the standard. They shall withstand the

thermal, electrical and mechanical stresses caused by specified symmetrical RMS



6. DESIGN FEATURES:

01. GENERAL:

The current transformers shall be single phase, oil immersed and self cooled

type, suitable for the services indicated and conforming to the best modern

practice of design and manufacture. The design of current transformers shall

be such that its accuracy shall not be affected by the presence of pollution on

the external surface of its insulators.






02. CORES:





saturation factor low enough not to cause any damage to meters and

instruments in the event of maximum short circuit currents.









03. WINDINGS:

Primary winding consisting of suitable number and size of conductors shall be

insulated with special paper having high mechanical strength, high electrical



The rating of the secondary windings shall be one/five Ampere. The secondary




damage. Suitably insulated copper wire of electrolytic grade shall be used for

secondary windings.

04. TANK:

Each current transformer shall be of Live Tank type to be supplied filled withinsulating oil and shall be hermetically sealed to prevent atmosphere from




Both expansion chamber and tank of the current transformer shall be made of

high quality steel and shall be able to withstand full vacuum and pressure

















bolts.











Appropriate number of terminal connectors suitable for ACSR

Panther/Wolf/Raccoon conductor shall be supplied. Suitable terminal

connectors for earth connections shall also be supplied.

06. BUSHINGS:



be made of homogeneous, vitreous porcelain of high mechanical and dielectric

strength. Glazing of porcelain shall be of uniform brown or dark brown colour


particles.


the conditions under which they will be used and shall be designed to preventaccumulation of explosive gases and to provide adequate oil circulation to














be hot dip galvanised. A terminal board for short circuiting of secondary

terminals shall be provided.

Cable box alongwith necessary glands for receiving control cables suitable for mounting on the bottom plate of the terminal box shall be included in the

scope of supply.


terminal box so as to permit easy access to the secondary terminals. The door

shall have suitable arrangement to check ingress of moisture into the terminal

box.











each circuit. The junction box shall be weather proof type suitable for

mounting on the steel structure.

The terminal boxes and junction boxes shall be suitable for outdoor installation and shall conform to IP55 protection class.






Each current transformer shall be provided with a pressure relieving device soas to prevent bursting of current transformer even under unfavourable

conditions.

10. OIL DRAIN COCK:












8. RATING PLATE:

Each current transformer shall be provided with a non-corrosive rating plate in

accordance with latest edition of IS: 2705 Part-I. Following additional particulars




terms of IS: 2705.











and metering.

9. INSULATING OIL:




10. TESTS:

ROUTINE TESTS:

Each current transformer shall be subjected to routine tests as specified in the latest

edition of IS: 2705 (Part I to IV). If the purchaser wishes to have a representative,







(e) Determination of errors or other characteristics according to the



(f)

Knee-point voltage and exciting current for PS Class cores

(g) Secondary winding resistance for PS Class cores

(h) Turns ratio for PS Class cores

TYPE TESTS:










The type tests shall be in accordance with the latest edition of IS: 2705 (Part I to IV),

and shall consist of the following:

(a) Short-time current tests


(c) Determination of errors or other characteristics according to the








SPECIAL TESTS:



b. Mechanical test





copies of the following drawings which shall describe the equipment in full details for



i. Outline dimensional drawings.















(including one reproducible on soft copy) of the completion drawings. Six copies of

instruction manuals covering instruction for installation and maintenance check tests


12. SPARE PARTS:











in Schedule-III, in the absence of which it shall be presumed that the provisions of the







However, if it is decided to do the erection of the above equipment departmentally,the tenderer shall furnish full and detailed instructions complete with drawings and

leaflets to enable the satisfactory erection and commissioning of the equipment by the













likely to be rejected. Particulars which are not subject to guarantee shall be clearly

marked.


Tenderer shall furnish a list of similar equipment supplied by him and presently inservice as per proforma given in Schedule-IV.






purchaser.


1. 33 KV single phase, outdoor type current transformers as specified in the

specification above and rating details as per Clause 4.3 and as mentioned below:


ratio/coreQuantity

1.0 1600-800/1/1/1/A 3 Nos

2.0 800-400/1/1/1/A 48 Nos3.0 600-300/1/1/1/A 12 Nos

4.0 200-100/1/1/1/A 15 Nos






SCHEDULE-I










lagging PF (VA):








at 75°C (Ω):

























16 Class of oil:


provided (Yes/No):








(mm x mm x mm):


24




Stamp.






SCHEDULE-II

SCHEDULE OF PRICES



S l . N o .

Description U n i t

Q u a n t i t y

E x - W o r k

R a t e ( P )

E x c i s e D u t y

( P )

T a x

( P )

F r e i g h t

&

I n s u r a n c e

( P )

U n i t R a t e

F O R


( P )

T o t a l

A m o u n t ( P )

( i ) (ii) ( i i i ) ( i v )


(ix)=(v)+

(vi)+(vii)+

(viii) ( x

) = ( i v )

x ( i x )


outdoor, oil filled current



junction boxes and



Requirements’

A 1600-1000/1/1/1/A N o s

3

B 800-400/1/1/1/A N o s

48

C 600-300/1/1/1/A N o s

12

D 200-100/1/1/1 A N o s

15



Stamp.






SCHEDULE-III


Sl. No. Specification Clause No. Details of deviation Justification for deviation.



Stamp.






SCHEDULE-IV


Sl.

No.




Stamp.





Section –V (33KV VT)

SPECIFICATION OF 33KV VOLTAGE TRANSFORMER (FOR METERING AND

PROTECTION)

1. SCOPE:

This specification covers the design, manufacture, assembly, testing at manufacturer’sworks, supply, delivery at site, erection, testing and commissioning of outdoor voltage

transformers required for 33 KV Sub-Stations.



as follows:






Seismic Zone : V


3. STANDARDS:










7.0 IS 13947 (Part I),

IS 12063



8.0 IEC 60044 - 2 Voltage transformers


connectors










articles


polluted conditions






4. TYPE AND RATING:

a. The voltage transformer shall be single phase, oil immersed; self cooled core








v) Ratio : 33/√3 KV: 110V/√3V-110V/√3


vii) Rated burden:




(a) Winding I 0.2 as per IS 11448

(b) Winding II : 3P as per IS 11448/IEC

60044-2ix) Power frequency withstand voltage


x) Standard impulse withstand voltage : 170 KV

xi) Fault level : 20.0kA




1.5 for 30 seconds







The voltage transformers shall be complete in all respects conforming to the modern

practice for design and manufacture. The design of voltage transformers shall be such

that its accuracy shall not be affected by the presence of pollution on the externalsurface of its insulators.





seismic zone.

a. CORES:

The core shall be of high grade non-ageing, electrical silicon laminated steelof low hysteresis and eddy current losses and high permeability to ensure high


b. WINDINGS:


connected in phase to neutral with the neutral point solidly earthed. The

neutral of the system is also solidly earthed. The primary winding shall be of





windings.

c. TANK:

Each voltage transformer shall be supplied filled with insulating oil and shall

be hermetically sealed to prevent atmosphere from coming into contact with

oil, avoid filtration and change of oil.




Both expansion chamber and tank of the voltage transformer shall be made of













Metal tank of the voltage transformer shall be provided with two separate


by the purchaser for connection to the station earth mat. The earthingterminals shall be provided complete with adequate size washers, nuts and

bolts.








