SPEC. NO. TATA CONSULTING ENGINEERS LIMITED SECTION : A ... 2.pdf · TCE FORM NO. 329R5 SPEC. NO....

TCE FORM NO. 329R5

SPEC. NO. TCE.6079B-B-Z-201

TATA CONSULTING ENGINEERS LIMITED SECTION : A

SCOPE OF WORK SHEET 1 OF 3

ISSUE R1

1.0 GENERAL

1.1 The proposed 33kV, Double bus, metal clad, Gas Insulated Switchgear (GIS) is required for Hooking up 3 nos. TATA Incomers and one no. Generator Incomer (future) with Existing Distribution Network for augmenting Grid Power.

2.0 BIDDER’S SCOPE OF WORK

2.1 Supply of 33kV, Double Bus, metal clad GIS and associated accessories as per specifications. The scope covers design, manufacture, inspection and testing at the VENDOR's and/or his SUB-VENDOR's works; Packing, handling and transportation to site.

2.2 Supply of Power Cable termination Kits for 33kV(E) grade cables as per SLD which will be terminated at the proposed GIS end. The scope covers design, manufacture, inspection and testing at the VENDOR's and/or his SUB-VENDOR's works; Packing, handling and transportation to site.

2.3 Erection, Site testing and commissioning of above 33 kV GIS along with accessories, including the associated main bus bars and cable termination assemblies and associated platforms (if any), supports and internal wiring etc. The electrical installation work shall comply with the latest applicable IEC standards, regulations, electricity rules & safety codes of the locality where the installation is carried out. Nothing in this specification shall be construed to relieve the Manufacturer / Supplier/ CONTRACTOR of this responsibility.

2.4 Supply and installation of Supporting Frame work, leveling screws, inspection platforms (if required) etc. shall be provided by the BIDDER to fasten the switchgear base frames to the foundation channels. BIDDER shall submit drawing showing all details of the foundation channels on the civil guide drawing.

2.5 The Proposed GIS is to be installed at 15 m Elevation from the ground level. The equipment required for installing the GIS at this elevation shall be arranged by Bidder.

2.6 The Bidder shall abide by all safety instructions as mentioned in this specification.

2.7 The Bidder shall arrange all tools, welding equipment, rigging materials, scaffolding, platforms, ladders, testing equipment, test connections and kits etc. required for complete installation, testing & commissioning of the items included in the contract work.

2.8 Training of BPCL’s personnel including O&M staff as specified.

2.9 To obtain approval/ clearance from local statutory authorities including Electrical Inspector, wherever applicable for conducting any work or for installation carried out which comes under the purview of such authorities.

2.10 Supply of commissioning and start – up spares including all tools and tackles required for commissioning of GIS Board (Bidder to furnish the list of commissioning spares and tools and tackles).

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2.11 Supply of Mandatory spares (essential spares) as listed elsewhere in the document.

2.12 Supply of maintenance tools and tackles. (Bidder shall list the same and furnish the unit rates separately)

2.13 Bidder to furnish List of recommended spares for 2 years of trouble free operation along with unit rates separately.

3.0 EQUIPMENT & SERVICES BY OTHERS

3.1 Civil works, such as making wall/slab opening and making them good, foundation of equipment, etc. However base frame for the equipment to be supplied by Bidder.

3.2 Suitable foundation channels for grouting into the PURCHASER'S foundation floor to support the switchgear assembly.

3.3 Termination of Power Cables at Other End.

3.4 Termination of Control Cables.

3.5 Air Conditioning for the Switchgear room based on heat load input from Bidder.

3.6 Power and Control Cables will be supplied and installed by others.

4.0 Drawings / Document to furnished

4.1 Along with the Bid

4.1.1 Data/ document indicated in Data Sheet-B

4.1.2 Tentative General arrangement drawing in plans & sections etc.

4.1.3 Assembly drawings and weights of main component parts.

4.1.4 Shipping drawings showing dimensions and weights of each package.

4.1.5 Descriptions literature and data on GIS construction.

4.1.6 Type Test Certificates for similar rated equipment.

4.1.7 Quality Assurance Plan for GIS

4.2 After award of Contract

4.2.1 Drawings /Document as indicated in Data Sheet-C

4.2.2 Test reports for test performed at Bidder’s work

4.2.3 Records of Operational/ Functional tests conducted at site.

4.2.4 As built drawings.

4.2.5 Quality Assurance Plan (QAP) for all items/equipment to be manufactured/ fabricated and bought out items/equipment to be supplied by sub bidders.

4.2.6 Audio/Visual Film showing GIS assembling, erection and maintenance activities like Gas filling, servicing of Breakers, Bus Bars, panel coupling etc. shall be furnished by the Supplier.

4.2.7 Instruction books/operation and maintenance manuals and spare part bulletins.

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4.2.8 Instruction manual containing following:

Erection Procedure

Testing procedure

Commissioning procedure

Operating & Maintenance procedure

Trouble shooting procedures

Records of inspection carried out at Bidder’s/Sub bidder’s works.

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TATA CONSULTING ENGINEERS LIMITED SECTION-D1

SPECIFIC REQUIREMENTS FOR 33kV GAS

INSULATED SWITCHGEAR SHEET 1 OF

ISSUE R1

1.0 INTRODUCTION

This section of the tender specification covers the Specific requirements of 33 kV Gas Insulated Switchgear (GIS).

2.0 CODES AND STANDARDS

2.1 All equipment, system and services covered under this specification shall comply with all currently applicable statutes, regulations and safety codes in the locality such as Central Electricity Authority Regulations (latest revision) in India where the equipment will be installed. The equipment and systems shall also conform to the latest version of applicable codes and standards published by the International Electro-technical Commission (IEC) on the date of bid opening. Nothing in this specification shall be construed to relieve the BIDDER of this responsibility.

2.2 GIS shall conform to the current applicable standards and codes of practice as specified in Data Sheet A. In case of conflict between the applicable reference standards and this specification, this specification shall govern.

2.3 The standards not indicated in the specification are also acceptable subject to the approval of PURCHASER / CONSULTANT, if they are established to be equal or superior to the standards indicated in the specification.

2.4 Equipment complying with other internationally accepted standards shall also be considered if they ensure performance and constructional features equivalent or superior to standards specified. In such case, the English translation of such standards shall be furnished by the Bidder along with the Bid. If such standards are acceptable to the PURCHASER/CONSULTANT, the stipulations of the English version of the Standards shall alone be binding and not the stipulations in the original language.

2.5 The metric units/SI units shall be used in all data / drawings submitted against this package.

2.6 National Standards will be acceptable only if they are established to be equal to or superior to IEC Standards. In all such cases, copies of English translation of all such standards shall be enclosed with the bid.

2.7 The deviation between standards followed by Vendor and the standards specified in this specification document shall be brought out separately as an Annex to the “Technical Deviations”.

2.8 In the event of any conflict between the codes and the standards referred to elsewhere in the specification and the requirements of this specification, more stringent of the two shall govern.

3.0 SPECIFIC REQUIREMENTS

3.1 33kV GIS shall be double bus, suitable for 2500A, 40kA for 3 sec. This

GIS will be used for 22kV system.

3.2 Internal Arc withstand capacity shall be 40kA for 1sec.

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3.3 For constructional features, refer General specifications.

3.4 GIS shall comprise of following feeders as per Single Line Diagram – Dwg. No. TCE.6079B-734-AU-3002,R0

3.5 Operating procedures for breaker, bus dis-connector, earthing switches and PT isolator shall be written on PTFE/metallic plate and affixed on front door of each panel.

3.6 2 nos. of fixed type SF6 gas detectors (with SIL-2) shall be supplied with the board and shall be fixed in GIS substation in vicinity to GIS board. The alarm from these gas detectors will be hooked up to CPP control room by other.

4.0 4 nos. Incomer from Hook Up Transformer /Gas Turbine each

comprised of following:

4.1 Circuit Breaker

4.1.1 36kV, 1600A, 40kA for 1 sec, Vacuum Circuit Breaker housed in SF6 Gas insulated compartment and complete with anti pumping feature, auxiliary contacts, closing coil, tripping coils, motorised spring charging mechanism with manual charging facility.

4.1.2 Closing and tripping coils shall be suitable for 110V DC, +10%, -15% supply.

4.1.3 2 Nos. Tripping coils shall be provided in parallel. If one trip coil fails the circuit breaker shall be operable with other trip coil. Trip Circuit Healthy (TCH) schemes shall be provided separately for both the tripping coils.

4.1.4 Spring charging motor shall be suitable for 110V DC, +/-10% supply.

4.1.5 The front panel of the circuit breaker / LT compartment shall have:

a. Mechanical push buttons for breaker close/open. b. Mechanical indications for spring charge/discharge. c. Mechanical indication for breaker ON/OFF & Spring charged indication d. Operation counter. e. Manual Spring Charging provision

4.2 Two-position motorized disconnector for busbar connection

4.2.1 1 No. Disconnector shall have two switching position ON-OFF, and shall be installed in a separate compartment, operating mechanism outside the gas compartment with motor operating mechanism and Manual operating mechanism, mechanical ON-OFF Indications, Potential Free auxiliary contacts for disconnector switch.

4.3 Three-position motorized disconnector for busbar connection

4.3.1 1 No. Disconnector shall have three switching position ON-OFF-EARTHED, shall be installed in a separate compartment, mechanism outside the gas compartment with motor operating mechanism, Manual operating mechanism, mechanical ON-OFF-EARTHED Indications, Potential Free auxiliary contacts for disconnector switch, Potential Free auxiliary contacts for earthing switch, Locking device "Feeder earthed"

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shall be possible in all positions of the three-position- switch.

Alternatively, bidder can offer distinct disconnector (2position) and Earth Switch.

4.4 Two-position motorized disconnector for Line disconnecting

4.4.1 1No. Disconnector having three switching position ON-OFF-EARTHED, shall be provided for Line disconnection and to be installed in a separate compartment, mechanism outside the gas compartment with motor operating mechanism, Manual operating mechanism, mechanical ON-OFF-EARTHED Indications, Potential Free auxiliary contacts for disconnector switch, Potential Free auxiliary contacts for earthing switch, Locking device "Feeder earthed" shall be possible in all positions of the three-position- switch. Alternate arrangement can be offered to ensure the safety against back charging of feeders.

4.5 Current transformers (CT)

4.5.1 CTs shall be Cast Resin, Vacuum impregnated or made with a better latest technology.

4.5.2 CTs shall be single-phase, inductive type, climate-independent.

4.5.3 CT secondary connection shall be done via terminal strip inside the low-voltage compartment of the panel.

4.5.4 Current transformer shall be installed outside the primary gas enclosure.

4.5.5 Rated short-time withstand current shall be 40kA for 3 sec.

4.5.6 No. of CTs, CT Ratio, Class of Accuracy and VA burden shall be as per SLD. The Knee point voltage and magnetizing current for class PS CT indicated in SLD is tentative and the same will be finalized during detailed engineering.

4.6 Potential Transformer (PT)

4.6.1 Potential Transformer shall be Cast Resin, Vacuum impregnated or made with better latest technology.

4.6.2 PTs shall be single-phase, plug-in design, inductive type, primary connection via plug-in cable link.

4.6.3 PT shall be installed outside the primary enclosure. Bidder may suggest alternate arrangement for mounting of PT.

4.6.4 CT secondary connection shall be done by means of plugs or via terminal strip inside the low-voltage compartment of the panel.

4.6.5 No. of PTs, PT Ratio, Class of Accuracy and VA burden shall be as per SLD.

4.7 Two-position manual disconnector for Voltage Transformer

4.7.1 Disconnector shall have two switching position ON-EARTH, shall be installation outside primary enclosure, with electrical (motor) and manual operating mechanism, Potential Free auxiliary contacts for disconnector switch for ON and Earth position.

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4.8 Voltage detecting System

4.8.1 Capacitive voltage detecting system at the feeder LRM system (low-resistance modified) shall be Non contact type.

4.9 Low-voltage Compartment

4.9.1 Low-voltage compartments shall be located on the panel front above the operating mechanisms of the circuit-breaker and the three-position switch and the two position switch disconnector. The electrical connections from the primary part and from panel to panel shall be made via flexible cable harnesses.

4.9.2 General bus wires shall be laid in a separate connection duct located at the top. Internal panel wires shall be laid in metal-enclosed wiring ducts. These shall be located on the left and on the right in the front part of the switchgear enclosure and shall be accessible from the front.

4.9.3 Inside the low-voltage compartment, secondary equipment shall be mounted on a rear mounting plate or on a DIN-rail system.

4.9.4 The following equipment shall be mounted on LT Compartment door / inside LT compartment/ front door.

4.9.4.1 T-N-C breaker control switch, spring return to neutral position with lost motion contacts.

4.9.4.2 Local / Remote Selector Switch (Local – from GIS, Remote – CPP control room)

4.9.4.3 Semaphore and Indicating lamps for Breaker, Isolator and earth switch position indication suitable for 110V DC +/-10% supply.

4.9.4.4 Indicating lamps for Trip, Trip circuit healthy, Trip relay coil healthy, spring charged respectively, suitable for 110V DC +/-10% supply.

4.9.4.5 Indicating lamps / Alarm for Gas pressure low for feeder compartment as well as Circuit breaker Gas compartment, suitable for 110V DC +/-10% supply.

4.9.4.6 Indicating lamp for FRD operated for each gas compartment, suitable for 110V DC +/-10% supply.

4.9.4.7 Pressure indicating Devices for each gas compartment

4.9.4.8 Pressure switches to monitor each gas compartment

4.9.4.9 Relays with flag indication shall be used instead of Red indicating lamps suitable for 240V AC supply for DC fail indication.

4.9.4.10 Illumination lamp (type CFL)

4.9.4.11 240V AC, 5/15A, switch socket shall be normal domestic type (Anchor make).

4.9.4.12 Space heater with adjustable thermostat, switch & interlocked with breaker. Heating element in Space heaters shall be with protective covering to avoid direct contact. Also supply terminals shall be suitably shrouded for human safety while working.

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4.9.4.13 Terminal block suitable for connecting 6 sq. mm. conductor for control wiring whereas Terminal blocks shall be suitable for connecting up to 16 sq. mm. conductors of incoming Cable for AC & DC Supply.

4.9.4.14 20% spare terminals shall be provided.

4.9.4.15 AC and DC Control Switches and fuses as per requirements.

4.9.4.16 MCBs with auxiliary contacts as required for VT secondary circuit and control circuits.

4.9.4.17 AC & DC Control supply failure annunciation shall be provided.

4.9.4.18 1 No. numerical relay for IDMT over current and earth fault protection, with communication port suitable for IEC61850 protocol.

4.9.4.19 1 No. numerical relay for feeder protection Relay comprising of directional and Non Direction over current and earth fault protection elements with Communication port suitable for IEC61850 protocol.

4.9.4.20 1 No. Lock out relay with 6NO+2NC hand reset contacts. (equivalent to VAJH23).

4.9.4.21 2 Nos. Trip Circuit Supervision Relays, coil suitable for 110V DC, one for each Tripping Coil shall be provided.

4.9.4.22 1 no. Digital Load Manager displaying all electrical parameters like current, voltage, frequency, kW, kWh, kVA, kVAh, kVAR, kVARh, PF, V THD, I THD, etc. along with test terminal block. The Load Manager should have remote digital communication facility with communication port suitable for Ethernet with Modbus TCP/IP protocol connectivity, shall have provision of digital inputs to communicate status of disconnectors and breakers with Energy Management System (EMS). Terminals / Communication Ports for interfacing with EMS shall be wired in one of the compartments with the help of Multicore cable / Multidrop communication cable.

4.9.4.23 1 No. Analog Ammeter with selector switch

4.9.4.24 1 No. Analog Voltmeter with selector switch

4.9.4.25 2 No. Bi-directional kW transducer (1 No. Load Shedding and Islanding scheme and 1No. for SCAP metering) suitable for 110V AC and 1 A input voltage and current respectively and 4-20mA isolated Dual output.

4.9.4.26 2 No. Bi-directional kVAR transducer (1 No. Load Shedding and Islanding scheme and 1No. for SCAP metering) suitable for 110V AC and 1 A input voltage and current respectively and 4-20mA isolated Dual output.

4.9.4.27 3 Nos. Current transducers with isolated 4-20 mA dual outputs (for SCAP metering) shall be provided.

4.9.4.28 1 No. Check Synchronising Relay, coil suitable for 110V AC.

4.9.4.29 Only Auxiliary Relays for Necessary contact multiplication as relay reliability is better than contactor.

4.9.4.30 1 No. DC failure Relay with hand reset flag, coil suitable for 110V DC and contacts suitable for 240V AC.

4.9.4.31 Hooter, suitable 240V AC for DC fail shall be provided. (common for the

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panel)

4.9.4.32 Hooter suitable for 110V DC for AC fail shall be provided. (common for the panel).

4.9.4.33 Necessary limit switches to be provided.

5.0 4 Nos. Outgoing Feeders to MRS-3 and Old 22kV GIS through current

limiting Reactor and spare feeders shall be same as Sr. No. 4 except

following:

5.1 1No. Cable differential protection Relay (eqvt. CAG34) shall be provided.

5.2 1 No. numerical relay for feeder protection Relay shall comprising of Non Direction over current and earth fault protection elements with communication port suitable for IEC61850 protocol.

6.0 6nos. Outgoing Feeders to MRS-2, CCR and DTH shall be same as Sr.

No. 4 except following:

6.1 1No. Cable differential protection Relay (HORM-4 with supervision unit) shall be provided for CCR and DHT feeders.

6.2 1No. Cable differential protection Relay (eqvt. CAG34) shall be provided for MRS-2 feeders.

6.3 Voltage Transformer shall be deleted.

6.4 1 no. manual operated 2 position switch (ON-EARTH) for VT to be deleted.

6.5 Voltmeter with selector switch shall be deleted.


6.7 Check Synchronising Relay shall be deleted.

6.8 1 No. Bi-directional kW transducer (for Load Shedding and Islanding scheme) suitable for 110V AC and 1 A input voltage and current respectively and 4-20mA isolated Dual output.

6.9 1 No. Bi-directional kVAR transducer (Load Shedding and Islanding scheme) suitable for 110V AC and 1 A input voltage and current respectively and 4-20mA isolated Dual output.

6.10 Current transducers (for SCAP metering) to be deleted.

6.11 1 No. Surge Arrestor shall be provided.

7.0 2 Nos. Bus Tie Feeders shall be same as Sr. No. 4 except following:

7.1 2 Nos. 3 position motorized switches shall be furnished (instead of 1 No.)



7.4 1 No. numerical relay for feeder protection Relay shall comprising of Non Direction over current and earth fault protection elements with

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communication port suitable for IEC61850 protocol.

7.5 1 No. Surge Arrestor shall be provided on each bus.

7.6 Check Synchronising Relay shall be deleted.


7.8 Line disconnecting switch shall be deleted.

7.9 Bi-directional kW transducers to be deleted.

7.10 Bi-directional RkVAR transducers to be deleted.

7.11 Current transducers (for SCAP metering) to be deleted.

8.0 2Nos. Bus Coupler Feeders (COBT) shall be same as Sr. No. 4

except following:

8.1 2 Nos. 3 position motorized switches shall be furnished (instead of 1 No.)




8.5 Line disconnecting switch shall be deleted.


8.7 1 No. busbar differential protection Relay shall be provided with manual Bypass facility for each bus section (4 no. bus sections) with bus bar differential CT supervision relay. Bus differential scheme for each bus section shall take care such that it does not operate during transfer of loads from one bus to another bus.

8.8 Check zone differential protection shall be provided to avoid tripping during transfer of loads from one bus to another bus. Check Zone CT supervision relay shall be provided.

8.9 Fast Acting Device or similar scheme shall be provided for bus fault protection.

9.0 4Nos. Bus PT Feeders, each shall comprised as following:

9.1 1 no. Voltage Transformer shall be provided having Ratio, class of accuracy as indicated in SLD.

9.2 1 no. manual operated 2 position switch (ON-EARTH) shall be provided.

9.3 1 no. Analog Voltmeter with selector switch shall be provided.

9.4 Necessary MCBs shall be provided with auxiliary contacts.

9.5 2 nos. Under-voltage relays to be provided for Bus PT feeders for dead bus closing facility of incomers.

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10.0 Interlocks

10.1 The combination of three-position switches, two position switches (disconnectors) and circuit-breaker shall meet the following panel-internal interlock conditions:

10.2 To prevent the switch from switching under load, the three-position switch and two position switch shall be actuated with the circuit-breaker open. (Exception with option: manual operated uninterrupted bus transfer). Transfer of load from one bus to another bus without break shall be possible.

10.3 Three-position switch and two position switch shall be mutually interlocked so that only one can be operated. If one switching device is in the intermediate (fault position), the other shall not get actuated. Transfer of load from one bus to another bus without break shall be possible.

10.4 If the three-position switch is in the "ready-to-earth" position, the two position switch shall not be actuated.

10.5 The three-position switch shall only be brought into the ready-to-earth position if the two position switch and circuit-breaker are open.

10.6 The three-position switch shall be prevented from switching through from the CLOSED state into the "ready-to-earth" state.

10.7 Closing of the circuit-breaker shall be blocked for as long as the three-position switch and two position switch have not reached a definite final position.

10.8 All internal panel interlocks shall be mechanical. In busbar sectionalizers, additional electromagnetic interlocks are provided. If the auxiliary voltage fails, an interlocked emergency operation of the feeder is possible.

10.9 For earthing of the feeder, reliable "interrogation interlocking" must be provided: Only after the three-position switch has been switched into the "ready-to-earth" position the feeder is earthed in a short-circuit-proof way by switching in the circuit-breaker.

10.10 The feeder earthing shall be protected against "disconnection from earth":

10.11 The remote control and protective tripping facility of the circuit-breaker shall automatically become ineffective as soon as the three-position switch is switched into the "ready-to-earth" position and the feeder earthed locking device is pad-locked.

10.12 A "feeder earthed" locking device prevents the local mechanical and electrical tripping by blocking the tripping mechanism mechanically.

10.13 If cable is charged up to GIS then cable earthing switch shall not be operable to earth position.

10.14 Though interlocks are indicated above, the same will be finalized during drawing approval.

11.0 Cable Connection and Cable Termination Kits

11.1 Panel connections shall be accessible from underneath through the cable

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duct or the cable basement. Cable connections shall be designed for fully insulated inside cone connections as per DIN EN 50181. Bidder to indicate, if the cable connections supplied are other than inner cone connection.

11.2 Bar connections can be made with solid-insulated bars and with gas-insulated bars.

11.3 All incoming and outgoing feeders shall be suitable for terminating 3 nos., single core, 630sq.mm., 33kV (E), XLPE insulated armoured, copper cables per phase. However, no. of cable termination kits required for terminating the HT cables at GIS end shall be estimated based on no. of cables indicated in SLD. Cable termination kits shall not be considered for spare feeders and DHT feeders as these are feeders for future loads.

11.4 Specifications for cable termination kit shall be provided by the Bidder along with the bid.

12.0 Other requirements

12.1 All Numerical relays, digital meters Load Mangers shall be of latest version and shall have vendor support for at least 10 years.

12.2 Conformal coating on electronic cards and PCBs shall be provided at OEM works during manufacturing so as to avoid failures of cards. Conformal coating shall be G3 type coating for harsh environment as a minimum as per ANSI/ISA S71.04.1985 standard (Environment conditions for process measurement and control system, air borne contaminants) or coating for CLASS-3 environment as per IEC-654-4-1987 to cater to prevailing corrosive/humid/dusty atmosphere in the refinery.

12.3 Numerical relays shall be used for protection and metering function only and not for control functions.

12.4 Busbar dropper and breaker jaw contacts shall be rated as per breaker rating and not as per feeder load.

12.5 Panel connections shall be accessible from underneath through the cable duct or the cable basement.

12.6 Close command for all incomer breakers, COBT and Tie feeders to MRS-3 and old GIS shall be through Synchro Check relay and Dead Bus Closing shall be available. (No Auto Reclosing is envisaged).

12.7 For all sections i.e. Bus-1A, 1B, 2A and 2B, purchaser will provide separate 110V DC and 240V AC supply feeders. Suitable buscoupler switch / scheme shall be provided so that from any one of sections, AC and DC supply can be obtained in case failure of one of feeders.

12.8 Terminals / Communication Ports of Meters, Numerical Relays for protection, breaker NO and NC contacts for interfacing with EMS and Sequence Event Recorder (SER) shall be wired in one of the compartments with the help of Multicore cable / Multidrop communication cable and Ethernet switches.

12.9 A Laptop with all necessary accessories, power supply cord, data communication cords, soft ware CDs and loaded with programming

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software / data for all type of relays fitted with the GIS Board shall be supplied by the successful Bidder (GIS Panel supplier) along with the delivery of GIS” (Preferred make: IBM / DELL /LENOVO/MITSUBISHI)

13.0 SPARES

13.1 Bidder shall supply commissioning spares including all tools & tackles required for successful commissioning of GIS Board.

13.2 Bidder shall supply Mandatory spares (Bidder shall list the same and furnish the unit rates separately).

13.2.1 Portable Gas filling equipment / SF6 gas cart

13.2.2 Handle for disconnector (switch ) drive (3 Nos.)

13.2.3 Handle for earthing switch drive (3 Nos.) – if applicable

13.2.4 Hand-crank for charging circuit-breaker drive (3 Nos.)

13.2.5 Pre-selection key for three-position switch (3 Nos.)

13.2.6 Cable termination kit as specified in clause no. 11.(3 Nos.)

13.2.7 Tripping coil (3 Nos.)

13.2.8 Closing coil (3 Nos.)

13.2.9 SF6 gas (10% of total Quantity)

13.2.10 Fast Reacting Device (FRD)

13.2.11 Relays (1 No. for each type)

13.2.12 Interlocking solenoids (3 Nos.)

13.2.13 Capacitive type voltage detectors (1 no.)

13.2.14 Touch-up set (1 No.)

13.2.15 10% Extra Hardware

13.3 Bidder Supply of maintenance tools and tackles. (Bidder shall list the same and furnish the unit rates separately). Few are listed below.

13.3.1 Socket-spanner for LV-doors (3 Nos.)

13.3.2 TORX-screwdriver (3 nos.)

13.3.3 Anti Static gun (1 No.)

13.3.4 Wrenches with compression head (1000 & 630 mm) including pull-off die for cables

13.4 Bidder to furnish List of recommended spares for 2 years of trouble free operation along with unit rates separately.

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14.0 PREFERRED MAKES

Bidder can offer equivalent makes, which are subjected to BPCL/TCE

approval. The make and type will be finalised after receipt of bid.

Sl. No. Description of Equipment Vendor Name

1.0 CTs (Epoxy Resin cast type) Pragati / ABB / Silkaans / Crompton Greaves

2.0 VTs (Epoxy Resin cast type) Pragati / ABB / Silkaans / Crompton Greaves

3.0 Vacuum Circuit Breaker (VCB) ABB / Siemens / Areva

4.0 4. Indicating meters digital Conzerv / AE / Rishabh

5.0 Load Manager GE Multilin / SATEC

6.0 5. Indicating lamps (Clustered LED type)

Siemens / Teknic / Vaishno / L & T / Schneider / Binay/ concord / BCH

7.0 Push buttons Siemens / Telemecanique / Teknic / L&T / Concord / BCH

8.0 0 FRLS PVC insulated Cu Wire Finolex / Polycab / National / LAPP / RR Kabel

9.0 10 Annunciators (solid state type) Minilec / IICP / Proton Electronics/

Alstom / Yashmun

10.0 12 HRC fuse L & T / Siemens/ GE Power /

Bussman / Technoelectric

11.0 1 Auxiliary contactors Siemens / L & T / Telemecanique

12.0 1 MCB Siemens / Schneider / Legrand / Moeller

13.0 Protective relays (Numerical Type, communicable type)

ABB (R Range) / Siemens (7S Range) / GE Multilin (Universal Range) / AREVA

14.0 2 Auxiliary Relay PLA / Jyoti / Omron/ Areva / ABB / Siemens

15.0 23 Control / selector switch Kraus n Naimer / Kaycee / GE

Power controls / L&T (Salzer) / Siemens / Areva / ABB / Schneider

16.0 2 Terminals Elmex / Wago controls / Phoenix / Connectwell

17.0 Transducer AE / Sietex / MECO / Rishabh

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15.0 TESTS

15.1 PURCHASER/Consultant shall inspect the switchgear at successful bidder’s works.

15.2 Switchgear shall be subjected to routine tests as spelt out in relevant Indian Standards / IEC and typical type test certificates as per relevant Indian Standards / IEC shall be made available to purchaser/consultant.

15.3 All meters and other reference devices used for testing shall have valid calibration from reputed national laboratories/institutes.

15.4 Bidder shall furnish Type test certificates for Heat run test, Short circuit test, Impulse withstand Test for similar rated switchgear (i.e. the

switchgear type, make offered) along with the bid.

16.0 DRAWINGS AND DATA

16.1 Drawings and Data to be furnished along with the bid

16.1.1 Data/ document indicated in Data Sheet-B

16.1.2 Tentative General arrangement drawing in plans & sections etc.

16.1.3 Assembly drawings and weights of main component parts.

16.1.4 Shipping drawings showing dimensions and weights of each package.

16.1.5 Descriptions literature and data on GIS construction.

16.1.6 Type Test Certificates for similar rated equipment.

16.1.7 Quality Assurance Plan for GIS

16.2 Drawings and Data to be furnished after order placement

16.2.1 Drawings and documents as indicated in the Data Sheet-C

16.2.2 Final General Arrangement drawing showing dimensioned views, cable entry location and mounting details.

16.2.3 Schematic wiring diagram and single line diagram with power and control wiring.

16.2.4 Bill of material listing equipment designation, make, type, rating etc. of the various accessories & components used for the above equipment.

16.2.5 Test reports for test performed at Bidder’s work

16.2.6 Records of Operational/ Functional tests conducted at site.

16.2.7 As built drawings.

16.2.8 Quality Assurance Plan (QAP) for all items/equipment to be manufactured/ fabricated and bought out items/equipment to be supplied by sub bidders.