6. BUSHING:





shall have ample insulation, mechanical strength and rigidity for the

conditions under which they will be used and shall be designed to prevent









insulation of bushing shall be coordinated with that of the voltage transformer




equivalent.


i. Bimetallic expansion type terminal connector.


drawing of oil.









Potential transformers shall be capable of carrying their rated burden continuously atrated voltage and frequency without the temperature rise exceeding the limits laid









Each voltage transformers shall be provided with a pressure relieving device capable

of releasing abnormal internal pressure.

9. INSULATING OIL:

The quantity of the insulating oil for first filling of each potential transformer and the

complete specifications of oil proposed to be used shall be stated. The oil preferably

conforms to the requirement of latest IS: 335.


The voltage transformers shall be mounted on steel structures. The tenderer shall

quote separately for the supporting structures of 2.5m high each. Necessary

connecting materials, such as clamps, bolts, nuts, washers, etc. and foundation bolts

for mounting the equipment on the supporting structures shall be galvanised and shall

be supplied by the tenderer.


Terminal connectors suitable for ACSR Panther conductors shall be supplied. Suitable




located to house the terminals of the two secondary windings. The terminal box shall

be outdoor type, vermint proof and shall be provided with a door in front so as to have




1100 volts grade PVC insulated, PVC sheathed multi-core 2.5 sq. mm. to 6 sq. mm.stranded copper conductor cable.







position when supplied shall have degree of protection not less than IP55 conforming

to latest issue of IS: 13947 (Part I).








13. MARKING:

i) RATING PLATE:





a) Manufacturer’s name and country of origin. b) Manufacturer’s serial number. c) Rated transformer ratio.

d) Rated frequency.




h) Highest system voltage

i) Insulation level


The terminal marking shall identify.

a)

The primary & secondary winding. b) The winding section if any.











14. TESTS:

ROUTINE TESTS:


edition of IS: 3156 (Part I to III). If the purchaser wishes to have a representative,tests shall be performed in his presence so as to be witnessed by him.






(e) Oil leakage test

TYPE TESTS:














15. DRAWING AND INSTRUCTION MANUAL:








b) Assembly drawings.

c) Cross sectional view of the voltage transformer.



f) Magnetising curves.g) Wiring diagram with polarity mark.







in his opinion is necessary to describe the equipment in full detail.





16. SPARE PARTS:

A list of the spare parts recommended for five years operation of the PT shall be

furnished with the tender. The purchaser shall decide the actual quantity of spare parts


in Schedule - III.









19. ERECTION & SUPERVISION:-





However, if it is decided to the erection of the above equipment departmentally, the

tenderer shall furnish full and detailed instructions complete with drawings andleaflets to enable the satisfactory erection and commissioning of the equipment by the



special tools necessary for erection. Details of such tools and the prices thereof shall

be stated in the tender separately.


Guaranteed technical particulars as called for in Schedule-I shall be furnished along










service as per proforma given in schedule - IV.

22. SCHEDULE OF REQUIREMENT:

Sl. No. Rated transformation ratio/core Quantity

1 Single phase 33000V/√3 : 110V/√3 – 110V/√3voltage transformer complete with protection

fuses, terminal boxes and terminal connectors

as detailed in specification.

39 Nos

2 Junction box with sufficient numbers of

terminals as detail in specification

3 Steel mounting structures for the above voltage

transformer

4 Special tools for erection

5 Spares as recommended for satisfactory

operation





found short/damaged shall be replaced by the supplier at no extra cost to the purchaser.






SCHEDULE-I


1. Type





Winding I

Winding II

6. Rated burden VAWinding I

Winding II

7. Accuracy class

Winding I

Winding II



10. Temp.rise for item 9 above. °C


KV(Rms)


KV(Rms)

13.

1.2/50 micro second impulse wave withstand test voltage KV(Peak)


KV(Rms)



a) Voltage by 1%










(c) Overall dimension. mm

(d) Mounting detail





Stamp.






SCHEDULE - II



Sl.

No

.


by the

tenderer

`1 2 3 4



No.


deviation.

-----------------------------------------------------------------------------

CERTIFICATE :The tenderer hereby certify that the above mentioned are the only deviation

from the purchaser specification.



Stamp.






SCHEDULE - III





Stamp.






SCHEDULE - IV

SCHEDULE OF INSTALLATION

Sl.No. Name & brief description of

installation

Customer Year of supply



Stamp.






SCHEDULE-V

SCHEDULE OF PRICES



S l . N o .

Description U n i t

Q u a n t i t y

E x - W o r k

R a t e ( P )

E x c i s e D u t y

( P )

T a x

( P )

F r e i g h t

&

I n s u r a n c e

( P )

U n i t R a t e

F O R


( P )

T o t a l

A m o u n t ( P )

( i )(ii) ( i i i )

( i v )


(ix)=(v)+

(vi)+(vii)+

(viii) ( x

) = ( i v )

x ( i x )

1 Single phase 33000V/√3: 110V/√3 – 110V/√3voltage transformer


fuses, terminal boxes,

junction boxes and


detailed in ‘Schedule of Requirements’

N o s .

2 Mounting steel structures S e t 4 Tools, spanners and

other plants and

equipments for erection S e t

5 Itemised prices and

quantities of

recommended spare

parts for satisfactory

operation of the

equipment for 5 years.

S e t

6 Erection and

commissioning charges

for the above

equipments.

7 Number of supervisory

personnel recommended

for satisfactory

supervision of erection

and commissioning incase only the supervision






of erection,

commissioning is

entrusted to the

contractor, along with

the daily charges for the

services of eachsupervisory staff.



Stamp.





Section –VI (132KV CT)


1. SCOPE:

This specification covers the design, manufacture and assembly, testing atmanufacturer’s works site, supply& delivery at site of outdoor and indoor current

transformer required for metering and current protection including differential

protection of transformer/distance protection of lines.



as follows:






Seismic Zone : V


3. STANDARDS:







transformer



7.0 IS 13947 (Part I),

IS 12063





connectors










articles


polluted conditions






4. TYPE AND RATING:

1. The current transformers shall be outdoor type, single phase, oil immersed,

self cooled and suitable for operation under the climatic conditions obtaining at site.







vi) Rated short time thermal current 31.5kA for 1 sec




b ) 1 minute power frequency withstand

voltage 275KVrms

viii) Minimum creepage distance 3625 mm







characteristics.

Sl.

No.

Rated

transformation

ratio/core

Accuracy

class at

all ratios

Rated

Burden

at allratios

Accuracy limit

factor/instrument


Knee point

voltage at

all ratios Purpose.

1.0 600-400

/1/1/1A

Core-I 0.2s 30 VA ISF ≤ 3.5 - Metering


protection.

Core-III PS - - 70R CT + 600Distance

protection

4. The characteristics of the core classified as PS of the above CT are based oncertain protections assumed and expected to hold good. In case need arises to co-








ambient temperature at site and that given in the standard. They shall withstand thethermal, electrical and mechanical stresses caused by specified symmetrical RMS



6. DESIGN FEATURES:

01. GENERAL:

The current transformers shall be single phase, oil immersed and self cooled

type, suitable for the services indicated and conforming to the best modern

practice of design and manufacture. The design of current transformers shall

be such that its accuracy shall not be affected by the presence of pollution on

the external surface of its insulators.











02. CORES:





saturation factor low enough not to cause any damage to meters and

instruments in the event of maximum short circuit currents.