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16.2.9 Audio/Visual Film showing GIS assembling, erection and maintenance activities like Gas filling, servicing of Breakers, Bus Bars, panel coupling etc. shall be furnished by the Supplier.

16.2.10 Instruction books/operation and maintenance manuals and spare part bulletins.

16.3 Bidder shall furnish hard copies of catalogues, test reports, installation, operation and maintenance manual for all components used in GIS like relays, dis-connectors, breakers, CTs, PTs, Load Managers, Surge Arresters, termination kits etc. to the Client/Purchaser. No. of copies shall be as per the Schedule of Documents/Drawing Distribution.

16.4 Final As built Drawings shall be handed over to Purchaser with the completion of the project works as per the Schedule of Documents/Drawing Distribution.

16.5 Operating and maintenance procedures for GIS like gas filling / removal, gas pressure measurement etc shall be submitted which shall also contain safety instructions. No. of copies shall be as per the Schedule of Documents/Drawing Distribution.

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SPEC. NO TCE.6079B-B-Z-201

TATA CONSULTING ENGINEERS LIMITED SECTION : D2

GENERAL SPECIFICATIONS OF 33kV GAS

INSULATED SWITCHGEAR SHEET 1 OF 48

TCE FORM NO. 329 R5

ISSUE R1

PART-A : DESIGN, CONSTRUCTION, PERFORMANCE TESTING,

INSPECTION, PACKING AND DELIVERY OF GIS

1.0 SCOPE

1.1 This specification calls for supply of 33 kV Gas Insulated Switchgear (33 kV GIS) and associated accessories as specified herein. The scope covers design, manufacture, inspection and testing at the VENDOR's and/or his SUB-VENDOR's works; packing for shipment and delivery CIF Mumbai of equipment of non-Indian origin and ex-factory for equipment of Indian origin. Also, the VENDOR shall undertake erection, site testing and commissioning of 33 kV Gas Insulated metal clad Switchgear and accessories, including the associated main bus bars and cable termination assemblies and associated platforms, supports and internal wiring etc.

1.2 Requirement of any RC circuits for suppression of voltage spikes and Surge Arrestors, especially during Reactor switching shall be in bidder’s scope.

1.3 The intent of this specification is to provide the work enumerated to be fully complete in every detail for the function designated. It is hereby required that the BIDDER, in accepting the contract, agrees to furnish all apparatus, appliances, material not herein specifically mentioned or included, but which may be found necessary to complete, perfect or test any portion of the apparatus or equipment herein specified in a substantial manner, and in compliance with the requirements implied in this specification and without extra cost to the PURCHASER.

1.4 It is not the intent to specify completely herein, all details of design and construction of the equipment. However, the equipment shall conform in all respects to high standards of engineering design and workmanship and be capable of performing in continuous commercial operation up to the VENDOR's guarantees in a manner acceptable to the purchaser, who will interpret the meaning of drawings and specifications and shall be entitled to reject any work / material which in his judgment is not in full accordance therewith.

1.5 Whether called for specifically or not, all accessories required for normal operation of equipment are deemed to be a part of VENDOR's scope of supply.

2.0 STANDARDS

2.1 The design, material, construction, manufacture, inspection, testing and performance of 33 kV GIS shall comply with all currently applicable statutes, regulations and safety codes in the locality where the equipment will be installed. The equipment shall also conform to the latest applicable standards and codes of practice. Nothing in this specification shall be construed to relieve the VENDOR of this responsibility.

2.2 In the event of any conflict between Codes and Standards referred to elsewhere in the specification, the specification Section D1 shall govern.

3.0 TYPE & RATING

The 33 kV GIS shall comprise, three phase / isolated phase copper double

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bus bars, circuit breakers, isolators, earth switches, CTs, VTs, Surge Arresters and other accessories with rating and electrical characteristics as given in the specific requirements.

4.0 Availability Requirements :

4.1 The gas insulated switchgear and accessories shall be designed for maximum reliability and availability.

4.2 The BIDDER shall ensure and specifically confirm that failure of any one component in a circuit and the subsequent repair/testing shall not require shut down/outage of any other circuit of the GIS.

4.3 It shall be possible to remove a component of the GIS without requiring the dismantling/shutdown of any other circuit of the GIS.

4.4 The design ambient temperature considered for continuous rating of the equipment shall be 45deg.C.

4.5 It shall be possible to interchange various bays. Bidders shall clearly bring out the modifications required to be carried out for interchanging/converting incomer/transformer bays and outgoing feeder bays.

4.6 The GIS shall be designed in such a way that in order to attend gas leakage in any compartment the outage shall be restricted to minimum panel / concerned bus section instead of taking complete outage of GIS.

5.0 Layout Requirements :

5.1 It is intended that the GIS shall be located indoors at an elevation of 15m.

5.2 The GIS will be mounted on concrete foundations prepared by the other. Bidder shall indicate tolerance requirement of the foundation. Any necessary supporting framework and base plates shall be provided by the BIDDER. Mounting details for this framework shall be enclosed with the bid.

5.3 Station ground mat will be provided by Other. Bidder shall recommend the grounding design requirement.

5.4 Bidder shall indicate recommended clearance from the top of panel to the ceiling and also material handling facility.

5.5 The BIDDER shall also indicate preferred handling arrangements for the equipment offered and the provisions to be made by the PURCHASER.

5.6 The bidder shall ensure that dimensions and weight of the largest package shipping/transport do not exceed the permissible values imposed by Transporting Authorities.

6.0 Maintenance and Operation Requirements :

6.1 PURCHASER"s Standard Practices require that Station Operator on routine inspection shall check pressure gauges, breaker and disconnect switch position, etc; from finished floor level or permanently installed platforms (bidder to indicate whether platform is required) without opening doors, covers, etc. Also, when a breaker is made available for maintenance, the Station Operator is required to disable controls from the

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breaker, carry out the earthing operation, tag the isolating switches and valves, and otherwise guarantee safe conditions. The Operator must do this without the use of fuse-pullers, screw-drivers, portable ladders or any other tools. The platforms/ ladders and associated support structures, if any, for facilitating the operator to carry out the above, shall be in BIDDER's scope of supply. Access to the isolating switches and in particular hand operated maintenance earthing switches should be easily available. All mechanisms shall be such that the manual operation can be carried out by maintenance personnel without undue inconvenience. The manual earth switches shall be suitable for convenient and comfortable operation.

6.2 Maintenance Tools

BIDDER shall give details of various tools, with price, required for maintenance, viz. SF6 gas handling unit, wrenches with compression head (1000 & 630 mm) including pull-off die for cables, and moisture measuring device, pressure gauges, SF6 gas leak detectors (with SIL-2), antistatic gun (to remove charge from the insulators), instrument for checking calibration, SF6 gas density switch, instrument for repairing and recalibrating defective SF6 gas density switch, instrument for testing and fault detection of the cards (for protection & interlocking), etc; to meet the specific maintenance and operational requirement of the GIS.

6.3 Bidder shall quote for portable SF6 gas handling unit having following features;

Extraction of air or SF6 gas from compartments and creating vacuum in the compartment.

Filling and pressurising GIS compartments to the full rated capacity.

Note: Consultant / purchaser would decide one of the proposals (SF6 Gas Cart or Portable Gas handling unit) in consultation with OEM.

6.4 Bidder shall separately quote prices for Gas Cart.

The Gas Cart shall meet following minimum requirements:

a) A pre-assembled and self-contained gas service cart which shall include all equipment required to perform the following functions:

i. Extraction of air or SF6 gas from compartments and creating

vacuum in the compartment. ii. Compression, air-cooling and injection of SF6 gas. iii. Drying and filtering of SF6 gas to remove arc induced decomposition

products or any other impurities. iv. Pressurising GIS compartments to the full rated capacity. v. Storage of SF6 gas.

b) The cart shall be complete with piping, valves, safety and relief devices, instrumentation, controls, starters for power supply and pressure hoses of suitable design, quality and length for connection to various components of GIS. Every required part of the GIS shall be accessible when gas cart is employed.

c) The cart shall be constructed sturdily with steel frame and shall have casters or wheels suitable for use indoors or outdoors. Any details of

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specific handling equipment for the cart, viz. rails or crane shall be furnished in the bid.

d) The storage capacity and operating rates of the various functions shall be selected considering requirement of each and every equipment in GIS. The storage SF6 tank of gas cart shall have adequate capacity to store SF6 gas of the largest compartment and components adjacent to it on the either side.

e) A field test to the satisfaction of the OWNER / PURCHASER shall be performed at site to establish the acceptability of the gas service cart.

f) The gas cart shall be capable of creating vacuum in the gas enclosure as required for erection/maintenance of the switchgear. The gas cart should be capable of achieving minimum 0.05 mili bar vacuum and it shall not take more than 4 hours to achieve this vacuum in the largest sized compartment of the switchgear.

g) A power supply cable of adequate length wound on a drum provided with smooth bearings shall be provided with the gas service cart

6.5 The BIDDER shall ensure that the gas cylinders and enclosures meet the requirement of Indian Statutory Authorities. The gas cylinders shall be of seamless type and shall conform to BS 5045 Part I. Welded cylinders shall not be acceptable. The valves fitted to the cylinders shall conform to IS 3224/BS341 part I. The cylinders shall be inspected and certified by either Bureau Veritas or Lloyds. All desired test reports and design data as follows shall be furnished for approval of Statutory Authorities in India at least three months prior to FOB dispatch of the gas cylinders:

a) Name of the Manufacturer and standard applicable.

b) Serial number of gas cylinders.

c) Physical tests, chemical analysis and hydraulic test results and

date of last hydraulic stretch test.

d) Material thickness certificate.

e) Details of the valves fitted to the cylinders.

f) Inspection Certificate from Bureau Veritas/Lloyds.

g) Laboratory report of gas analysis.

Filling ratio of the SF6 gas in the cylinder shall be such that the pressure developed during filling at increased temperature less than the test pressure of the cylinder.

7.0 Switchgear Assembly

The switchgear assembly shall essentially consist of following items: a. Circuit breakers b. Disconnect Switches (Isolators) and earth switches c. Voltage transformers, Current transformers and Surge Arresters d. Cable chamber for termination of Power cables along with termination

arrangement. e. Isolated or 3-phase main bus enclosures and accessories. f. SF6 gas sufficient for the entire switchgear including loss during

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installation + 10% extra SF6 gas.

7.1 The equipment offered shall be designed to operate satisfactorily and meet all requirements specified in Data Sheet A-1 and Project Information for site conditions.

7.2 The equipment shall be designed and manufactured in accordance with best engineering practice and shall be such as has been proved to be suitable for the intended purpose. Each equipment shall be provided with sufficient potential free contacts for local and remote operation / control independently.

7.3 Switchgear shall be SF6 insulated, metal clad design and shall not be affected by environmental conditions. Equipment should be so designed that even if SF6 gas pressure falls to atmospheric pressure, equipment should withstand the rated voltage of 33 kV.

7.4 The switchgear shall have degree of protection minimum IP-65 for high voltage compartments i.e. high voltage compartments shall be completely protected against accidental contact, dust tight & water jet protected. The control cabinet shall have degree of main protection IP-52.

7.5 The operating life and specification of the Gaskets used for gas sealing as well as weatherproof protection of the panels shall be furnished by the bidder.

8.0 Bus bar Chamber

8.1 GIS shall be double bus bar arrangement. The bus bar chambers shall contain bus bars of adequate size for rated current as indicated in Data Sheet-A1.

8.2 Busbars shall be three phase/ isolated phase.

9.0 33 kV Circuit Breakers

9.1.1 The circuit breakers shall be vacuum type.

9.2 The circuit breakers shall be three phase / isolated phase, metalclad type and shall have duplicate trip coils. They shall be electrically and mechanically trip free where applicable and anti-pumping with either or both of the duplicate trip circuits connected. A manual emergency trip facility is required to be provided.

9.3 The circuit breaker shall normally be suitable for remote electrical operation at DC voltage as specified in the “Specific Requirements” with either or both of the duplicate trip circuits connected.

9.4 The breaker enclosure shall have provision for easy withdrawal of the interrupter assemblies. Checking the contact condition of the interrupter elements must be possible without disturbing any other gas compartment.

9.5 The name plate shall display the actual site rating of the equipment.

9.6 In addition to breaking terminal short circuits, the breakers shall be suitable for the following duties:

(a) Disconnect cables at no load. (b) Disconnect transformers at no load.

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(c) Out of phase switching.

9.7 Circuit breakers shall be rated for the operating duty, total break and make time specified in Data Sheet-A1.

9.8 Circuit breakers shall be power operated by a motor charged spring operated mechanism. Main poles of the breaker shall be such that the design shall ensure a close pole spread with a maximum of 4 ms opening and 6 ms closing.

9.9 Main poles shall operate simultaneously. There shall be no objectionable rebound and the mechanism shall not require any critical adjustment. It shall be strong, rigid, positive and fast in operation.

9.10 Circuit breakers shall be provided with a minimum of 6 NO + 6 NC auxiliary potential free contacts exclusively for PURCHASER'S use in external interlocking circuits.

9.11 Circuit breakers shall be electrically interlocked with the isolators/earthing switches in accordance with the PURCHASER'S safety interlocking scheme.

9.12 The circuit breaker shall be electrically and mechanically trip free, where applicable, and anti-pumping with trip circuits connected. A manual trip device shall be provided to open the breaker under control DC failure condition.

9.13 The total temperature of any part of the switchgear shall not exceed the limits as specified in Table IV, Part 2 of IEC Publication No.60056 for AC Circuit Breakers, the ambient air temperature being 45 Deg. C maximum.

9.14 Facilities shall be provided with switchgear to enable timing tests to be carried out after switchgear has been charged with SF6 gas. It should not be necessary to open up any gas section to make test connections to the circuit breaker primary terminals.

9.15 The circuit breaker shall normally be suitable for remote electrical operation i.e. from CPP.

9.16 The trip circuits including intermediate trip relays and coils shall be supervised and shall give an alarm with annunciation in case of a defective trip circuit.

9.17 The maximum interrupting time at the minimum operating pressure of the mechanism shall be 3.0 cycles as specified in Data Sheet-A.

9.18 BIDDER's shall furnish proof of short circuit rating with transient voltage severity in accordance with latest revision of IEC 60056. All short circuit testing shall be carried out by direct tests or synthetic tests, in accordance with IEC 60056. Details of out of phase testing in accordance with latest versions of IEC 60056 shall be provided with the bid.

9.19 Switching Surges : It is required that the circuit breakers shall be re- strike free when de-energizing overhead lines and cables, and shall be capable of switching unloaded transformer and shunt capacitor banks without exceeding specified over-voltages.

9.20 The BIDDER is required to provide a Voltage withstand vs. Time Graph in the range of 0.5 to 1000 micro sec. which shows the guaranteed insulation

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performance for the equipment offered. If capacitance is added to line or circuit side of breaker, these values of capacitance should be included in the studies.

9.21 In case of vacuum circuit breakers, vacuum monitor device shall be supplied to aid maintenance personnel to estimate whether vacuum levels are within acceptable/ permissible limits. This device can be portable and shall be designed to permit easy connection/ disconnection with any breaker without in any manner influencing the integrity of sealing of the vacuum interrupter.

9.22 It shall be possible to quickly isolate mechanically the interrupter unit of a vacuum circuit breaker from the breaker operating mechanism for checking loss of vacuum inside the interrupter.

9.23 Vacuum circuit breaker shall be provided with a suitable metal shield for protecting the testing/ maintenance engineer from X-ray radiations emitted during high voltage testing of interrupter unit.

9.24 Discrepancy circuit shall be provided which shall detect pole position discrepancy in case of isolated phase.

9.25 A mechanical indicator shall be provided to indicate open and closed positions at a location from where it will be visible to a man standing on the ground. An operation counter shall also be provided.

9.26 A closing release shall operate correctly at all values of control voltage between 80% and 110% of the rated voltage. A shunt trip shall operate correctly under all operating conditions of the circuit breaker up to the rated breaking capacity of the circuit breaker and at all values of control supply voltage between 70% and 110% of rated voltage.

9.27 Working parts of the mechanism shall be of corrosion resisting material. Bearings which require grease shall be equipped with pressure type grease fittings. Bearing pin, bolts, nuts and other parts shall be adequately pinned or locked to prevent loosening or changing of adjustment with repeated operation of the breaker.

9.28 Provision shall be made for attaching an operation analyser to perform speed tests after installation of the breakers at site.

9.29 Spring Operated Mechanism

9.29.1 Spring operated mechanism shall be complete with motor, opening spring, closing spring with limit switch for automatic charging and all necessary accessories to make the mechanism a complete operating unit.

9.29.2 As long as power is available to the motor, a continuous sequence of closing and opening operations shall be possible.

9.29.3 After failure of power supply to the motor, at least two close-open (C-O) operations of the circuit breaker shall be possible.

9.29.4 Breaker operation shall be independent of the motor which shall be used solely for compressing the closing spring.

9.29.5 Motor rating shall be such that it requires only about 30 seconds for fully charging the closing spring.

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9.29.6 Closing action of the circuit breaker shall compress the opening spring ready for tripping.

9.29.7 When closing springs are discharged after closing a breaker, closing springs shall automatically be charged for the next operation.

9.30 Operating Mechanism Control

9.30.1 Operating mechanism shall be operable by both local / remote electrical

control. Electrical tripping shall be performed by shunt trip coils.

9.30.2 A conveniently located shrouded manual tripping lever or push button shall also be provided for local tripping of the breaker and simultaneously opening the reclosing circuit. A local manual closing device shall also be provided for maintenance purpose. Direction of motion of handle shall be clearly and indelibly marked.

9.31 Contacts

9.31.1 Main contacts shall have ample area and contact pressure for carrying the rated current and the short time rated current of the breaker without excessive temperature rise which may cause pitting or welding. Contacts shall be easily replaceable and shall have a minimum of movable parts and adjustments to accomplish these results. Main contacts shall be the first to open and the last to close so that there will be little contact burning and wear.

9.31.2 Arcing contacts, if provided, shall be the first to close and the last to open and shall be easily accessible for inspection and replacement. Tips of arcing and main contacts shall be silver faced or have tungsten alloy tipping.

10.0 CURRENT AND VOLTAGE TRANSFORMERS

10.1 General Requirements

10.1.1 Terminal and polarity marks shall be indelibly marked on each VT & CT on the associated terminals and these marks shall be in accordance with relevant standards.

10.1.2 Whenever a VT secondary winding is used for both measurement and protection application, it shall have dual accuracy class of 0.5/3P, unless otherwise specified.

10.1.3 No turns compensation shall be used in case of 'Class PS' CTs.

10.1.4 Turns compensation, if any, should be clearly brought out in the offer in guaranteed particulars.

10.1.5 In case of multi ratio CTs, the minimum specified requirements in respect of VA, accuracy and knee point voltage (KPV) and maximum secondary resistance specified shall be met at all taps.

10.1.6 Magnetizing characteristics (extending well beyond KPV) and secondary impedance values shall be furnished in guaranteed particulars for all protection cores.

10.1.7 Voltage transformers shall be of electromagnetic type. Capacitor voltage transformers shall not be acceptable.

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10.1.8 Voltage and current transformers shall be given tropicalised treatment for satisfactory operation in hot and humid climate.

10.2 Voltage Transformers

10.2.1 Voltage transformers shall be of the metal enclosed, inductive type, mounted directly on the high voltage enclosure with plug in contacts that allow easy removal.

10.2.2 Minimum accuracy, burden and transient response characteristics shall be in accordance with SLD.

10.2.3 BIDDER shall provide the VT selection scheme for outgoing feeders i.e. potential supply to protection system shall be switched to bus VT depending on position of bus side disconnect switch (power supply to the feeder and VT potential supply for protection shall be from the same bus.).

10.2.4 Voltage transformers as specified in Data Sheet A-1 shall be supplied by the BIDDER for the 33 kV main Busbars (3 Nos. 1phase VTs on each bus section). The electro-magnetic VTs shall be designed to operate satisfactorily and meet all requirements specified in Data Sheet-A1 & Section-D and shall conform to IEC-60044 -2.

10.3 Current Transformers

10.3.1 Number and Location of CTs

a) The CTs shall be provided as per SLD. b) The physical relative location of CT cores should be as per the

locations shown in the single line diagrams, to ensure overlapping of protective zones.

10.3.2 Minimum Accuracy for Relaying Cores

5P20 class, Class 1 & Class PS shall be as per Data Sheet of this specification. The relaying cores shall be of low remanence design. Gaps in the core shall not be larger than necessary to limit reminance. The core reminance shall not exceed 10% of the saturation flux that is created by the application of 10 DC ampere turns per inch length of core around the magnetic path.

10.3.3 Other CT Requirements.

a) For each type of CT, application data shall be supplied in accordance with IEC 60185.

b) Readily accessible name plate(s) shall be provided for each CT showing ratings, terminal markings and low reminence designation.

c) The position of each primary terminal in the current transformer shall be clearly marked by two plates permanently fixed to the metal cladding at each end of the current transformer section.

10.3.4 Current transformers must have secondary terminals outside the high voltage enclosure, mounted in suitable accessible terminal boxes. All secondary leads of all CTs must be wired to shorting type terminals on the terminal strip in the LT compartment of each breaker bay.

10.3.5 Current Transformers (CTs) shall be provided by the BIDDER for each phase of the 33 kV GIS as per single line diagram. The secondary terminals of CTs shall be brought out in LT compartment and facility shall be provided

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for short circuiting and earthing the CT secondary at the terminal box. The CTs shall be designed to operate satisfactorily and meet all requirements specified in Data Sheet-A1 and Section-D and shall conform to IEC 60044 -1.

11.0 33 kV Surge Arresters

11.1.1 Surge arrester to be provided on each Bus and tie feeders to MRS-3 and new GIS as per SLD.

11.1.2 The specifications and characteristics of the surge arresters shall be in accordance with the Data Sheet-A of this specification.

11.1.3 Procedure for testing the healthiness of the Surge arrestor at site shall be furnished by the vendor.

12.0 Disconnect Switches (Isolators) and Earthing Switches

12.1 The Isolators, earth switches and maintenance earth switches, as applicable, shall be complete with all parts that are necessary or essential for efficient and safe operation. Such parts shall be deemed to be within the scope of supply, whether specifically mentioned or not. Provision shall be made for remote annunciation for following:

a. Bus disconnectors On / Off indication b. Trip Circuit Healthy Indication c. Circuit breaker spring charged indication d. Circuit breaker On / Off / Trip indication

12.2 All similar parts shall be interchangeable.

12.3 The design shall be such that no lubrication of any part is required except at very infrequent intervals.

12.4 The isolator and earthing switch shall be provided with high current carrying contacts on the hinge and jaw ends and all contact surfaces shall be of silver faced copper.

12.5 Arrangement shall be provided to enable manual operation of Isolators and earth switches. Whenever the emergency manual handle is inserted into the drive mechanism, it shall not be possible to control the device electrically.

12.6 Motor operated disconnect or switches except for the earth switches for bus (Hand operated) shall be provided as indicated in single line diagram and Data Sheet-A1. Isolators shall be motor operated and controlled from local and from a remote point.

12.7 The isolators shall be capable of switching the capacitive charging current of switchgear. The bus isolator shall be capable of carrying out 500 switching (500 close + 500 open) operations at rated current without requiring maintenance.

12.8 The 3 pole group operated manual maintenance earthing switches shall be provided as indicated in single line diagram. Earth switch shall be fully interlocked with associated isolator. The indication of status of feeder earthing shall be available at switch gear panel and near cable termination.

12.9 As per conventional design the feeder earthing shall be through breaker and

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bus side 3-position switch.

12.10 A mechanical position indicating device shall be provided for each isolator/earthing switch which shall be clearly visible from ground.

12.11 A weather-proof and corrosion-proof name plate shall be provided on each isolator, earthing switch and operating devices etc. The name plates shall conform to applicable standards.

12.12 Earthing switch shall be designed in a manner to prevent transmitting of impact to earth switch bushing during high speed closing operation of the earth switch.

12.13 The earth switches shall have fault current rating as specified in Data Sheet.

12.14 Earth switches shall either be motor driven or stored energy operated and controlled from the local as specified. After removal of the ground initiated by a fault making ground switch, it must be possible to re-energize the system without first carrying out maintenance. The BIDDER shall state what precautions are taken to minimize the accidental discharge of the stored energy operating mechanisms. This will not be applicable for hand operated earth switches.

12.15 Operating Mechanism and Controls

12.15.1 Isolators shall be motor operated and controlled from the local and from a remote. Connections, interlocking requirements and auxiliary switches shall be in accordance with the PURCHASER's requirements.

12.15.2 The operating mechanism shall provide a quick, simple and effective operation. One man shall be able to operate the isolator/earthing switch (when manually operated) without undue effort.

12.15.3 The isolator shall be provided with positive continuous control throughout the entire cycle of operation. The operating pipes and rods shall be sufficiently rigid to maintain positive control under most adverse conditions and when operated in tension or compression for isolator closing. They shall also be capable of withstanding all torsion and bending stresses due to operation of the isolator.

12.15.4 In addition to the limit switch contacts required for control of power operated isolators, the sufficient number of auxiliary contacts shall be provided. These switch contacts shall be positive acting type and shall be directly driven from the isolator shaft through minimum linkages. The auxiliary contacts shall be of silver faced copper. When make before break contacts are specified, they shall be wiping type. The contacts (including limit switch contacts) shall be designed to carry 10A continuously without undue temperature rise. All contacts (including limit switch contacts) shall be suitable for breaking an inductive current of 2A at specified DC voltage.

12.15.5 A local isolating switch fuse unit for disconnection of power supply, a local/remote selector switch and a set of open/close push buttons shall be provided in the associated local control panel for motor operated isolators.

12.15.6 The control shall be arranged such that the desired operation shall be completed when corresponding push button is pressed even momentarily.

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The control circuit shall be so designed that necessary interlocks with associated breakers and earthing switch shall be incorporated in it.

12.15.7 Arrangement shall be provided to permit manual operation of isolators. The arrangements shall be such that when manual operating handle is in the engaged position, the power operation shall be made inoperative.

12.15.8 Disconnector and earthing switch mechanisms shall be able to store energy to always assure completed operations.

12.15.9 If the power supply to Isolator/ earthing switch is initially off and open/close command is given to isolator/earth switch which cannot be carried out due to non-availability of power at that moment, the operation of Isolator/Earth switch shall not take place when power supply is restored subsequently.

12.16 Short Circuit Requirements

12.16.1 The rated peak short-circuit current or the rated short time current carried by an isolator or earthing switch for the rated maximum duration of short circuit shall not cause:

a) Mechanical damage to any part of the isolator or earthing switch. b) Separation of the contacts or contact welding. c) A temperature rise likely to damage insulation.

12.16.2 After the passage of these currents, the isolator shall be able to carry its rated current under specified conditions and the operation of the operating device shall not be impaired.

12.16.3 If earthing switch is combined with an isolator as a single unit, the rated peak short circuit current and the rated short time current of the earthing switch shall be at least equal to those specified for the isolator.

13.0 Interlocks

13.1 Interlocking devices must provide absolute and positive protection against potentially harmful mal-operations of the switchgear. The following functions shall be provided:

13.1.1 Forcing the operator into the only safe and logic sequence to actuate breakers, switches, isolators and grounding switches.

13.1.2 Checking the actual fully closed or fully open position of all switching elements before and after each move.

13.1.3 Providing the logical checks and issuing the resulting PERMISSIVE or BLOCKED signals for the switchgear.

13.1.4 Indicating positively the absolute condition/position of the supervised equipment.

13.1.5 Local manual and remote electrical operation of all essential functions.

13.1.6 Local emergency unlocking facilities via safety-key switches under the full responsibility of the operator.

13.2 Isolator and earthing switch shall be electrically and mechanically interlocked such that it will not be possible to close the earthing switch when the isolator is closed or vice-versa.

13.3 Electrical interlocking arrangement shall be fail-safe type and said feature

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shall be demonstrated at site.

13.4 All interlocks required between circuit breaker, disconnect and earth switches shall be provided by the BIDDER. These shall take the form of an electrical interlock scheme operated from auxiliary switches attached to the mechanisms of the above equipment. The logic relays for this scheme shall be in BIDDER's scope of supply and shall be mounted in a local LT compartment.

14.0 Power Cable Terminations

14.1 All high voltage cables will be bottom entry type. Sufficient space must be provided at bottom of the switchgear to terminate and connect these cables. Suitable cable support and grounding facilities must be provided in this area. GIS manufacturer shall ensure that the supports of Power Cable termination chamber are designed in a manner to enable termination/ removal of the Power Cable without requiring dismantling/ removal of the Cable termination chamber or its supports.

14.2 Cable termination Kit for HV cables is in bidder’s scope.

14.3 Back-charge PT/ Capacitive voltage device (22/√3 kV / 110/√3 Volt, 0.5 class, 20 VA) shall be provided on all outgoing feeders and incomers. PT LV secondary shall be wired to drive auxiliary relay to provide safety interlock in earth switch operation and for indicating LED. MCB with auxiliary contact shall be provided for isolation of PT LV secondary. Tripping of this MCB shall be annunciated.

14.4 Cable connecting contact plates and the gas insulated terminal enclosure are part of the switchgear delivery.

14.5 Each cable feeder shall have facilities to isolate the cable end to apply a high voltage D.C. test probe for dielectric testing of the cable.

14.6 GIS manufacturer shall be responsible for complete interface with cable terminations and shall guarantee the performance of the interface with cable terminations. The onus of accommodating a mutually agreeable solution for design and testing of this interface shall be on the GIS vendor.

14.7 GIS manufacturer shall clearly indicate arrangement of connections from power cable with the GIS.

15.0 LT Compartment

15.1 The accessories and auxiliary equipment required for the correct functioning of each circuit element shall be installed in LT Compartment.