03. WINDINGS:

Primary winding consisting of suitable number and size of conductors shall beinsulated with special paper having high mechanical strength, high electrical



The rating of the secondary windings shall be one Ampere. The secondary




damage. Suitably insulated copper wire of electrolytic grade shall be used for

secondary windings.

04. TANK:

Each current transformer shall be of Live Tank type to be supplied filled with

insulating oil and shall be hermetically sealed to prevent atmosphere from




Both expansion chamber and tank of the current transformer shall be made of

high quality steel and shall be able to withstand full vacuum and pressureoccurring during transit, and thermal and mechanical stresses resulting from



















by the purchaser for connection to the station earth mat. The earthingterminals shall be provided complete with adequate size washers, nuts and

bolts.






Appropriate number of terminal connectors suitable for ACSR Zebra /Panther conductor shall be supplied. Suitable terminal connectors for earth connections

shall also be supplied.

06. BUSHINGS:



be made of homogeneous, vitreous porcelain of high mechanical and dielectric

strength. Glazing of porcelain shall be of uniform brown or dark brown colour


particles.


the conditions under which they will be used and shall be designed to prevent






system voltage there will be no electric discharge between the conductors and bushings. No corrosion or injury would be cause to conductor, insulation or








be hot dip galvanised. A terminal board for short circuiting of secondaryterminals shall be provided.






Cable box alongwith necessary glands for receiving control cables suitable for

mounting on the bottom plate of the terminal box shall be included in the

scope of supply.


terminal box so as to permit easy access to the secondary terminals. The door shall have suitable arrangement to check ingress of moisture into the terminal

box.






each circuit. The junction box shall be weather proof type suitable for mounting on the steel structure.

The terminal boxes and junction boxes shall be suitable for outdoor

installation and shall conform to IP55 protection class.






Each current transformer shall be provided with a pressure relieving device so

as to prevent bursting of current transformer even under unfavourable

conditions.

10. OIL DRAIN COCK:

















8. RATING PLATE:

Each current transformer shall be provided with a non-corrosive rating plate inaccordance with latest edition of IS: 2705 Part-I. Following additional particulars




terms of IS: 2705.






and metering.

9. INSULATING OIL:




10. TESTS:

ROUTINE TESTS:

Each current transformer shall be subjected to routine tests as specified in the latest

edition of IS: 2705 (Part I to IV). If the purchaser wishes to have a representative,







(e) Partial discharge tests






(f) Determination of errors or other characteristics according to the



(g) Knee-point voltage and exciting current for PS Class cores

(h) Secondary winding resistance for PS Class cores

(i) Turns ratio for PS Class cores

TYPE TESTS:





The type tests shall be in accordance with the latest edition of IS: 2705 (Part I to IV),

and shall consist of the following:

(a) Short-time current test


(c) Determination of errors or other characteristics according to the








SPECIAL TESTS:



b. Measurement of dielectric dissipation factor for oil immersed current

transformers

c. Mechanical test









As soon as possible after the award of the contract, the manufacturer shall supply sixcopies of the following drawings which shall describe the equipment in full details for


drawings, one of which shall be autopositive/soft copy suitable for reproduction.

i. Outline dimensional drawings.










(including one reproducible on soft copy) of the completion drawings. Six copies of

instruction manuals covering instruction for installation and maintenance check tests


12. SPARE PARTS:











in Schedule-III, in the absence of which it shall be presumed that the provisions of thespecification are complied with by the tenderer.











However, if it is decided to do the erection of the above equipment departmentally,

the tenderer shall furnish full and detailed instructions complete with drawings and

leaflets to enable the satisfactory erection and commissioning of the equipment by the








likely to be rejected. Particulars which are not subject to guarantee shall be clearly

marked.



service as per proforma given in Schedule-IV.






purchaser.


1. 132 KV single phase, outdoor type current transformers as specified in thespecification above and rating details as per Clause 4.3 and as mentioned below:


ratio/coreQuantity

1.0 600-400 /1/1/1A 36 Nos






SCHEDULE-I










lagging PF (VA):








at 75°C (Ω):

























16 Class of oil:


provided (Yes/No):








(mm x mm x mm):


24




Stamp.






SCHEDULE-II

SCHEDULE OF PRICES



S l . N o .

Description U n i t

Q u a n t i t y

E x - W o r k

R a t e ( P )

E x c i s e D u t y

( P )

T a x

( P )

F r e i g h t

&

I n s u r a n c e

( P )

U n i t R a t e

F O R


( P )

T o t a l

A m o u n t ( P )

( i ) (ii) ( i i i ) ( i v )


(ix)=(v)+

(vi)+(vii)+

(viii) ( x

) = ( i v )

x ( i x )


outdoor, oil filled current



junction boxes and



Requirements’

a 600-400 /1/1/1A

N

o s

33



Stamp.






SCHEDULE-III


Sl. No. Specification Clause No. Details of deviation Justification for

deviation.



Stamp.






SCHEDULE-V


Sl.

No.




Stamp.





Section –VII (132KV VT)

SPECIFICATION FOR 132KV VOLTAGE TRANSFORMER

1. SCOPE:

This specification covers the design, manufacture, assembly, testing at manufacturer’sworks, supply, delivery at site, of outdoor voltage transformers required for 132 KV

Sub-Stations and Generating Stations.



as follows:






Seismic Zone : V


3. STANDARDS:










7.0 IS 13947 (Part I),

IS 12063



8.0 IEC 60044 - 2 Voltage transformers


connectors










articles


polluted conditions






4. TYPE AND RATING:

a. The voltage transformer shall be single phase, oil immersed, self cooled, core








v) Ratio : 132/√3 KV: 110/√3V- 110V/√3


vii) Rated burden:




(a) Winding I : 0.2 as per IS 11448

(b) Winding II : 3P as per IS 11448/IEC60044-2

ix) Power frequency withstand voltage


x) Lightning impulse withstand voltage : 650 KV

xi) Fault level : 25.0kA









1.5 for 30 seconds


The voltage transformers shall be complete in all respects conforming to the modern

practice for design and manufacture. The design of voltage transformers shall be such

that its accuracy shall not be affected by the presence of pollution on the external

surface of its insulators.





seismic zone.

a. CORES:

The core shall be of high grade non-ageing, electrical silicon laminated steel

of low hysteresis and eddy current losses and high permeability to ensure high


b. WINDINGS:


connected in phase to neutral with the neutral point solidly earthed. The

neutral of the system is also solidly earthed. The primary winding shall be of





windings.

c. TANK:

Each voltage transformer shall be supplied filled with insulating oil and shall be hermetically sealed to prevent atmosphere from coming into contact with

oil, avoid filtration and change of oil.




Both expansion chamber and tank of the voltage transformer shall be made of













Metal tank of the voltage transformer shall be provided with two separate




bolts.








6. BUSHING:





shall have ample insulation, mechanical strength and rigidity for the

conditions under which they will be used and shall be designed to prevent








supports by the formation of substances produced by chemical action. Theinsulation of bushing shall be coordinated with that of the voltage transformer




equivalent.


i. Bimetallic expansion type terminal connector complete with washers

bolts/nuts.







drawing of oil.




Voltage transformers shall be capable of carrying their rated burden continuously at

rated voltage and frequency without the temperature rise exceeding the limits laid









Each voltage transformer shall be provided with a pressure relieving device capable of

releasing abnormal internal pressure.

9. INSULATING OIL:

The quantity of the insulating oil for first filling of each voltage transformer and the

complete specifications of oil proposed to be used shall be stated. The oil preferably

conforms to the requirement of latest IS: 335 or equivalent IEC standard.