15.2 LT compartment shall also house the various relays, timers, etc. to realise various interlocks as per PURCHASER's requirement among circuit breakers, isolators and earth switches. The contacts, signals and conditions originating from/going to the gas insulated switchgear, associated auxiliary and monitoring equipment shall be wired up to the local control panel, for PURCHASER's further use.

15.3 Completely separate and isolated circuit shall be used for switchgear control, tripping, alarms and auxiliary devices. CLOSE and TRIP circuits shall be kept isolated to their final mechanical or electrical actuators. Trip

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circuits shall be individually and permanently monitored for continuity.

15.4 Each auxiliary control circuit shall be monitored and shall be protected by a two pole miniature circuit breaker with auxiliary contacts.

15.5 All accessible live connections shall be shrouded and it shall be possible to change individual fuses, switches, MCBs without danger of contact with live metal.

15.6 Adequate safety precautions shall be taken to avoid accidental contact with 415V potential.

15.7 All live parts shall be completely shielded using a halogen free fire retardant insulating material.

15.8 600V terminal blocks shall have removable covers and wiring shall be separated from other potentials.

15.9 A clear and legible warning notice carrying wording "DANGER-415V" shall be located on the enclosure door.

15.10 All control equipment shall be suitable for operating in an ambient temperature varying between +10 deg. C and +45 deg.C.

15.11 Door shall have provision for padlocking. Door shall be constructed such that they do not seize in the event of an internal fire.

15.12 All live parts shall be provided with at least phase to phase and phase to earth clearance in air of 25 mm and 20 mm respectively.

15.13 Terminal blocks for terminating all control, indication and monitoring wiring from the associated circuit element shall be provided. All terminal blocks shall be identified with marking strips. The conductor size range which the terminals can accommodate shall be clearly shown on the BIDDERS drawings. The terminal blocks used for cable connections shall be disconnecting type. All terminal blocks shall be covered by acrylic covers.

Spare connector shall be provided between connectors used for close command and trip command.

Only single tier connectors shall be used for easily terminating the control wires.

15.14 Disconnecting type terminal links shall be provided for current transformer circuits. Additional connectors with shorting facility shall be provided in CT secondary circuit for future addition or remote indication.

15.15 Terminal wiring shall be accessible from the front side of the panel.

15.16 LT compartment shall have gland plate with a provision of making cut-outs for entry of control cables.

15.17 All protection relays on LT compartment shall be mounted at eye level or above.

16.0 Control & protection Equipment

16.1 Switches/MCBs

16.1.1 Switches/MCBs shall be hand operated, air break, heavy duty, quick

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make, quick break type conforming to applicable IEC standards. All single phase MCBs for control circuit / control supply shall be of double pole type.

16.1.2 It shall be the responsibility of the Bidder to fully coordinate the overload and short circuit tripping of the MCBs with the downstream MCBs/fuses provide satisfactory discrimination.

16.1.3 For DC circuit only double pole rotating switch shall be used.

16.2 Fuses

16.2.1 Fuses shall be of HBC cartridge type (no D type screw-cap is acceptable) having a rupturing capacity of not less than 50 kA at 440V AC and 16 kA at 110V DC.

16.2.2 Fuses shall be provided with visible operation indicators to show that they have been operated.

16.3 Control & Auxiliary Power Supply

16.3.1 All control equipment shall be suitable for operation on specified DC voltage +10%,-15% system.

16.3.2 DC & AC power supply distribution shall be done in a manner which will enable isolation of individual equipment. Control supply bus shall be formed in the cubicle for all 4 bus sections and then power supply shall be distributed into individual equipment through MCBs.

16.3.3 Separate circuits with switches, fuses etc of adequate rating shall be provided for control of space heater, lighting and power receptacle etc. These shall be on 240V + / - 10 %, 1 phase, 50 Hz AC supply. Power receptacle shall be universal type 5 / 15 Amps.

16.4 Relays

16.4.1 Relays for various control, monitoring and blocking functions of a particular circuit element shall be installed in associated LT compartment. Protective relays shall be subject to transient tests and shall be approved by the PURCHASER. All relay shall have dust covers.

16.4.2 Necessary auxiliary relays for alarm, time-delay relays, voltage relays as required for control and protection shall be mounted inside the local control panel. Voltage relays shall have sufficient thermal capacity for continuous energisation, using external resistors, if necessary. Auxiliary relays shall be rated to operate satisfactorily between 80% and 110% of the rated voltage.

16.4.3 Each relay shall be provided with atleast 4 NO and 4 NC potential free contacts for the PURCHASER's use.

16.4.4 Coils of all the relays shall be adequately rated to avoid spurious operation of relays on DC system ground or induced surges. Minimum pick up current of relay coil shall be 100 milli amps.

16.4.5 All relays shall be tropicalised and suitable for maximum ambient temperature of 45 deg. C.

16.4.6 The relays shall be numerical and those are to be provided with conformal coating on electronic cards and PCBs during manufacturing so as to avoid

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failures of cards. Conformal coating shall be G3 type coating for harsh environment as a minimum as per ANSI/ISA S71.04.1985 standard (Environment conditions for process measurement and control system, air borne contaminants) or coating for CLASS-3 environment as per IEC-654-4-1987 to cater to prevailing corrosive/humid/dusty atmosphere in the refinery. For differential relays, the relay circuit shall be provided with non-linear resistor (metrosil) so as to avoid failure of relay trip coil during high through fault current.

16.4.7 Protocol for Relays shall be IEC-61850.

16.4.8 The numerical protection system offered shall have at least three years proven field experience.

16.4.9 Make and type of relay shall be subject to the PURCHASER's approval.

16.4.10 Numerical relays shall be with LCD display and MIMIC.

16.4.11 Numerical relays shall have facility of power system fault recording which can be down loaded to laptop for further analysis.

16.4.12 All numerical relays on GIS board shall be time synchronized for event logging and trouble shooting.

16.4.13 Numerical relay shall have watchdog facility so as to indicate relay healthiness / IRF (through LED).

16.5 Interior Lighting and Receptacle

16.5.1 240V, 1 phase, 50 Hz, CFL / LED lighting fixture for interior illumination shall be provided for each LT compartment with door limit switch and 240V, 1 phase, 5/15 amp. 6 pin receptacle. Power source for interior lighting and receptacles shall be completely independent of control power source.

16.6 Internal Wiring

16.6.1 All wiring shall be carried out with wires of, 1.1kV grade, 1200C rated,

stranded copper conductors. The insulation shall be fire retardant low smoke (FRLS) type, approved and tested in accordance with PURCHARSER's requirement. Power circuits shall be wired with stranded tinned copper conductors of adequate sizes to suit the rated current. Alarm and indication circuits shall be wired with stranded, tinned copper conductors of sizes not smaller than 2.5 sq.mm and shall be shielded type. CT circuits shall be wired with stranded copper conductor of size not smaller than 2.5 sq.mm.

16.6.2 Engraved identification ferrules, marked to correspond with the wiring diagram shall be fitted at both ends of each wire. All wiring shall be terminated on terminal blocks. Terminals shall be adequately rated for the circuit current the minimum rating shall be 20 A. Control wiring shall be protected against mechanical damage and shall be colour coded in accordance with PURCHASER's requirement. Colour sleeves may be used in lieu of continuous colouring. Physical separation between various colour wiring shall be maintained as much as possible.

16.6.3 The wire terminations shall be made with solderless crimping type of

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tinned copper lugs which firmly grip insulation and conduction.

16.6.4 Panel wiring shall be securely supported, neatly installed by lacing and tying, readily accessible and connected to equipment terminals and terminal blocks. Flame retardant plastic wiring channels/troughs with strap on covers shall be used for this purpose.

16.6.5 All spare contacts of relay, breaker and disconnectors auxiliary contacts shall be wired up to terminal block for future use.

17.0 Local Alarm/Annunciation

17.1 Window type alarm annunciation shall be provided for various abnormal conditions. The alarm windows should have provisions for detecting cleared and un-cleared faults and flashing for new faults.

17.2 The following abnormal conditions shall be annunciated.

17.2.1 Low gas pressure for each gas compartment of the panel.

17.2.2 Low-Low gas pressure for each gas compartment of the panel.

17.2.3 High gas pressure for each gas compartment of the panel.

17.2.4 Spring motor excessive start.

17.2.5 Spring motor run excessive.

17.2.6 Spring motor overload.

17.2.7 Spring motor circuit trouble.

17.2.8 Breaker pole discrepancy (if applicable)

17.2.9 Isolator open/close incomplete.

17.2.10 Isolator motor overload.

17.2.11 D.C. control supply failure.

17.2.12 Four spare windows.

17.3 Labels and Diagram Plate

17.3.1 Every equipment mounted on the LT compartment shall be provided with individual labels with equipment designation/rating. Also, panel shall be provided on the front with a non-rusting label engraved with the designation of the cabinet.

18.0 Constructional requirements of GIS

18.1 The equipment shall be constructed with all necessary compensators to allow for thermal expansion, and spacers or bellows with telescopic bus bars to allow for the removal of sections with the minimum of disturbance.

18.2 The system shall be complete with all necessary supports, platforms, mechanism cabinets and internal cable trays etc. Suitable maintenance/ operation platforms shall be provided.(if required)

18.3 The arrangement of equipment offered must provide adequate access for operation, testing & maintenance. The space around the cable sealing end boxes must be sufficient to allow cables to be made off or dismantled after the switchgear has been erected, without imposing bending stress at

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the cable end. Mechanism cabinet doors shall have provision for padlocking. Door shall be constructed such that they do not seize in the event of an internal fire.

18.4 The main bus-bar enclosures may be of bolted flange or welded construction. Type of construction shall be specified by BIDDER.

18.5 The equipment and connections within each compartment shall be so arranged as to allow removal and replacement of any section with minimum disturbance to adjacent pressurized sections. Provision of bus sectionalisers/detachable device/bellow etc must be made in the main bus bar for ease of removal of a bay/component.

18.6 In the event of a fault in any one element of the GIS, it is a firm requirement that subsequent repairs/testing shall be possible to be carried out without affecting any other element and outage of any other bay/circuit or bus bar shall not be required. Suitable arrangements shall be made by the bidder & clearly brought out in the bid.

18.7 Minimum assembly work shall be required during installation. Completely factory assembled switchgear bays that require only cable connections at site will be preferred.

18.8 The fully enclosed bus bars shall be made from electrolytic drawn copper alloy. These bus bars and other current carrying equipment shall be rated for the continuous current of the switchgear under the maximum ambient design temperature as indicated in project electrical information without exceeding their permissible temperature rise. The capabilities of the bus duct shall be given on a symmetrical current basis and the relevant IEC standards.

18.9 Metalcladding

18.9.1 The metalclad enclosures for the SF6 gas and circuit elements shall be made from non-magnetic material to prevent losses and heating from magnetic hysteresis in the case of single-phase enclosures. The type of material and thickness shall also be such as to keep heating due to induced circulating currents to a minimum.

18.9.2 Each enclosure shall be tested to withstand twice rated internal operating pressure, as a routine test free of cost to the Purchaser.

18.9.3 Enclosure shall comply with test as per IEC /IS to withstand the full rated fault currents during arcing faults at 40 kA, without puncturing. For a fault cleared in more than 500 msec. fragmentation of enclosure/uncontrolled ejection of solid material shall not take place.

18.9.4 All operations related to breaker, bus dis-connectors and earth switches shall be possible in door closed condition.

18.10 Finish of Interior Surfaces and Cleaning

18.10.1 The finish of interior surfaces of the metalclad enclosures shall facilitate cleaning and inspection. Any paints or other coatings that may be used shall be such that they will not deteriorate when exposed to the SF6 gas and other vapours, arc products, etc, that may be present in the enclosures. They shall also not contain any substances which could

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contaminate the enclosed SF6 gas or affect its insulating properties over a period of time. Measures taken to eliminate conducting particles shall be brought out clearly in the bid.

18.10.2 The equipment shall be manufactured and assembled at the MANUFACTURER's works under conditions of the utmost cleanliness.

18.10.3 The BIDDER shall indicate in the bid the finish which will be used for interior of pressurised bus duct enclosure.

18.11 Protective Finish/Corrosion Protection

18.11.1 The switchgear shall be treated and protected to withstand at least five year of operation under site conditions without corrosion or attacks from fungus or rodents.

18.11.2 The protective finish shall prevent deterioration due to corrosion, humidity, temperature, ageing and weather etc. under site conditions.

18.11.3 All exterior surfaces shall be cleaned and painted before leaving the factory with powder coated painting. The underside of all surfaces bearing upon the concrete foundation shall be given two coats of approved primer. Extra paint for retouching shall be supplied by the manufacturer. The paint shade shall be as aircraft gray shade 693 of IS -5 and subject to PURCHASER's approval. Before painting all the surfaces shall be prepared and cleaned by seven tank process or equivalent process. Powder coated painting shall be employed.

18.11.4 Supporting frame work shall be hot dip galvanised.

18.11.5 Gas monitoring and service piping including all fittings and armatures shall be made of copper, brass or stainless steel.

18.11.6 Joints of different metals that could lead to electrolytic corrosion must be avoided.

18.11.7 Before the metal-clad enclosed sections are joined together and charged with the SF6 gas they must be thoroughly cleaned.

18.12 Indication and Verification of Switch Positions

18.12.1 Indicators mounted external to the equipment, shall be provided on all circuit-breakers, isolators and earth switches which shall clearly show whether the switches are open or closed. The indicators shall be mechanically coupled directly to the main contact operating drive rod or linkage and shall be mounted in a position where they are clearly visible. The positions shall be designated as 'open' and 'close' and the use of colours to designate breaker position is not acceptable. Breaker, bus isolators, earthing switch isolator indications shall be through Semaphore and mounted in form of a MIMIC.

18.12.2 BIDDER shall also indicate alternative facility which bidder can provide, to ensure checking at site by Purchaser’s operators, that the circuit is not energised.

18.13 Pressure Relief device

18.13.1 Pressure relief devices shall be provided in each gas section to protect the

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main gas enclosures from damage or distortion during the occurrence of abnormal pressure increase or shock waves generated by internal electrical fault arcs.

18.13.2 Pressure relief shall be achieved either by means of rupture diaphragms venting directly into the atmosphere. Suitable guards and deflectors shall be provided to prevent pieces of diaphragm from flying out or any dangerous SF6 arc product gases escaping, in a manner that could endanger personnel who may be present.

18.13.3 The enclosure and barrier insulators shall be designed to prevent rupturing in the event of a service failure. Each insulator shall withstand the pressure rise due to an internal arcing fault on one side and with vacuum on the other side.

18.13.4 Suitable Exhaust ducting shall be provided.

19.0 SF6 Gas

19.1 Density and Pressure

The nominal operating pressure of SF6 insulated gas in the metal-clad equipment shall be as low as is compatible with the requirements for electrical insulation and space limitations to reduce the effects of leaks and to ensure that there is no chance of the gas liquefying at the lowest ambient temperature. The initial gas pressure or density at the time of charging the equipment shall provide a sufficient margin above the minimum allowable pressure for the plant to be safely operated for a reasonably long period before recharging is necessary.