The voltage transformers shall be mounted on steel structures. The tenderer shall

quote separately for the supporting structures of 2.5m high each. Necessary

connecting materials, such as clamps, bolts, nuts, washers, etc. and foundation bolts

for mounting the equipment on the supporting structures shall be galvanised and shall

be supplied by the tenderer.

11.

TERMINAL CONNECTORS:

Terminal connectors suitable for ACSR Zebra conductors shall be supplied. Suitable




located to house the terminals of the two secondary windings. The terminal box shall

be outdoor type, vermint proof and shall be provided with a door in front so as to have









1100 volts grade PVC insulated, PVC sheathed multi-core 2.5 sq. mm. to 10 sq. mm.

stranded copper conductor cable.


position when supplied shall have degree of protection not less than IP55 conformingto latest issue of IS: 13947 (Part I).








13. MARKING:

i) RATING PLATE:





a) Manufacturer’s name and country of origin. b) Manufacturer’s serial number. c) Rated transformer ratio.

d) Rated frequency.




h) Highest system voltage

i) Insulation level.


The terminal marking shall identify -

a) The primary & secondary winding.

b) The winding section if any.











14. TESTS:

ROUTINE TESTS:


edition of IS: 3156 (Part I to III). If the purchaser wishes to have a representative,tests shall be performed in his presence so as to be witnessed by him.






(e) Oil leakage test

TYPE TESTS:














15. DRAWING AND INSTRUCTION MANUAL:








b) Assembly drawings.

c) Cross sectional view of the voltage transformer.



f) Magnetising curves.g) Wiring diagram with polarity mark.







in his opinion is necessary to describe the equipment in full detail.





16. SPARE PARTS:

A list of the spare parts recommended for five years operation of the PT shall be

furnished with the tender. The purchaser shall decide the actual quantity of spare parts


in Schedule - III.










Guaranteed technical particulars as called for in schedule-I shall be furnished along




Tenderer shall furnish a list of similar equipment supplied by him and presently inservice as per proforma given in schedule - IV.

21. SCHEDULE OF REQUIREMENT:-

Sl No. Rated transformation ratio/core Quantity

1

Single phase 132000V/√3: 110V/√3 - 110V/√3voltage transformer complete with protection fuses,

terminal boxes and terminal connectors as detailed

in specification.

24

2Junction box with sufficient numbers of terminals

as detail in specification

3 Spares as recommended for satisfactory operation










found short/damaged shall be replaced by the supplier at no extra cost to the purchaser.






SCHEDULE-I


1. Type





Winding I

Winding II

6. Rated burden VA

Winding I

Winding II

7. Accuracy class

Winding I

Winding II



10. Temperature rise for item 9 above. °C


KV(Rms)


KV(Rms)

13. 1.2/50 micro second impulse wave withstand test voltage KV(Peak)


KV(Rms)



a) Voltage by 1%










(c) Overall dimension. Mm

(d) Mounting detail





Stamp.






SCHEDULE - II



Sl.

No

.


by the

tenderer

`1 2 3 4



No.


deviation.

-----------------------------------------------------------------------------

CERTIFICATE :The tenderer hereby certify that the above mentioned are the only deviationfrom the purchaser specification.



Stamp.






SCHEDULE - III





Stamp.






SCHEDULE-IV

SCHEDULE OF PRICES



S l . N o .

Description U n i t

Q u a n t i t y

E x - W o r k

R a t e ( P )

E x c i s e D u t y

( P )

T a x

( P )

F r e i g h t

&

I n s u r a n c e

( P )

U n i t R a t e

F O R


( P )

T o t a l

A m o u n t ( P )

( i )(ii) ( i i i )

( i v )


(ix)=(v)+

(vi)+(vii)+

(viii) ( x

) = ( i v )

x ( i x )

1 Single phase

132000V/√3 : 110V/√3 -

110V/√3 voltagetransformer complete

with protection fuses,

terminal boxes, junction

boxes and terminal

connectors as detailed in

‘Schedule of

Requirements’

N o s .

24



Stamp.





Section –VIII (METERS)

TECHNICAL SPECIFICATIONS FOR 0.2s ACCURACY CLASS AC STATIC

TRIVECTOR ENERGY METERS, SUITABLE FOR INTER UTILITY

METERING, BULK CONSUMER METERING, RING FENCING METERING

AND AVAILABILITY BASED TARIFF (ABT) METRING

1.0 SCOPE

This specification covers the design, engineering, manufacture, assembly, inspection and testing before

supply and delivery at site/ FOR destination of class 0.2s accuracy static HT tri-vector CT/ VT operated

meters, along with other associated equipments as per details given in this specification. The meters shall

be used for commercial/ tariff metering for inter utility power flows/ bulk consumers as well for

Availability Based Tariff (ABT) application.

The meter shall comply with Indian Companion Standard (ICS) of Category B for DLMS specification.

The Category B specifies the parameters to be used for Boundary/ Bank/ Ring Fencing/ ABT metering

along with other additional features. The meter records parameters under import and or export

conditions.

One static type composite meter shall be installed for each circuit, as a self-contained device for

measurement of power transmittals, as described herein, in each successive 15 minute block, and certain

other functions, detailed in the following paragraphs.

The metering system shall be housed in rack with draw out type feature capability for inserting the meter

module. Current terminal connection must be shorted when module is drawn out.

The meter shall have 1A/ 5A secondary current support with maximum current up to 200% of Ibasic.

Meter required with 3 phase 4 wire or 3 phase 3 wire connection type with corresponding secondary CT

value to be commissioned at each substation shall be informed to the successful bidders.

It is not the intent to specify completely herein all the details of the design and construction of material.

The material shall, however, conform in all respects to the best industry standards of engineering, design

and workmanship and shall be capable of performing for continuous commercial operation in a manner

acceptable to the purchaser The offered equipment shall be complete in all respects including all

components/ accessories for effective and trouble free operation according to the specifications. Such

components shall be deemed to be within the scope of this specification irrespective of whether those are

specifically brought out or not.

2.0 APPLICABLE STANDARDS

2.1 STANDARDS

The equipment shall conform (for testing, performance and accuracy) in all respects the relevant Indian/

International metering standards with latest amendments thereof unless otherwise specified.






S. No. Standard No. Title

1 IEC 62053-22 AC Static meters for active energy, class 0.2s & 0.5s

2 IEC 62053-23 AC Static meters for reactive energy

3 CBIP technical report no. 304 Specification for AC static electricity energy meters

Immunity against magnetic interference up to 0.27T4 IS 14697-1999 AC static transformer operated Watt-hour and VAR-hour

meters for class 0.2s and 0.5s

5 IEC 60297 Dimensions of mechanical structures of 482.6 mm (19”)

series – Panels and Racks

6 BIS ICS DLMS companion

standard ETD13 (6211)

AC static transformer operated Watthour and VAR hour

meters for class 0.2s Category B (ABT compliant) metering

2.2 STANDARDS FOR METER READING INSTRUMENT

The Meter Reading Instrument (CMRI) shall conform in all respects to the following standards:

S. No. Standard No. Title

CBIP technical report no 111with latest amendment

Specification for Common Meter Reading Instrument

1.3 Equipments matching with requirements of other national or international standard which ensure

equal or better performance than the standards mentioned above shall also be considered. When the

equipment offered by the bidder conforms to standards other than those specified above, salient

points of difference between standards adopted and standards specified in this specification shall

beclearly brought out in the relevant schedule and copy of such standards along with their English

translation shall invariably be furnished along with the offer.