19.2 SF6 Gas Purity

19.2.1 The SF6 switchgear shall be designed for use with SF6 gas complying with the recommendations of IEC-60376 at the time of the first charging with gas. All SF6 gas supplied as part of the contract shall comply with the requirements of IEC. 60376.

19.2.2 Molecular sieve or activated alumina or other absorbent for removal of SF6 arc products and moisture absorbents shall be provided in each gas compartment. Frequency and procedure for replacement of these shall be indicated by bidder.

19.2.3 The SF6 gas shall have the following characteristics:

1) Physical properties: Colourless, odourless, non-toxic and non- flammable. 2) Density at 20oC and/Bar 6.08 g/l 3) Electric strength 2.5 times that of air. 4) Compatibility Up to temperature of about 180

o C, its

Compatibility with material used in Electrical construction shall be similar to

nitrogen. 5) Toxic impurities SF6 gas shall comply with requirements

of the tests as per Clause 2.2 of latest version of IEC- 60376.

6) Dew point Between - 40 and - 41oC

7) Impurities SF6 shall not have impurities more than

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the maximum allowable quantities given below:

Sr. No.

Impurity Group Maximum permitted

Concentration Mass by Mass i CF4 0.05% ii Oxygen + Nitrogen (Air) 0.05% iii Water 15 ppm iv Acidity expressed as HF 0.3 ppm v Hydrolysable fluorides

expressed as HF 1.0 ppm

vi Oil content 10 ppm 8) Preferred cylinder size 40 Ltr. 9) Type of cylinder Seamless type

19.3 Permanent Gas Treatment Devices

1. Means shall be provided inside each enclosure for treating the SF6 gas by the use of desiccants, driers, filters, etc. to remove impurities in the gas.

2. All gas compartments shall be fitted with static filter material containers that will absorb residual and entering moisture inside the high voltage enclosures. Filters inside the breaker compartment shall also be capable of absorbing gas decomposition products resulting from the switching arc.

19.4 SF6 Gas Monitoring Devices

1. All gas compartments must have their own independent gas supervision and alarm systems. Each gas supervision circuit shall be equipped with a temperature compensated pressure gauge, test connection point and maintenance connection point and the same shall be easily accessible.

The Bidder shall provide individual temperature compensated gas

pressure gauge(s)/density device(s) which continuously monitor and display the gas density in each of the individual gas compartments as follows: a) "Gas Refill" Level : This will be used to annunciate the need for

gas refilling. The VENDOR shall provide two sets of potential free contacts for remote indication/ annunciation.

b) "Breaker Block" Level: This is the minimum gas density at

which the manufacturer will guarantee the rated fault interrupting capability of the breaker (in case the breaker is SF6 filled). At this level the device contact shall trip the breaker and block the closing circuits.

c) Over pressure alarm level : This alarm level shall be provided

to indicate abnormal pressure rise in the gas compartment. d) Gas pressure normal indication shall be provided.

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2. The gas density and pressure sensitive devices, together with all relays supplied by the manufacturer for use in protection, shall be approved by the PURCHASER. It shall be possible to test all gas monitoring relays without de-energising the primary equipment and without reducing pressure in the main section. Disconnecting type plugs and sockets shall be used for test purposes; the pressure/density device shall be suitable for connecting to the male portion of the plug.

3. Two potential free electrical contacts shall be provided with each and

every alarm condition. These are to be grouped together and wired to the cable termination blocks in the LT compartment to give remote alarm indications/annunciations in equipment being supplied by the PURCHASER. The BIDDER will be advised of the grouping required after the contract has been placed.

4. BIDDER shall advise if the breakers are suitable for breaking the load

current even if SF6 gas pressure has reduced to atmospheric pressure.

19.5 Sectionalisation

19.5.1 The assembly shall consist of completely separate, pressurized sections. The switchgear gas enclosures must be sectionalised with gastight barriers between sections or compartments.

19.5.2 The sections shall be so designed as to minimise the extent of plant rendered inoperative when gas pressure is reduced, either by excessive leakage or for maintenance purposes, and to minimise the quantity of gas that has to be evacuated and then refilled before and after maintaining any item of equipment. It is preferable that bus bars and bus disconnectors shall not have common gas sections. Further, disconnectors, circuit breakers, voltage transformers, cable chambers shall be separated from adjacent compartments by gas tight barriers.

19.5.3 The arrangement of gas sections or compartments shall be such that it is possible to extend existing busbars without having to take out of service more than one busbar at any given time.

19.5.4 In the event of interconnection of gas sections by means of external piping, each enclosure shall be provided with means of isolation from other gas compartments as well as means of filling up the SF6 gas such that gas evacuation/filling in one gas compartment shall not require gas evacuation/filling of any other compartment.

19.5.5 The mass of gas in all the individual compartments at rated nominal density shall be indicated in the bid.

19.6 Support Insulators and Section Barriers

19.6.1 The insulators shall be made up of non-hygroscopic, non-flammable and non carbonizing material having a tracking index of 600 or more as per IEC-60112 and resistant to acids and alkalies. The support insulators and section barriers/insulators shall be manufactured from the highest quality material. They shall be free from all voids and the design shall be such as to reduce the electrical stresses in the insulators to a minimum. They shall

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be sufficiently strong to ensure that the conductor spacing and clearances are maintained when short circuit faults occur.

19.6.2 Tests shall be carried out during the manufacture of the switchgear to ensure that all insulators and barriers are free of partial discharge at a voltage which is at least 20% greater than the maximum service voltage.

19.6.3 The Gas section barriers including seals to the conductor and enclosure wall shall be gas-tight and shall be capable of withstanding the maximum differential pressure that could occur across the barrier i.e with a vacuum drawn on one side of the barrier and on the other side, at least twice the rated gas service pressure that can exist under normal operating and maintenance conditions or the maximum gas over pressure, at least equal to the operating pressure of the relief devices, that could be attained with a persistent internal arc fault.

19.7 Gas Seals

19.7.1 All gas seals shall be designed to ensure that leakage rates are kept to specified minimum under all normal pressure, temperature, electrical load and fault conditions.

19.8 Expansion Joints and Flexible Connections

19.8.1 Expansion joints or flexible connections, in the metal enclosures, to absorb the actual or relative thermal expansion and contraction of the SF6 equipment as well as structures, foundations and floors on which the equipment is mounted, resulting from variations in the temperature of the switchgear equipment shall be provided, if required.

19.8.2 The number and position of expansion joints or flexible connections are to be determined by the BIDDER to ensure that the complete installation will not be subjected to any expansion stresses which could lead to distortion or premature failure of any piece of the GIS equipment, support structure or foundations.

19.8.3 Electrical continuity of the connection for all enclosures across bolted joints/expansion/flexible connections shall be achieved.

19.9 Supply of SF6 Gas

19.9.1 The contract shall include the supply of all the SF6 gas necessary for filling and putting into commercial operation the complete switchgear installation being supplied including loss during installation. In addition, ten percent of the total SF6 gas required for the GIS shall be supplied as spare and shall be included in the contract.

19.10 SF6 Gas Maintenance Plant (if applicable)

19.10.1 The entire plant necessary for filling and evacuating the SF6 gas in the switchgear equipment shall be supplied with the contract to enable erection and maintenance work to be carried out. This shall include all the necessary gas receivers for temporarily storing the evacuated SF6 gas as well as any other gases which may be used in the process. The capacity of the temporary storage facilities shall at least be sufficient for storing the maximum quantity of gas that could be removed from the largest compartment of GIS and adequate compartments on either side +10%

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extra SF6 gas when carrying out maintenance or repair work on any pieces of the switchgear and associated equipment. The necessary compressor to remove SF6 gas from the compartments, vacuum pump to create a vacuum inside the compartment before SF6 gas filling operation, dust and moisture filter shall form a part of the plant.

19.10.2 Where any item of the filling and evacuating plant is of such a weight that it cannot easily be carried by maintenance personnel, Bidder shall indicate the capacity of overhead crane / hoist to be provided..

19.10.3 The design of the plant, valves, couplings, connections, etc. must be of such a standard that leakage of any SF6 gas during the filling and evacuating processes is kept to an absolute minimum. The arrangement of valves, couplings and pipe work shall also be such as to prevent accidental loss of gas to the atmosphere.

19.10.4 The plant shall have facilities for drying air and SF6 gas or any other gases with which the switchgear compartment may be temporarily filled during the process of filling with SF6 gas.

19.10.5 Each of the gas compartments shall be fitted with permanent valves through which the gas is pumped into or evacuated from the compartments.

19.10.6 Details of the gas filling and evacuating plant that will be supplied, as well as the description of the filling and evacuating procedures shall be given in the bid.

19.10.7 The Mobile auxiliary plant complete with necessary hoses and couplings etc. for purifying and drying SF6 gas in the switchgear gas compartments shall be provided with the contract.

19.10.8 The auxiliary gas purification and drying plant shall preferably be combined as a single unit with the gas filling and evacuating plant.

19.10.9 Details of the plant and its operation and whether any instruments for testing the purity of the SF6 gas are automatically provided with the plant shall be submitted along with the bid.

19.10.10 Bidder shall advise the Purchaser regarding requirements of special gas masks and protective clothing required during fault repair of GIS to protect personnel from SF6 decomposition products.

19.11 SF6 Gas Detecting Instruments

19.11.1 Bidder shall supply portable SF6 gas detector. The portable SF6 gas detector shall be light weight and provided with long flexible probe to enable detection of SF6 gas leakage from hard to reach areas.

19.11.2 The Bidder shall furnish details/catalogues regarding the features of the portable SF6 gas detector offered by him.

20.0 Earthing

20.1.1 The BIDDER shall provide a "Main Ground Bus" rated 40 kA for 1 sec to which all intentionally earthed parts of the assembly must be connected. Provision of earthing of armours / metallic sheath of power cables shall be made in cable compartments for all feeders.

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20.1.2 It shall be the responsibility of the Bidder to provide a sufficient number of earth points so that dangerous voltages are not induced in the enclosure by the fault currents circulating in the inner conductor.

20.1.3 Earthing pads shall be provided for at least two paths to earth from the "Main Earth Bus" or each metallic enclosure and auxiliary equipment designated for connection to the station earth grid. The Bidder shall provide data to assure that the connections from the "Main Earth Bus" to the station earth will not interfere with required enclosure current paths or any operational feature of the assembly. A copper earth bar, located near the control cable entrances of all main and auxiliary equipment, shall be provided for the purpose of terminating the shield of each control cable.

20.1.4 The BIDDER shall be responsible for supplying all earthing materials required for bonding all the equipment and steelwork included in this contract to the main station earth mat to be provided by the PURCHASER.

20.1.5 The design of the earth system and connection to the switchgear shall also be compatible with the circulating currents that are present in the switchgear metal-cladding. When advising the PURCHASER on the design of the earth mat mesh, the VENDOR shall provide full details of the circulating currents expected to flow in the earth mat system.

20.1.6 Every section of the SF6 switchgear equipment including all panels, cubicles, kiosks and boxes shall be solidly bonded to the earthing system.

20.1.7 Earth switches, voltage transformers and panels shall be bonded to the earthing system as specified in the relevant previous clauses.

20.1.8 All steelwork, access decking, handrails (if any) etc., shall also be effectively bonded to the earthing system.

20.1.9 The design of the earthing system shall be such as to ensure the safety and protection of all operating and maintenance personnel under all normal and fault conditions. Detailed earthing drawings shall be prepared for the complete installation which shall be provided under this contract and submitted to the PURCHASER for approval.

20.1.10 The enclosure of the equipment and support structure of GIS shall be earthed in such a way that the following conditions are obtained:

(a) The touch potential at any part of the enclosure is less than 65 V.

(b) The induced current during normal operation is prevented from entering the earthing grid.

20.1.11 Requirement of electronic earthing (if any) for numerical relays and multifunction panel meters shall be furnished by the bidder.

21.0 Future Extension

21.1.1 It is proposed to make provision for additional bays at a later date.

21.1.2 It shall be possible in future to extend the bus bars.

21.1.3 It is a firm requirement that no changes are made to the enclosure during future extension. Also, the downtime must be minimum when extension is carried out. During erection/testing of extension, outage of only one bus

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section and associated equipment will be available. Under no circumstances outage of both the bus sections (resulting in complete shutdown of the station) will be permissible. The BIDDER is required to bring out in detail his proposal for achieving future extension and indicate if shutdown of any part of the equipment/circuit will be required for erection, dielectric testing along with Gas Line Diagram etc. The bidder will give step by step procedure for extension of bays on either side of GIS, at later date.

22.0 Foundation Channels & Supporting frame work

22.1.1 All supporting steel structures for switchgear bays etc. shall be a part of Bidder's supply.

22.1.2 PURCHASER will provide suitable foundation channels for grouting into the PURCHASER'S foundation floor to support the switchgear assembly. Necessary supporting frame work, levelling screws, inspection platforms etc. shall be provided by the BIDDER to fasten the switchgear base frames to the foundation channels. BIDDER shall submit drawing showing all details of the foundation channels on the civil guide drawing.

22.1.3 GIS will be installed in areas prone to earthquakes, it shall be designed to withstand seismic forces equivalent to 0.3g acceleration. Necessary devices shall be provided with suitable anti earthquake clamping arrangement.

22.1.4 GIS shall be supplied with bolts, nuts, washers and accessories required for fixing the GIS to the foundation. 10% extra of these hardwares shall be supplied with the GIS Board.

23.0 Temperature Rise

23.1 Temperature rise of enclosure and conductor shall be such that the final temperature does not exceed the values specified in Data Sheet-A for specified site conditions including the effects of solar radiation. BIDDER shall provide test reports/ calculations to prove this.

24.0 Gas Leakage

24.1 The guaranteed maximum gas leakage shall be less than 1% per year for any individual gas compartment and for the whole equipment.

25.0 Losses

25.1 Bidder shall provide details of the losses at rated current.

26.0 Welding, Nuts and Bolts

26.1 All welding shall conform to the requirements of relevant IEC standards and shall be performed by a fully certified fabricator or suitable submerged arc welding machines. At least 10% of all welds must be subjected to non-destructive testing by X-rays or ultrasound, and all records there of must be made available on request.

26.2 When drawings are submitted for approval, VENDOR shall indicate following :

(a) Type of weld (b) Procedure employed

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(c) Inspection applied

26.3 Details of bolt sizes and threading shall be clearly shown on the appropriate drawings. Where self-locking type of nuts are used, they shall be of the re-usable type. Pressed type nuts are not acceptable.

27.0 Tests and Test Reports

27.1 The Type Test Certificates for similar equipment shall be submitted with the bid.

27.2 Acceptance and routine tests for all supply equipments/components parts shall be carried out as per the relevant standards for the respective equipment in the presence of Consultant / Purchasers representitve. These test reports and shall be submitted to the PURCHASER before despatch of the equipment.