3.0 CLIMATIC CONDITIONS

The meters to be supplied against this specification shall be required to operate satisfactorily and

continuously under the following tropical conditions of hot, humid, dusty, rust and fungus p roneenvironment.

i) Max. ambient air temperature (°C) : 50

ii) Min. ambient air temperature (°C) : (-) 5

iii) Average daily ambient air temp. (°C ) : 32

iv)

Max. Relative Humidity (% ) : 95v) Min. Relative Humidity (% ) : 10

vi) Max. Altitude above mean sea level (m) : 1000

vii) Average Annual Rainfall (mm) : 1200

viii) Max. wind pressure (Kg/Sq.m) : 195

ix) Isoceraunic level (days per year) : 50

x) Seismic level (Horizontal Accn. in g) : 0.3






4.0 PRINCIPAL PARAMETERS

The energy meters shall be indoor type connected with the secondary side of outdoor current and voltage

transformers and mounted in control and relay panels

S. No. Item Specification

1 Type of Installation Indoor panel/ cubicle mounted

2 VT secondary 3x110/√3 V Phase to Neutral (3P4W) or 3x110 V Phase to Phase (3P3W)

Variation -30% to +15%

3 CT secondary 3 x /-1 Amps or 3 x /-5

4 Auxiliary AC/ DC Supply 110/ 220V (+ 20%)

5 System frequency 50HZ +/- 5%

6 Earthing System Solidly Grounded

The meter should be suitable for working with above supply variations without damage and withoutdegradation of its metrological characteristics.

5.0 TECHNICAL REQUIREMENTS

5.1 DISPLAY

The meter shall have Graphical LCD with backlight for proper depicting of values in user friendly

manner like graphs, values with unit, OBIS codes etc.

5.2 POWER FACTOR RANGE

The metering system shall be suitable for full power factor range from zero (lagging) through unity to

zero (leading). The metering module shall work as an active energy import and export meter along

with reactive (lag and lead) meter. The energy measurement should be true four quadrant type.

5.3 ACCURACY

Class of accuracy of the metering system shall be 0.2s for energy measurement. Each metering module

should have a built-in calendar and clock having an accuracy of 1 min per month or better. Then the

calendar and clock shall be sets at the manufacturer‟s work. The accuracy should not drift with time.

5.4 POWER CONSUMPTION OF METER

i) The meter must be capable to operate with the power drawn from the Auxiliary Power supply

(AC/DC) instead of Station VT power supply.

ii) Voltage Circuit: The active and apparent power consumption in each voltage circuit including

the power supply of metering module at reference voltage, reference temperature and reference

frequency shall not exceed 1 Watt per phase and 1 VA per phase respectively.

iii) Current Circuit: The apparent power taken by each current circuit at basic current, reference

frequency and reference temperature shall not exceed 1 VA per phase.

5.5 STARTING CURRENT

The metering module should start registering the energy at 0.1% Ib and unity power factor.

5.6 MAXIMUM CURRENT

The rated maximum current of the metering module shall be 200% of basic current (Ib).

5.7 The meter shall work accurately irrespective of phase sequence of the mains supply.

5.8 GENERAL CONSTRUCTIONAL REQUIREMENTS

Meters shall be designed and constructed in such a way so as to avoid causing any danger during use

and under normal conditions. However the following should be ensured:






1) Personnel safety against electric shock

2) Personnel safety against effects of excessive temperature

3) Protection against spread of fire

4) Protection against penetration of solid objects, dust and water in normal working

condition.

All the materials and electronic power components used in the manufacture of the meters shall be of

highest quality and reputed make to ensure higher reliability, longer life and sustained accuracy.

The meters shall be designed with application specific integrated circuits. The electronic components

shall be mounted on the printed circuit board using latest Surface Mount Technology (SMT).

All insulating materials used in the construction of meters shall be non-hygroscopic, non-aging and of

tested quality. All parts that are likely to develop corrosion shall be effectively protected against

corrosion by providing suitable protective coating.

The metering system when mounted in panel shall conform to the degree of protection IP51 in the

normal working condition of IS 12063/ IEC 529 for protection against ingress of dust and moisture.

5.9 MANUFACTURING ACTIVITIES

Meter should be manufactured using SMT (Surface Mount Technology) components and by

deploying automatic SMT pick and place machine and reflow solder process; the Bidder should own

such facilities.

1) Quality should be ensured at the following stages:2) At PCB manufacturing stage, each board shall be subjected to computerized bare board

testing.

3) At insertion stage all components should under go computerized testing for conforming to

design parameters and orientation.

4) Complete assembled and soldered PCB should under go functional testing using AutomaticTest Equipment.

5) Prior to final testing and calibration, all meters shall be subjected to accelerated ageing test

to eliminate infant morality.

6) The calibration of meters shall be done in-house.

5.10 SEALING

Proper sealing arrangement shall be provided in metering system as follows:

1) Two numbers sealing screws shall be provided on the front cover of metering module.

2) Provision shall be available to seal the back connections on the metering rack using the back

plate.

3) Provision shall be available to seal optical port.

The sealing arrangement should be suitable for application of Polycarbonate seals.

5.11 MARKING OF METER

The marking on every meter shall be in accordance with IS 14697/ IEC62053-22. The basic marking

on the metering module name plate shall be as follows:






i) Manufacturer‟s name and trade mark

ii) Serial Number

iii) Year of manufacture

iv) Type Designation

v) Number of phases and wires

vi) VT commissioning information

vii) CT commissioning information

viii) Reference frequency

ix) Accuracy Class

Additionally, following information shall also be available on name plate.

i) Property Of “Purchaser name”

ii) P.O. No. “Number”

5.12 The connection diagram of connecting the meter shall be depicted via suitable sticker pasted on

meter. The meter terminals shall be properly marked to identify voltage, Current, Auxiliary and

communication ports.

5.13 The meters shall be suitable for being connected directly through its terminals to VT‟s having a rated

secondary line- to- line voltage of 110 V, and to CTs having a rated secondary current of 1A or 5A. Any

further transformers/ transducers required for their functioning shall be in-built in the meters. Necessary

isolation and/or suppression shall also be built-in, for protecting the meters from surges and voltage spikes

that occur in the VT and CT circuits of extra high voltage switchyards.

5.14 The active energy measurement shall be carried out on 3 phase, 4 wire principle with an accuracy as

per class 0.2s of IEC 62053-22. The meters shall compute the active energy and load import; active energy

and load export from the substation bus bars during each successive 15 minute integration period block

and store it in its non volatile memory.

5.15 The meter shall compute the average frequency during each successive 15 minute block and store in

its memory.

5.16 The meter shall have Inputs/ Outputs pulsing pins availability. This shall help in transferring the

suitable energy parameters being recorded inside the meters on pulse output as well for SCADA

application at remote site.

5.17 The meter shall compute the reactive power on 3-phase, 4-wire principle, with an accuracy as per

relevant IS/ IEC standards, and integrate the reactive energy algebraically into two separate reactive

energy registers, one for the period for which the average RMS voltage is greater than 103% (Reactive

High), and the other for the period for which the average RMS voltage is below 97.0% (Reactive Low).

When lagging reactive power is being sent out from substations bus bars, reactive registers shall move

forward. When reactive power flow is in the reverse direction, reactive registers shall move backwards.






5.18 Further, the reactive energy shall also be available in four different registers as

i) Reactive import while active import

ii) Reactive import while active export

iii)

Reactive export while active importiv) Reactive export while active export.

5.19 Active and Apparent energies shall also be made available by meter in separate energy registers as –

i) Active energy Import

ii) Active energy Export

iii) Apparent energy (while active import)

iv) Apparent energy (while active export)

5.20 Meter shall have provision to compute apparent energy based on lag only or lag+lead. The same shall

be configured at factory end.

5.21 The meters shall be compatible with ABT tariff as well as TOD tariff.

5.22 For reactive power and reactive energy measurement, limits of errors in all the four quadrants shall

be in accordance to IEC 62053-23/ IS14697.

5.23 Each meter shall have a calibration LED (visual) for checking the accuracy of active energy

measurement. Further, it shall be possible to switch over the same test output device to reactive energy via

suitable means provided on the metering system. This LED shall be visible from the front side.

5.24 The metering system shall normally operate with the power drawn through the auxiliary AC or DC

supply. The metering system design should enable the auxiliary supply to be switched automatically

between the AC and DC voltage, depending upon their availability. Typical auxiliary voltages available

are 110V AC and 110/ 220V DC. The system shall continue to work even if any one of the above

auxiliary supply (AC/ DC) is present.

5.25 Each metering module shall have a built-in calendar and clock, having an accuracy of one (1) minute

per month or better. The calendar and clock shall be correctly set at the manufacturer‟s works. An

automatic backup for continued operation of the meter‟s calendar -clock shall be provided through a long

life battery, which shall be capable of supplying the required power for at least two years under meter un-

powered conditions. The meters shall be supplied duly fitted with the batteries, which shall not require to

be changed for at least ten years, as long as total supply interruption does not exceed two years.

5.26 TOD (Time of day registers): The meter shall have TOD registers for active energy import and

export, apparent energy import and export and apparent MD import and export. Maximum eight time of

day registers including universal (0-24 hrs) register can be defined. It shall be possible to program number






of TOD registers and TOD timings through suitable high level software/ MRI as an authenticated

transaction.

5.27 Maximum Demand (MD) Registration: The meter shall continuously monitor and calculate the

average demand of configured parameter during the integration period set and the maximum, out of theseshall be stored along with date and time when it occurred in the meter memory. The maximum demand

shall be computed on fixed block principle. The maximum registered value shall be made available in

meter readings. The integration period shall be set as 15 minutes that shall be capable to change to other

integration period (30/ 60 minutes), if required, through suitable high level software/ MRI as an

authenticated transaction.

5.28 Maximum Demand Reset: Following provisions shall be available for MD reset in meter –

i)

Auto billing at predefined date and timeii) Manual via common MD reset button (optional)

iii) Authenticated transaction through suitable high level software/ MRI (optional)

5.29 The display shall be of Graphical LCD type with colored back-lit and soft push button. Individual

display shall be provided for all the meters housed in a metering rack. The display shall indicate direct

values (i.e. without having to apply any multiplying factor) of measured/ computed parameters as per the

meter commissioning. It should be possible to easily identify the single or multiple displayed parameters

through legends on the metering system display like OBIS codes etc. The register shall be able to record

and display starting from zero, for a minimum of 1500 hours, the energy corresponding to rated maximum

current at reference voltage and unity power factor. The register shall not roll over in between this

duration.

5.30 Each of the metering module shall display on demand & in Auto scroll mode the following

quantities/ parameters:

i) LCD segment check

ii) Date

iii) Time

iv) Cumulative active energy import

v) Cumulative active energy export

vi) Cumulative net active energy

vii) Cumulative reactive energy lag while active import

viii) Cumulative reactive energy lead while active import

ix) Cumulative reactive energy lag while active export

x) Cumulative reactive energy lead while active export

xi) Cumulative apparent energy (while active import)

xii) Cumulative apparent energy (while active export)






xiii) Cumulative Reactive High energy

xiv) Cumulative Reactive Low energy

xv) Last 15 minutes block average of active import energy

xvi) Last 15 minutes block average of active export energy

xvii) Last 15 minutes block average of the net active energy

xviii) Last 15 minutes block average frequency

xix) MD reset count

xx) Maximum demand apparent (while active import) for current month (0-24 hrs)

xxi) Maximum demand apparent (while active export) for current month (0-24 hrs)

xxii) Cumulative active import energy reading of predefined date and time for monthly billing

purpose

xxiii) Cumulative active export energy reading of predefined date and time for monthly billing

purpose

xxiv) Cumulative net active energy reading of predefined date and time for billing purpose

xxv) Cumulative apparent energy (while active import) reading of predefined date and time for

monthly billing purpose

xxvi) Cumulative apparent energy (while active export) reading of predefined date and time for

monthly billing purpose

xxvii) Maximum demand for apparent (while active import) of predefined date and time for monthly

billing purpose

xxviii) Maximum demand for apparent (while active export) of predefined date and time for monthly

billing purposexxix) Present anomaly status

xxx) Date of first occurrence of anomaly

xxxi) Time of first occurrence of anomaly

xxxii) Time of last restoration of anomaly

xxxiii) Date of last restoration of anomaly

xxxiv) Total anomaly count

There should be a facility to configure the display parameters in favourite pages.

5.31 Load Survey: Each metering module shall have a non-volatile memory in which the following shall

be automatically stored for each successive fifteen (15) minute block:

i) Active import

ii) Active export

iii) Average frequency

iv) Apparent while active import

v) Apparent while active export

vi) Reactive High energy

vii) Reactive Low energy






viii) Average line voltage

ix) Average line current

15-minute average of the above parameters shall be available for last thirty five (35) days. It shall

be possible to select either energy or demand view at Base Computer Software (BCS) end. Theload survey data should be available in the form of bar charts as well as in spreadsheets. The BCS

shall have the facility to give complete time synchronized load survey data both in numeric and

graphic form.

5.32 Billing parameters: The predefined date and time for registering the billing parameters of shall be

00.00 hours of the first day of each calendar (billing) month. Each meter shall store the following

parameters corresponding to defined bill dates for up to last six (6) months:

i)

Active energy importii) Active energy export

iii) Apparent energy (while active import)

iv) Apparent energy (while active export)

v) Maximum demand Apparent (while active import)

vi) Maximum demand Apparent (while active export)

5.33 Daily midnight parameters: The metering modules shall store following end day parameters for last

thirty five (35) days:

i) Active energy import

ii) Active energy exportiii) Reactive high energy

iv) Reactive low energy

5.34 Data Communication Capability:

The metering system should have a multiple communication ports for local reading, remote and on-line

communication facilities.

1. RS 485 port for periodic data transfer to Sub Station data logger / Computer. RS 485

communication port shall be suitable for interfacing multiple Energy Meters. It shall be

possible to download stored meter data on polling basis with the aid of a software schedule by addressing one meter at a time and downloading the stored data into the Sub Station data

logger / Computer / Data Acquisition Server.

2. Network port (TCP / IP based) for periodic transfer through communication mediums

like OFC, MPLS etc. to the Data Acquisition Server at remote station.

3. Galvanically isolated optical communication port in front of the meter for data transfer to

or from a hand held data Collection Device (Common Meter Reading Instrument „CMRI‟)

– conforming to IEC 62056 or CBIP Technical Report No. 111.






The following ports are desirable as back up means of meter data acquisition

4. RS-232 port for periodic transfer through communication mediums like

GSM/GPRS/CDMA etc.