27.3 LT compartment panel shall be subjected to the following tests: i. High Voltage test (2000V for 1 minute) ii Megger test. iii Electrical control, interlock and sequential operation tests

28.0 Spares

28.1 Refer Clause no. 13 of Specific requirements of 33kV Gas Insulated Switchgear

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PART-B : INSTALLATION, TESTING AND COMMISSIONING OF 33 kV GIS

ALONG WITH ITS ACCESSORIES

1.0 SCOPE OF WORK

1.1 Installation, testing and commissioning of 33 kV GIS with all accessories.

2.0 CODES & STANDARDS

2.1 The electrical installation work shall comply with the latest applicable IEC standards, regulations, electricity rules & safety codes of the locality where the installation is carried out. Nothing in this specification shall be construed to relieve the BIDDER of this responsibility.

2.2 The BIDDER shall be responsible to comply with the codes and standards stipulated by local authorities.

3.0 GENERAL REQUIREMENTS

3.1 Bidder is strongly advised to inspect the site and examine and obtain all information required and satisfy himself regarding all matters and things such as access to site, areas likely to be allotted to him for his storage yard and for his site works, communication, transport etc.

3.2 Bidder shall note that no space will be provided by the PURCHASER for accommodating BIDDER’s workmen within the site premises. BIDDER shall make his own arrangements for food & lodging, outside Purchaser’s premises, in the nearby surroundings at his own cost.

3.3 The price quoted by the bidder shall be based on his own knowledge and judgment of the conditions and hazards involved and shall not be based on representations of PURCHASER/ OWNER.

3.4 Ignorance of site conditions shall not be accepted as basis for any claim for compensation. The submission of tender by the bidder will be construed as evidence that such an examination was made and any later claims / disputes in regard to price quoted shall not be entertained or considered.

3.5 Bidder shall indicate in his bid all the major assumptions, including major assumptions / criteria made by him on which the bid is based. The Bidder shall also furnish along with his bid a list of major sub Bidders (if any) he proposes to employ for the execution of this contract with sufficient back up details of their experience, previous jobs executed etc. Procedures for obtaining gate entry passes for Bidder’s & his subBidder’s employees shall be followed for working at Purchaser’s premises.

3.6 The Bidder shall take over the equipment to be erected from the Owner’s storage yard/ stores/ sheds/ railway siding, transport the equipment where required in actual position, erect, assemble all parts of the equipment and test and commission the same. As and when required Bidder shall have his own storage for equipment brought to site by him.

3.7 The Bidder shall furnish all tools, welding equipment, rigging materials, scaffolding, platforms, ladders, crane, fork lift, testing equipment, test connections and kits etc. required for complete installation, testing &

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commissioning of the items included in the contract work.

3.8 The Bidder shall be co-operative through the owner’s interest and ensure the safety of all personnel and works covered under this specification. In case of any conflict, Purchaser’s decision will be final. The Bidder & their sub-contractor shall follow Purchaser’s laid down Fire & Safety Regulations and Practices while executing the job at Purchaser’s site.

3.9 It will be the Purchasers responsibility to obtain approval/ clearance from local statutory authorities including Electrical Inspector, wherever applicable for conducting any work or for installation carried out which comes under the purview of such authorities. However, it is bidder’s responsibility to carry out the jobs arising out of Statutory Authorities’ observations & requirements.

3.10 The work shall be carried out strictly as per the instructions and layout drawings of the owner/ Engineer/ Manufacturer. In case of any doubt/ misunderstanding as to correct interpretation of the drawings or instructions, necessary clarifications shall be obtained from the Owner/ Engineer. The Bidder shall be held responsible for any damage to the equipment consequent to not following the manufacturer’s instructions correctly. All necessary drawings, Manufacturer’s equipment manuals etc. shall be returned by Bidder to the Owner after work completion at site.

3.11 The Bidder shall be responsible if any installation materials are lost or damaged during installation. All damages and thefts shall be made good by the Bidder till the installation is handed over to the Purchaser.

3.12 The Bidder shall have a separate cleaning gang to clean all equipment under erection and as well as the work area and the project site at regular intervals to the satisfaction of the Owner. In case the cleaning is not to the Owner’s satisfaction, he will have the right to carry out the cleaning operations and any expenditure incurred by the Owner in this regard will be to the Bidder’s account.

3.13 In order to avoid hazard to personnel moving around the equipment such as switchgear, etc which is kept charged after installation before commissioning, such equipment shall be suitably cordoned off to prevent any one accidentally going near it. All unused cut outs / openings of the foundation of GIS panel shall be covered by metal plates to avoid accidental fall of any person / tools in those cut outs / openings. (The metal plates shall be supplied by the Purchaser).

3.14 The Bidder shall carry out touch up painting on GIS, if the finish paint on panels is soiled or marred during installation handling. The paint shall be supplied by the Bidder.

3.15 The Bidder shall ensure workmanship of good quality and shall assign qualified supervisors/ engineers and competent labour who are skilled, careful and experienced in their several traders in similar works. The Owner/ Engineer shall reserve the right to reject non competent persons employed by the Bidder, if the workmanship is not of good order. The electricians / wiremen engaged by the Bidder for carrying out the job at Owner’s site shall have valid wireman license and job experience of preferably 3 years.

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3.16 It shall be the responsibility of the Bidder to obtain necessary Licence/ Authorisation/ Permit for work from the Licensing Boards of the locality/ state where the work is to be carried out. The persons deputed by the Bidder’s firm should also hold valid permits issued or recognized by the Licensing Board of the locality/ State where the work is to be carried out.

3.17 Foundation work for the equipment will be carried out by Civil contactor. However, minor civil works wherever found necessary for proper installation shall be carried out by the Bidder under this specification.

3.18 Equipment shall be installed in a neat workman like manner with proper care during handling to avoid any distortion or damages to delicate instruments.

3.19 All necessary tools required for installation of equipment shall be arranged by the Bidder.

3.20 Daily briefing of safety precautions shall be done by the working group at site before start of day’s work.

4.0 Inspection upon arrival at site

4.1 Immediately after GIS packages are received at site, it should be thoroughly examined externally for possible damages, which may have occurred during transit.

4.2 The various packages must also be checked. Internal inspection should be carried out to the extent possible through inspection covers. Particular attention should be paid to the connections, bolts, links, coil clamping bolts, current transformers and the general insulation.

5.0 Handling

5.1 GIS main package should be lifted only through lifting points provided for attaching the slings. Cover must always be jacked up using the jacking pads specially provided for that purpose. Jacks should never be placed under any valves.

6.0 Installation Precautions to be taken before erection

6.1 Never stand directly on any part of the GIS.

6.2 All the tools and spanners used for erection should be securely tied with rope so that, these could be recovered if dropped in, by accident.

6.3 All components should be carefully cleaned outside separately before erection.

6.4 Fibrous material should not be used for cleaning.

6.5 Flames should never be used near GIS. Smoking is banned at Purchaser’s site as it is a petroleum oil refinery.

7.0 Gas Filling

7.1 Before filling with gas, GIS should be fitted with all accessories such as valves, plugs and made air tight.

7.2 The gas which is to be filled in the GIS must be tested for dielectric strength and water content and should be in line with the recommendations.

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7.3 The vacuum pulling in the tank will avoid chances of air getting trapped and forming pockets. Necessary vacuum pump shall be arranged by the Bidder.

8.0 Terminal points of the supply for GIS equipment:

8.1 The flanges complete with gaskets, nuts, bolts and washers.

8.2 Cable end boxes and terminal boxes for all power and control cables including MV power cables.

8.3 Earthing terminals with lugs.

8.4 Any connection exposed to atmosphere shall be supplied with blanking plates, caps or plugs.

8.5 The terminal points of all accessories wiring shall include marshalling of all terminals of local instruments, protection devices, devices for remote indications up to the terminal block of LT compartment along with necessary cable lugs, glands.

PART 2 of 65

SPECIFICATION NO. TCE.6079B-B-Z-201


33kV GAS INSULATED SWITCHGEAR DATA SHEET - A

SHEET 32 OF 48

SL. NO. ITEM UNIT

REV. NO. 0 JOB NO.

TCE.

6079B

CLIENT: BHARAT PETROLEUM CORPORATION LIMITED

PPD. BY MBB

CHD. BY AVD PROJECT: AUGMENTATION OF GRID POWER

DATE 21.07.11

ISSUE R1

TCE FORM NO. 330 R3

1.0 GENERAL

1.1 Installation Indoor

1.2 Insulation SF6 Gas conforming to IEC 60376, 60376A and 60480.

1.3 Phases 3 - phase

1.4 Frequency 50 Hz

1.5 Voltage

1.5.1 Nominal operating voltage 33 kV 33 kV

1.5.2 Highest system voltage 36 kV

1.6 Rated current

1.6.1 Bus Bars 3150 A

1.6.2 Incoming transformer breaker 1600 A

1.6.3 Bus coupler breaker 2500 A

1.6.4 Bus tie breaker 2500 A

1.6.5 Outgoing feeders 1600 A

1.6.6 Short Time Current Rating 40kA for 3 sec

1.6.7 Internal Arc withstand capacity 40kA for 1 sec

1.6.8 Rated peak short circuit current 100 kA (peak)

1.7 Temperature

1.7.1 Reference ambient temp. 45oC

1.7.2 Max. Permissible temp. rise

As per IEC-60694

1.8 Withstand Test Voltage

1.8.1 1.2/50 micro-sec impulse (+ve & -ve) Breaker and Isolators : (each pole to earth and between poles)

170 kV (peak)

1.8.2 1 min. power frequency dry & wet 70 kV (rms)

1.9 System Earthing

1.9.1 Type Effectively earthed

1.9.2 Coeff. of earthing 0.8

1.9.3 Earthing material Copper Conductor of suitable size

2.0 33 kV CIRCUIT BREAKERS

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TCE FORM NO. 330 R3

2.1 Application Control, operation and protection of outgoing feeders, bus coupler and transformers

2.2 Type SF6 insulated, Vacuum interrupter and metal enclosed

2.3 Nos. of poles 3

2.4 Short circuit breaking current

2.4.1 RMS AC component 40 kA

2.4.2 % DC component As per IEC 60056

2.5 Making capacity 100 kA (peak)

2.6 Operating duty 0-t-CO-t'-CO t : 0.3 seconds t' : 3.0 minutes

2.7 Terminal Faults

2.7.1 First pole to clear factor 1.3

2.8 Additional breaking current ratings

2.8.1 Out-of-phase breaking 25% of rated breaking current at 200/ √ 3 % of rated voltage

2.8.2 Cable charging breaking current at 36 kV

Charging current of 3 kM long, 3x1Cx630sq..mm. copper, XLPE insulated, 33kV (E) grade cables

2.8.3 Small inductive breaking current As per IEC

2.9 Operating Mechanism Trip free

2.10 No. of trip coils 2 (Two)

3.0 33 kV ISOLATORS (SWITCH) AND

EARTH SWITCHES

3.1 Rated continuous current at 45 Deg.C As per SLD

3.2 Short time withstand 40kA for 3 sec

3.3 Impulse withstand voltage across isolating distance

195kV(Peak)

3.4 One minute power frequency withstand Across isolating distance

100 kV (RMS)

3.5 Operating mechanism Motor driven as well as Manual

3.6 Operating mechanism of feeder earth switch

Motor driven

4.0 33 kV Voltage Transformers

4.1 Type Cast Resin

4.2 Primary Voltage 22 /√3 kV

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TCE FORM NO. 330 R3

4.3 Secondary winding withstand voltage 2 kV(rms)

4.4 Method of connection Star

4.5 Power factor of secondary winding 0.8

4.6 Ratings of VTs

4.6.1 Metering 22 kV/√3 / 110 V/√3, Cl.1, 100 VA

4.6.2 Protection 22kV/√3 / 110 V/√3 , Cl.3P, 100 VA

5.0 33 kV Current Transformers

5.1 Type Cast Resin

5.2 Ratings of CTs As per SLD.

6.0 Surge Arresters

6.1 Nominal Voltage 34.5 kV

6.2 Max. Voltage 36.2 kV

6.3 Rated Voltage 27.0 kV

6.4 MCOV (Max. continuous operating voltage)

22 kV

6.5 Current & energy capability 10 kA – 9.8 kJ / kV of MCOV

7.0 33 kV GIS Bus Bar

7.1 Type Isolated / 3-Phase type, SF6 gas insulated

7.2 Type of cooling Natural air cooled

7.3 Nominal service voltage 33 kV

7.4 Maximum system Voltage 36 kV

7.5 Continuous current rating 2500 A

7.6 Bus bar material Electrolytic grade Copper

7.7 Maximum allowable temperature of bus bars at rated current

oC 85oC

7.8 Maximum allowable temperature of bus bars when rated short circuit current is carried for three seconds when fault occurs at maximum operating temp.

oC 250oC

7.9 Maximum temperature of enclosure at rated current and ambient temperature of 45oC

oC 70oC

7.10 Bus enclosure material Aluminium / Mild Steel

7.11 Degree of protection for enclosure Water and gas tight

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TCE FORM NO. 330 R3

7.12 Material of insulators 36 kV Non-hygroscopic cast-resin/Porcelain

7.13 Cable entry Bottom

7.14 Gland Plate Non magnetic material

8.0 APPLICABLE STANDARDS IEC

8.1 GENERAL

8.1.1 Rotating Electrical Machine IEC-60034

8.1.2 High voltage switchgear and controlgear –Part-1

IEC-62271-1

8.1.3 High voltage Alternating Current Circuit Breakers

IEC-62271-100

8.1.4 High voltage test techniques IEC-60060

8.1.5 Graphic symbols IEC-60117

8.1.6 Alternating Current Disconnectors and Earthing Switches

IEC-62271-102

8.1.7 Current transformers IEC-60044-1

8.1.8 Voltage transformers IEC-60044-2

8.1.9 Electrical relays IEC-60255

8.1.10 Low voltage fuses IEC-60269

8.1.11 Motor starters IEC-60292

8.1.12 Specification and acceptance of new sulphur hexafluride

IEC-60376

8.1.13 Use and handling of SF6 IEC-60271-303

8.1.14 Guide for checking SF-6 Gas taken from electrical equipment

IEC-60480

8.1.15 AC metal enclosed switchgear & control for rated voltage above 1kV and upto & including 52 kV.

IEC-60298/ IEC-60694/ IEC-62271-200

8.1.16 Alternating current disconnectors Bus-transfer current switching by disconnectors

IEC-61128

8.1.17 Alternating current earthing switches Induced current switching

IEC-61129

8.1.18 Specification for trans- portable gas containers Seamless Steel Containers

BS-5045 - Part I

8.1.19 Voltage Detection Systems IEC 61243-5

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ISSUE R1

TCE FORM NO. 330 R3

8.1.20 Surge limiter Surge arresters IEC 60099

8.1.21 Degrees of protection by enclosures(IP Code)

IEC60529

8.1.22 Insulation co-ordination IEC-60071

8.1.23 Power Installation exceeding 1kV IEC-61936-1

8.2 APPLICABLE STANDARDS FOR

EQUIPMENT PROTECTION

8.2.1 Emissions Standards

8.2.1.1 ISM RF Equipment - Electromagnetic Disturbance Characteristics

EN55011 (CISPR 11)

8.2.1.2 Electromagnetic emission tests for measuring relays and protection equipment

60255-25

8.2.1.3 EMC-Limits for harmonic current Emissions.

61000-3-2

8.2.1.4 EMC Limits-Limitations in voltage changes, voltage fluctuations and flicker in public low-voltage supply systems.