5. A USB port which will be an integral part of meter and available at front side of meter

covered suitably for sealing purpose. This USB port shall support reputed make pen-drive

for reading the meter data as an alternate media for MRI meter reading from optical port.

The Base Computer Software should be able to schedule the pen drive for meter reading.

The protocol used shall be open protocols (DLMS and MODBUS).

5.35 Each meter shall have a unique identification code i.e. serial number, which shall be marked on

name plate as well as in its memory. Further all meters of the same model shall be totally identical in all

respects except for their unique identification codes.

5.36 The meters shall safely withstand the usual fluctuations arising during faults etc. In particular, 115%

of rated VT secondary voltage applied continuously and 190% of rated voltage applied for 3.0 seconds,

and 20 times of rated CT secondary current applied for 0.5 seconds shall not cause any damage to or

malfunctioning of the meters. Further the immunity of metering system to external magnetic field shall

be as per latest CBIP recommendations.

5.37 Each meter shall have a non volatile memory in which the parameters as mentioned in this

specification shall be stored. The non volatile memory shall retain the data for a period not less than 10

years under un-powered condition; battery back up memory shall not be treated as NVM.

5.38 Meter shall have the capability and facility to compensate for errors of external measurement

transformers i.e. CT and VT:

i. Linear compensation for measurement PT errors (ratio and phase); there shall be linear adjustment

which shall be applied across the complete measurement range of the transformer.

ii. Non-linear compensation for measurement CT errors (ratio and phase) compensation; this shall allow

multiple ratio and phase adjustments to be applied for different load points per phase input of the meter.

It should be possible to program the errors of CT and VT in meter through front optical communication

port using compatible high level software. Metering system design should support this feature and further

it shall be possible to configure & incorporate this feature in meter at later stage whenever required.

5.39 The metering modules shall be draw out type with automatic CT shorting feature so as to ease the

testing/ replacement of meters without disturbing the system.






6.0 ANOMALY DETECTION FEATURES

6.1 The meter shall have features to detect and log the occurrence and restoration of following anamolies,

along with date and time of event:

i) Phase wise Missing Potential – The meter shall detect missing potential (1 or 2 phases)

provided the line current is above a specified threshold. The voltage at that stage would

be below a specified threshold.

ii) Phase wise Current Circuit Reversal – The meter shall detect reversal of polarity

provided the current terminals are reversed. This shall be recorded for 1 or 2 phase CT

reversal.

iii) Voltage Unbalance – The meter shall detect voltage unbalance if there is unbalance in

voltages.

iv) Current Unbalance – The meter shall detect current unbalance if there is unbalance in

load conditions. Meter should ensure true system conditions before going for currentunbalance checks.

v) CT Miss – The meter shall detect current miss if the current is below a defined

threshold, provided the phase voltage is above a specified threshold.

Snapshots of phase wise voltage, phase wise active current and phase wise power factor shall be

provided with above specified anomaly events. Further, each meter module shall record the

following events along with total duration:

i)

Power On/Off – The meter shall detect power off if both the auxiliary supplies fail. Theevent shall be recorded on the next power up. At the same time power on event shall be

recorded. No snapshot shall be logged with this event.

ii) Feeder Supply Fail -This event shall be logged when feeder supply, i.e. all the voltages

goes below certain threshold. No snapshot shall be logged with this event.

6.2 Last four hundred fifty (450) events (occurrence + restoration), in total, shall be stored in the meter

memory on first in first out basis.

6.3 There shall be at least five separate compartments for logging of different type of anomalies :

Compartment No.1 100 events of Missing Potential

Compartment No.2 100 events of CT Reversal

Compartment No.3 100 events for Power Failure / Power On-Off

Compartment No.4100 events of Transaction related changes as per ICS

Category B

Compartment No.5 50 events of Magnet Interference

Once one or more compartments have become full, the last anomaly event pertaining to the same

compartment shall be entered and the earliest (first one) anomaly event should disappear. Thus, in this

manner each succeeding anomaly event shall replace the earliest recorded event, compartment wise.






Events of one compartment/ category should overwrite the events of their own compartment/ category

only. In general persistence time of 5 min. for occurrence and restoration respectively need to be

supported in meter.

6.4 Anomaly count should increase as per occurrence (not restoration) of anomaly events. Total no. of counts shall be provided on BCS.

7.0 TRANSACTIONS

The meter shall record critical events (as performed in authenticated manner) of Time set, MD reset

operation and tariff change. These events shall be logged in roll over mode for up to twenty numbers.

8.0 SELF DIAGNOSTIC FEATURE

The meter shall be capable of performing complete self diagnostic check to monitor the circuits for any

malfunctioning to ensure integrity of data in memory location all the time. The meter shall have

indications for unsatisfactory/ nonfunctioning/ malfunctioning of the following:

i) Non volatile memory

ii) RTC battery

The above malfunctioning should be flagged in the meter memory and should be made available in meter

reading data.

9.0 TYPE TEST CERTIFICATES

The meters shall be fully type tested as per relevant standards IS 14697. The type test report of the meters shall

be submitted by bidder along with the offer. Type test reports shall not be more than 2 years old.






GURANTEED TECHNICAL PARTICULARS

Sl. No. Technical Specification Requirements Bidder’s Offer

1. Manufacturer's name & Country

2. Type of Meter 3. Name and model no. of offered product

4. Standards to which meter complies

5. Accuracy classActive energy measurement

Reactive energy measurement

6. Metrology indicator provided on meter and switching facility for reactive &apparent energy

7. Variation of voltage at which systemfunctions normally

8. Minimum Starting current

9. Maximum current

10. P.F. range

11. Power consumption per phase

Voltage CircuitCurrent Circuit

12. AC and DC Auxiliary supply ratings for powering up the metering system

13. Sealing arrangement

14. Energy parameters recorded in meter

15. ABT compatibility

16. TOD compatibility

17. MD Reset provisionsAuto

Manual

18. Demand integration period

19. Load survey parameters recorded in meter

20. Billing parameters recorded in meter

21. Daily Midnight parameters recorded inmeter

22. Communication Capability for Local readingOn Line Remote reading

23. Facility of external CT/ VT error compensation

24. Anomaly detection features

25. Self diagnostics features

26. Magnetic immunity

27. Maximum nos of communication ports i.e.Optical, USB, RS232 etc.

28. DLMS Category B compliance as per IS15959

29. Product BIS & DLMS certificationnumber





Section –XI (MODEM)

TECHNICAL SPECIFICATION FOR GSM/GPRS MODEM

The offered modem shall be suitable for communication with electronic energy meter. The modem shall

be used for remote meter reading of electronic energy meters via GSM/ GPRS infrastructure with

suitable monitoring Software.

Various features of intelligent GSM / GPRS modem are described as below:

1. Power Supply Section:

a. The modem shall have three phase AC input supply and should be capable of proper

functioning within the power supply range of 50 to 540V AC, 50 Hz.

b. Withstand capacity against surges should be upto 6.0 kV.

2. Communication Interface:

a. The RS232 output shall be provided on a 9-pin female connector for connection to

electronic energy meter’s optical/ serial communication port through suitable

communication cable.

b. Communication to external world using GSM / GPRS.

3. GSM / GPRS Section:

a. The modem shall operate in Dual Band GSM 900/1800MHz. b. The modem shall be compliant with ETSI GSM Phase 2 Standard.

c. Class4 (2W) @ 900 MHz

d. Class 1 (1W) @1800 MHz

e. Circuit switch data transmission rate up to 14.4 Kbit/Sec.

f. GPRS class B and Multislot class 10 support

g. Packet Channel Support: PBCCH

h. Coding Schemes: CS1 to CS4

4. RF section:

a. SMA (F) interface shall be provided on the enclosure for Antenna connection.

b. The antenna should be of minimum 5 dbi gain.

5. SIM Card Section:

For placing the SIM Card, a SIM card holder shall be provided on the modem and shall be accessible

from outside without opening the modem enclosure.

a. The SIM Card supported shall be of 3V Interface.






b. SIM card holder shall be provided with suitable sealing provision on the device cover.

6. Network Identification Section:

a. The modem shall perform auto network registration at power up.

b. Three different coloured LEDs shall be provided on the modem which shall depict the

current functioning status.

c. Power / Network Registration / Signal strength - RED colour

d. Data transfer between Meter and Modem - Yellow colour

e. Data transfer on GSM / GPRS - Green Colour

7. IS/IEC Specifications:

The modem shall meet the following IS/IEC specifications:

1. Impulse voltage test IEC61000-4-5(95-03)

2. AC voltage test IS13779:1999

3. Insulation resistance test IS13779:1999

4. Electrostatic Discharge (ESD) IEC61000-4-2(1995-02)

5. Electromagnetic radiated HF susceptibility IEC61000-4-3(1995-02)

6. Fast transient Burst test IEC61000-4-4(1995-02)

7. Radio Interface Measurement (CS) IS6842

8.

Surge Immunity test IEC61000-4-69. Dry Heat Test IS-13779:1999

10. Cold Test IS-13779:1999

11. Damp Heat Cyclic Test IS-13779:1999

12. Vibration test IS-13779:1999

13. Shock test IS-13779:1999

14. Spring Hammer test IS-13779:1999

8. Environmental specifications:

a. Operating temperature range : -10 degrees to +55 degree

b. Humidity : 95% RH (non – condensing)

9. Mechanical Specifications:

a. Mounting Arrangement: A suitable wall mounting arrangement shall be provided.

b. The modem shall comply with IP55 rating.

c. Sealing Arrangement: The base and top cover shall have a suitable sealing arrangement

d.

The modem shall be housed in an enclosure of engineering plastic.






10. Memory:

The modem shall have minimum memory of 256 KB.

11. Functional specifications:

a. The modem should be an intelligent device and capable of providing the following

functionalities on GSM/ GPRS network with suitable AMR Software:

b. The modem should establish the communication channel between meter and Central station

software for data transfer.

c. It shall be possible to configure the modem to work with any make of meter in transparent

mode.

d. It shall be possible to configure the modem for communication media (GSM/GPRS), Baud

rate, and GPRS settings (i.e APN number, user name and password)e. Modem shall send SMS on power off and power on condition.





Section – VIII (SRS)

TECHNICAL SPECIFICATION OF SOFTWARE

Table of Contents

1. Introduction 3

1.1. Objectives 3

1.2. System Requirements 3

2. Online Data acquisition at Local station 3

2.1. Polled parameters 4

3. AMR Architecture 4

4. Online monitoring 5

4.1. Screen Display 5

4.2. Parameters acquired 5

5. Master Data entry modules 6

6. Off-line reporting modules 7

7. Login Admin 8






1. Introduction

1.1. Objectives

The purpose of this software is to perform following functions.

1. Acquire & Validate data by polling meters.

2. Store validated data in database.

3. Generate auto-refreshing online monitoring report

4. Generate historical data reports (offline) with print.

5. Ability to generate Transformation/Transmission loss report.

6. Ability to accept the data from DCD and store it in its memory

7. Display the collected data on PC’s screen, with configurable parameters on tabular views.

8. Ability to transmit 1 minute or 15 minute data through an appropriate communication

link to the control data center.

9. The Software shall ensure that absolutely no tampering of metering data possible during

the downloading/pulling by the PC.

10. Central data center will have facility to manage ABT schedules and will perform UI

charges and Energy charge calculations.

11. Central data center will have facility to generate ABT reports exportable to excel format.

1.2. System Requirements

(i) Substation

a. Intel® Xeon® X5492 (Quad Core) 3.40 GHz & 12MB Cache

1600 MHz FSB

8 GB DDR2 RAM

146GB SAS 15k rpm & 3.5" Hot Swap

1024X786 Display

MOXA RS-485/RS-232 converter.






Windows 2008 server or later

Microsoft Office.

SQL server version 2008 or later installed on same PC connected over LAN

(ii) Central data center

Application cum web server

a. Intel® Xeon® X5409 Quad Core (2No) 3.40 GHz & 12MB Cache

1600 MHz FSB

8 GB DDR2 RAM


1024X786 Display

Windows 2008 OS or later.

Database server

b. Intel® Xeon® X5409 Quad Core (2 no) 3.40 GHz & 12MB Cache

1600 MHz FSB

32 GB DDR2 RAM


1024X786 Display

SQL server 2008 or later

2. Online Data acquisition at Local/Remote station

Only MeECL meter with RS485/TCPIP connected to ABT system will only communicated

with ABT software.

Client software will work if the Local Area network is working properly. S/W will poll

meters on modbus and DLMS protocol at 1 minute and 15 minutes intervals. S/W will

validate this data and store it in database which is located at local/central station.






System shall provide necessary configuration mechanism for smooth operation of system

like:

Software configuration (installation), Database shutdown/restart

Defining monitoring location and its structure: The parameters include (but notlimited to) name, number of units and associated properties like equity, generation

capacity, line loading capacity etc.

Defining Fuel cost, customer tariffs for final gain/loss results

Defining business rule: The base for calculation of Unscheduled Interchange Charge,

Incentive etc.

User Management: Creating and managing different users, assigning rights for

performing different operations.

Maintaining alarm rules

2.1. Polled parameters

Meter data will be polled by software at every 1 minute and 15 minutes based upon

appropriate communication infrastructure/technology available and the same will be stored in

local/remote database. All ABT meter should be connected with the ABT system with RS485

converter and TCPIP.

• Instantaneous MW,

• Instantaneous MVAR,

• Instantaneous Freq,

• Previous interval KWh,

• Previous interval Freq

• 1 minute snapshot of data

• 15 minute load survey

• Read frequency will be 1 minute and 15 minutes






3. System Architecture.






4. Online monitoring

This Online (Server and Client) will be available at all stations depend on LAN cabling.

Online monitoring screen will have following details and similar format as shown.

4.1. Parameters acquired

Following parameters will be acquired on 1minute or 15 minute from interface feeder meters

Parameters Details

Block Current Block number

Start Time Current Block Start Time

Rem’n Time Remaining time in current Block

Average Frequency of block

Average Voltage of block

Instantaneous Current of block

Unscheduled interchange (UI)

MW

Block

UI=AG – SG

Total export MW

Total Million Units export

Total import MW

Total Million Units export






6. Off-line reporting modules

Following off-line reporting modules will be provided.




Column B.

Count of blocks as per condition

Column C.

Calculate sum of AG & DC in particular frequency band

= ( sum of AG / Sum of DC) * !00

Column D.

Maximum AG % of DC in particular frequency band. Same as mentioned in Basic offline

report.

Column E.

Locate maximum DC in complete day

= (average DC / Maximum DC) * 100

V. UI Performance Report. (Graph)

X Frequency

YAG%DC

7. Login Admin.

Admin Module : Last Two Login of Each User

MeteringProject Volume II

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