61000-3-3

8.2.2 Immunity Standards

8.2.2.1 Electrostatic discharge (ESD) immunity test

61000-4-2 60255-22-2 IEEE C37.90.3

8.2.2.2 Radiated, radio-frequency electromagnetic field immunity test

61000-4-3 60255-22-3 IEEE C37.90.2 (10V/m)

8.2.2.3 Electrical fast transient/burst immunity test

61000-4-4 / 60255-22-4 IEEE C37.90.1

8.2.2.4 Surge immunity test 61000-4-5

8.2.2.5 Immunity to conducted disturbances, induced by radio-frequency fields

61000-4-6

8.2.2.6 Electrical fast transient/burst immunity test

60255-22-6

8.2.2.7 Immunity to power frequency magnetic fields

61000-4-8

8.2.2.8 Oscillatory waves immunity test 61000-4-12

8.2.2.9 (Damped Oscillatory and Ringwave)

1995-05 60255-22-1 IEEE C37.90.1

8.2.3 Safety

8.2.3.1 Harmonized Safety Standard 61010-1

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ISSUE R1

TCE FORM NO. 330 R3

8.2.3.2 Insulation coordination for measuring relays and protection equipment- Requirements and tests

60255-5

8.2.4 Power Supply Standards

8.2.4.1 AC Power supply interruptions 61000-4-11

8.2.4.2 Immunity to conducted, common mode disturbances.

61000-4-16

8.2.4.3 Ripple on D.C. power supply 61000-4-17

8.2.4.4 Voltage dips, short interruptions & voltage variations on D.C. input power port immunity test

61000-4-29 60255-11

8.2.5 Environmental Standards

8.2.5.1 Environmental Testing Cold 60068-2-1

8.2.5.2 Environmental Testing Dry Heat 600068-2-2

8.2.5.3 Environmental Testing Vibration Vibration tests (sinusoidal)

60068-2-6 / 60255-21-1

8.2.5.4 Environmental Testing Shock 60068-2-27

8.2.5.5 Environmental Testing Bump 60068-2-29

8.2.5.6 Environmental Damp Heat cyclic(12+12 hour cycle)

60068-2-30

8.2.5.7 Environmental Testing Drop and Topple 60068-2-31

8.2.5.8 Shock and bump tests 60255-21-2

8.2.5.9 G3 type conformal coating on electronics cards and PCBs for CLASS-3 environment

654-4-1987

8.2.6 Communication Standards

8.2.6.1 Substation Comm. Standard access method and physical layer specifications

61850-3 IEEE 802.3 CSMA/CD

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33kV GAS INSULATED SWITCHGEAR

DATA SHEET B SHEET 38 OF 48

ENQUIRY/SPECIFICATION NO.: BIDDER:

SL. NO.

ITEM UNIT

NOTES TO BIDDER SIGNATURE OF BIDDER & DATE

1. ITEMS WHICH DEVIATE FROM THE SPECIFICATION SHOULD BE MARKED WITHIN ASTERISK (*) AND DETAILS TO BE GIVEN IN SCHEDULE OF DEVIATIONS.

2. THIS DATA SHEET SHALL BE FILLED UP COMPLETELY AND A COPY SHALL BE ENCLOSED WITH EACH COPY OF THE BID.

ISSUE R1

TCE FORM NO. 294 R3

1.0 General

1.1 Manufacturer’s name

1.2 Country of Origin -

1.3 Applicable standard (s)

2.0 0 Nominal system voltage kV

2.1 Maximum continuous voltage kV

2.2 Power frequency withstand (one minute) voltage

kV

2.2.1 short circuit withstand kV (rms)

2.2.2 Impulse 1.2/50 sec

withstand voltage

kV (peak)

3.0 Constructional features

3.1 Degree of protection

3.1.1 For Gas insulated compartment

3.1.2 LT Compartment

3.2 Paint shade

3.3 Painting specification TO BE FURNISHED BY BIDDER

3.4 Cable Entry

3.5 Busbars

3.5.1 Construction (Isolated / three phase)

3.5.2 Material

3.5.3 Size

3.5.4 Temperature rise over ambient of 45 Deg.C

Deg.C

3.5.5 Losses at rated current Watt

3.5.6 Dimensions

3.5.6.1 Incomer

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3.5.6.2 Buscoupler

3.5.6.3 Bus-Tie feeder

3.5.6.4 Outgoing feeder without PT

3.5.6.5 Outgoing feeder with PT

3.5.6.6 PT panel

3.5.6.7 Adaptor panel (if any)

3.5.6.8 Overall dimensions

3.5.7 Weight kg

3.5.7.1 Incomer

3.5.7.2 Buscoupler

3.5.7.3 Bus-Tie feeder

3.5.7.4 Outgoing feeder without PT

3.5.7.5 Outgoing feeder with PT

3.5.7.6 PT panel

3.5.7.7 Overall weight

3.6 Minimum clearance required mm

3.6.1 Front

3.6.2 Rear

3.6.3 Side

3.6.4 Top

4.0 Total Mass of Gas filled kg

5.0 Pressure of SF6 inside cubicle bar

6.0 Leakage of SF6 %/year

7.0 Life of all type of Gaskets year

8.0 Circuit Breaker

8.1 Type of Circuit breaker

8.2 Short circuit breaking current kA (rms)

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8.3 Short circuit Making current kA (peak)

8.4 Peak withstand current kA (peak)

8.5 Rated duration of Short circuit Sec

8.6 Total break time cycles

8.7 Make time cycles 4 Cycles (Max.)

8.8 Cumulative switching capacity without requiring maintenance

Nos.

8.9 Pressure inside the interrupter mm.Hg.

8.10 Contact wear indication provided Yes/No

8.11 Mechanical facility for checking loss of vacuum provided

Yes/No

8.12 Vacuum monitoring relay provided Yes/No

8.13 Adequate shielding against x-ray radiations provided

Yes/No

8.14 No. of Auxiliary contacts

8.15 Operating Duty

9.0 Circuit breaker operating mechanism

9.1 Type of closing mechanism

9.2 Spring charging mechanism

9.3 Spring charging motor :

i) Rated voltage Volts

ii) Rating Watts

iii) Speed rpm

iv) Class of insulation

v) Satisfactory operation of spring charging motor between 80% - 100% of rated voltage

Yes/No

vi) Time required to charge the spring from fully discharged

sec.

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condition

vii) Overload and short circuit protection particulars

9.4 Adequate spring reserve for one o-c-o operation without intentional time delay

–

9.5 Mechanical indication for spring charged condition provided

–

10.0 Two position Disconnector switch

10.1 Make

10.2 Rating A

10.3 Short circuit withstand capacity kA / sec

10.4 Aux. contacts

10.5 Operating mechanism

11.0 Three position Disconnector switch

11.1 Make

11.2 Rating A

11.3 Short circuit withstand capacity kA / sec

11.4 Aux. contacts for disconnector

11.5 Aux. contacts for Earth Switch

11.6 Operating Mechanism

11.7 Operating Mechanism for Earth switch if the same is distinct

12.0 Instrument transformers –

12.1 Current transformers - metering and protection

12.2 - Make –

13.0 Type –

13.1 Applicable standard –

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13.2 Class of insulation –

A) Ratio –

B) Rated VA Burden VA

C) Accuracy class CL, PS

D) Minimum knee-point voltage Volts

E) Maximum magnetisation current at proposed setting

mA

F) CT secondary resistance Ohms

G) Magnetisation characteristic curve attached

YES / NO

H) Dimensioned drawing attached YES / NO

I) Applicable standard

14.0 Voltage transformers –

14.1 Make –

14.2 Type –


14.4 Type of insulation –

15.0 Indicating meters –

15.1 Make –


15.3 Type of movement –

15.4 Size – x mm

15.5 Scale size (in degrees) –

15.6 Mounting, flush type other –

15.7 Accuracy –

15.8 VA burden for each type –

16.0 Multifunction meter –

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16.1 Make –

16.2 Type –

16.3 Standard to which it conforms –

16.4 Maximum number of digits –

16.5 Voltage coil rating Volts

16.6 Current rating Amps.

16.7 VA burden VA

16.8 Accuracy –

16.9 Draw out / non – drawout type –

16.10 Mounting, flush type other –

16.11 Test plug/test blocks testing terminals with links

– Electromechanical

Solid state p base

17.0 Protection relays – Make type

17.1 Protective Relay having non directional Inverse time over-current and earth fault, Instantaneous over-current and earth fault protection element

–

17.2 Protective Relay having directional and non directional Inverse time over-current and earth fault, Instantaneous over-current and earth fault protection element

–

17.3 Lock out relay –

17.4 Bus differential protection Relay

17.5 Check zone differential protection Relay

17.6 CT supervision relay

17.7 Cable Differential Relay for all feeders except CCR and DHT feeders

17.8 Cable Differential Relay for CCR and DHT feeders

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TCE FORM NO. 294 R3

17.9 Trip supervision relay

17.10 Auxiliary relays for DC fail, contact multiplication

18.0 Termination / wiring

18.1 Size and Type of wires for control wiring -

18.2 Colour coding for wires for : –

A) D.C. Control circuits –

B) A.C. Auxiliary power circuit like panel space heater, panel illumination etc.

–

C) A.C. Metering circuit –

D) Earthing –

18.3 Numbered ferrules at both ends Yes /No

18.4 Insulated sleeves provided at wire terminations

Yes /No

18.5 Terminals :

A) Make –

B) Current rating Amps

C) Clamp type / bolt type –

D) Moulded inter-terminal barriers provided

Yes /No

E) Maximum conductor size and number of conductors which it can receive

Sq.mm

F) Disconnecting type for CT circuits Yes /No

G) Terminal marking facility provided Yes /No

H) Crimp type connectors provided at the terminals

Yes /No

I) 20% spare terminal provided Yes /No

19.0 Cable termination –

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TCE FORM NO. 294 R3

19.1 Rated voltage kV


19.3 Make of Cable plug

19.4 Type of Cable plug –

PART 2 of 65

TCE FORM NO. 329R5


TATA CONSULTING ENGINEERS LIMITED SECTION:D2


DATA SHEET-C SHEET 46 OF 48

ISSUE R1

INFORMATION / DRAWINGS TO BE FURNISHED BY THE VENDOR AFTER

AWARD OF CONTRACT

1.0 CONSTRUCTION DETAIL DRAWINGS

1.1 General outline drawing showing front and side elevation and plan of the equipment with detailed dimensions.

1.2 Providing details of load foundation / Cutout requirement etc for carrying out the required civil works.

1.3 Drawings giving the weights for foundations.

1.4 Mounting Details of Framework

1.5 Providing details of Earthing requirements (if any specific)

1.6 Cable box connections.

1.7 Schematic control alongwith logic block diagram and wiring diagram for all auxiliary equipment.

1.8 Heat load in watt

2.0 CIRCUIT BREAKERS

2.1 Length of contact travel, mm.

2.2 Total length of break/pole, mm

2.3 Rate of contact travel :

a) At tripping, metres/sec.

b) At closing, metres/sec.

2.4 Recovery voltage distribution between breaks in percent of rated voltage.

a) Single line to ground fault.

b) Interruption on short lines.

c) Switching off an unloaded transformer.

2.5 Power at normal voltage for tripping coils Watts

2.6 Arc duration at 100% interrupting capacity:

a) Opening :

Arcing time - No. of loops and

time including resistor current duration

b) Resistor current duration Cycle

c) Total length of the arc mm

d) Maximum length of the arc mm

2.7 Voltage withstand v/s. time graph in the range of 0.5 to 1000micro sec.:

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TCE FORM NO. 329R5





ISSUE R1

3.0 ISOLATORS & EARTHING SWITCHES

3.1 Assembly drawing showing plan and elevation of isolator and earthing switch incorporating mounting dimensions, overall dimensions, weight.

3.2 Bill of materials

3.3 Control wiring diagram.

3.4 Location and mounting details of manual operating handle, operating devices and viewing ports.

3.5 Details of interlock arrangement.

4.0 VOLTAGE TRANSFORMER PARTICULARS

4.1 Total weight of each VT

4.2 General Arrangement drawing

4.3 Maximum shipping weight

4.4 Rating and diagram plate drawing

5.0 CURRENT TRANSFORMER PARTICULARS

5.1 Total weight of each CT

5.2 General Arrangement Drawing

5.3 Maximum shipping weight

5.4 Rating and diagram plate drawing

5.5 CT characteristic curves with excitation current vs. sec. voltage for each core as measured in the case of protection CTs

5.6 CT secondary resistance as measured in Ohms.

6.0 LT COMPARTMENT AND OPERATING MECHANISM

6.1 Schematic diagram indicating terminal numbers for external connections and with a bill of material for all the equipment.

6.2 Control cabinet drawing showing outline dimensions, cable entry openings, fixing arrangements, location of terminal blocks, mimic gas section diagram, annunciation windows, padlocking arrangement, weights etc.

6.3 MANUFACTURER's technical literature on various equipments mounted on control cabinet.

6.4 Cabinet internal wiring diagram (This drawing shall be submitted only for information and records and shall be based on an approved schematic drawing. The correctness of this drawing shall be the responsibility of the VENDOR).

6.5 Test certificates for the control cabinet and the various equipment mounted therein.

6.6 Size, overall diameter and number of cables from GIS to control cubicles.

6.7 Interlock sequences and control schematics.

6.8 All the links in marshalling box shall of droppable link type.

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ISSUE R1

7.0 GIS AND SF6 BUS

7.1 General arrangement and dimensioned layout of the GIS bus installation showing front and side elevation and plan of the equipment with detailed dimensions.

7.2 Three dimensional drawing of the GIS including locations of various devices, viewing ports, manual operating handles etc.

7.3 Detailed assembly and erection drawings with detailed procedure for erection of the equipment at site.

7.4 Arrangement of the bus, insulators, etc., within the bus.

7.5 Drawings of embedded leveling and support steel.

7.6 Detailed gas section drawing of the GIS.

7.7 Detailed maintenance manual for maintenance of various components of the GIS.

7.8 Drawings of the equipment and/or sub-assemblies shall clearly identify every component of the equipment, referenced to a parts list, including component description and manufacturer's parts numbers. This will facilitate identification of parts when ordering or maintaining a spare parts inventory.

7.9 Detailed grounding drawing (with calculations) showing grounding mat of the installation (to be provided by the Purchaser) and connection of the equipment with the ground mat. Control of transient over voltages shall be considered in the design of ground grid connections and detailed calculations shall be submitted by the Vendor.

7.10 Detailed drawing of the cable termination chamber.

7.11 Detailed drawing of GIS compartments of a typical bay.

7.12 GIS component model parameters for insulation co-ordination/ fast transient over voltage studies to be carried out by the PURCHASER and verified by the VENDOR.

7.13 Exploded view of GIS compartment indicating all the important parts.

8.0 Other Information

8.1 Grounding Design Requirements

8.2 Special Requirement of Electronic Earthing for numerical relays and multifunction meter (if any)

8.3 Details for SF6 gas detector

PART 2 of 65

PART 2 of 65

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