DAKSHIN HARYANA BIJLI VITRAN NIGAM Office of the Chief General Manager/P&D, Vidyut Sadan, Vidyut Nagar, Hisar-125005 Tel: 01662-221285, 221830 (GM/P&D) Fax: 01662-220481 Technical Specification No.- S-168/DD-177 11 KV Switchgear Panel Vacuum Type Issue of Month: Feb. 2008 Chief General Manager/P&D DHBVN, Hisar
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TECHNICAL SPECIFICATION FOR 11 KV SWITCHGEAR PANELS VACUUM TYPE WITH 11KV CAPACITOR CONTROL PANELS 1. SCOPE: This specification covers the design, manufacture, assembly, testing at manufacturer s works before dispatch, supply and delivery FOR destination of 350MVA, 11KV Vacuum type switchgear panels with 11KV capacitors control panel. 2. STANDARDS: The Switchgear panels shall comply in all respects the requirement laid down in the latest editions of IS-3427, IS-3231, IS: 2705, IS: 3156 & IS-13118-199. 3. CLIMATIC CONDITIONS: conditions: The equipment is required to operate satisfactorily under the following site 3.1 Max. Ambient Temperature 60 ºC 3.2 Min. Ambient Temperature -5 ºC 3.3 Max. Relative humidity 100% 3.4 Min. Relative humidity 26% 3.5 Average no. of rainy days per annum Nearly 120 days 3.6 Average annual rainfall 900 mm 3.7 Average number of dust storm days per annum 35 3.8 Isoceraunic level 45 3.9 Max. Wind pressure 195Kg / sq. meter 3.10 Altitude above mean sea level Less than 1000 meter 4. TYPE AND RATINGS: The 11KV Switchgear panels shall comprise of 11KV Vacuum Type circuit breakers, control relay panel, instrument panel and instrument transformers (complete in all respect) etc., suitable for indoor use. The equipment shall be totally enclosed in metal clad cubical, dust and vermin proof with necessary isolation arrangement. Each panel shall be easily extensible on either side and should be complete with necessary internal copper connections, small wiring, L.T. fuses and supporting framework with bolts to secure it to the floor. Each panel shall be provided with space heater, door switch with lamps and 15 - Ampere power receptacle. The breakers shall have the following ratings: 4.1 Type Vacuum type 4.2 No. of poles 3 4.3 Nominal System Voltage 11 KV 4.4 Highest System Voltage 12 KV 4.5 Rated frequency 50+1.5Hz 4.6 Rated continuous current rating at Ambient 800 Amp for incoming; 400 Amp for temperature, as specified in IS: 13118-1991 outgoing feeders 4.7 Symmetrical breaking capacity 350 MVA 4.8 Impulse withstand test voltage 75 KV (peak) 4.9 One minute power frequency withstand test 28 KV (rms) voltage 4.10 Short time current rating Not less than 18.4 KA for 1 Second. 4.11 System neutral Solidly earthed 3
5. GENERAL DESIGN OF SWITCHGEAR PANELS: 5.1 OPERATING MECHANISM: The vacuum type circuit breaker shall be trip free and the breaker control shall be draw out type. The VCBs shall be suitable for operation from 24 DC auxiliary supply. The operating mechanism shall be motor operated spring charged type. There shall be provision (s) for manual charging of closing spring and emergency hand trip. The motor used for the purpose will be suitable for 240 V AC. All auxiliaries shall be supplied from AC and arrangement shall be made for automatic switch over to DC in case of AC supply failure. The operating mechanism shall works satisfactorily between 85-110% of rated supply voltage. 5.2 INSTRUMENT PANELS: Each unit shall have its own instrument panel provided at the top & complete with small wiring connections from relays, instrument transformers, metering instruments, indicating instruments, selector switches & circuit breaker control switch. All wiring shall be carried out by using stranded single annealed copper conductor, insulated with poly vinyl chloride insulation suitable for 650 V service and in accordance with IS: 732-1963. CT/PT circuits shall use wire of not less than 2.5 mm² cross - sectional area whereas control/alarm/supervision circuit shall use wire of not than 1.5 mm² cross - sectional area. All wires will be continuous from one terminal to the other and also will have no T - Junction enroute. The connections shall be securely made with the help of suitable connecting lugs duly crimped on the copper conductor. The meters and relays shall be mounted in a convenient position so as these are readily accessible for inspection or repair. The terminal board provided in the instrument panel of VCBs will be made of molded dielectric having brass studs, washers, holding nuts & locking nuts. All holding nuts shall be secured by locking nuts. The connection studs shall project 6 mm from the lock nut surface. No OTHTER TYPE OF TERMINAL BORAD IS ACCEPTABLE. The panels shall have a degree of protection of IP - 4X. The leads from the metering CTs shall be directly terminated at TTB and there from at the KWH meter with a provision to seal TTB and KWH meter. The said CT leads will be effectively concealed to prevent their tempering enroute as well as at TTB. Similarly PT leads from secondary box of the PT to TTB & there from to energy meter, including inter panel PT leads, will also be effectively concealed to prevent their tempering. The mode and extent of concealing the metering leads of CTs & PTs, to prevent their tempering (by unscrupulous operating personnel), will be discussed and mutually agreed upon with the successful bibber (s). TTB, used on the instrument panel, should be suitable for front connections. Earthing of current free metallic parts or metallic bodies of the relays switches mounted on the instrument panel and metal enclosed switchgear shall be done by a suitable sized copper conductor. Earth bus made of 25 X 3 mm bare copper flat will be extended through entire length of 11KV switch-board with suitable provision to connect it to the sub-station earth at the extremities. The earthing arrangement will meet with the requirements laid down in IS: 3427, read with its latest amendments. 5.3 INSTRUMENT TRANSFORMER: The secondary voltage & current rating of the instrument transformers shall match with the metering and protective equipment. The CTs shall have ratio & accuracy class as mentioned in the schedule of requirement. The CTs shall be wound/ring type in accordance with their ratings. The terminal boards, associated with REF CTs & Over Current / Earth Fault Protection CTS will be of disconnecting type, having short circuiting facility & thus facilitate secondary testing of concerned protective relay without disturbing the associated small wiring. Interchangeability of housing of CTS, from one panel to another, must be ensured. A resin cast potential transformer of ratio (11000 3)/(110 3) volts, having 100 VA output per phase with 4
accuracy class 0.5 as per ISS: 3156 (Part-II) 1965, shall be provided on the incoming side of each panel set and shall be star / star connected. It shall be provided with HT and LT fuses. The neutral point, of star connected secondary windings of instrument transformers, shall be earthed to the main earth bus referred to in concluding paragraph of clause 5.12. Multiple earthing of any instrument transformers shall be avoided. 5.4 BUS BAR: All the panels shall be provided with insulated copper bus bar of 800 Amps current rating for all switch boards. These shall be connected in a separate moisture and vermin proof sheet metal chamber. The bus - bar connection & insulator supports shall be mechanically strong & rigidly supported so as to withstand the stresses, generated by vibrations, variation in temperature and severe short circuits. The bus - bar should be in horizental formations to enable DHBVN to connect with existing Circuit Breaker Panel Board without any difficulty in matching. The Adopter Panel, if required to match the loose panel with the existing panels, shall be prepared / fabricated as per site conditions by the Nigam at its own cost. The bus - bar shall be supported on insulator at short intervals, keeping adequate clearance between the bus bar and earth. The bus - bar chamber shall be provided with inspection cover with gaskets & bus bar shutters. Provision shall be made for future extension of bus bar & switch board. 5.5 LIMIT OF TERPERTURE RISE: The temperature rise, of current carrying parts, shall not exceed the permissible limits above the ambient temperature as per relevant standards (latest edition). 5.6 BUSHING INSULATORS: These shall comply with latest version of IS: 2099 in all respects. 5.7 DISCONNECTORS OF CIRCUIT BREAKER & THEIR INTERLOCKS: All disconnector s (isolators) of 11KV VCBs & interlocks between different pieces of apparatus, provided for reasons of safety & for convenience of operation of switchgear, shall meet with the requirement of IS: 3427-1969 read with its latest amendment. 5.8 CABLE BOXES: Each 11 KV incoming VCBs shall be provided with cable boxes, complete with jointing kits & sealing material for receiving 3 Core, 11 KV XLPE type outer PVC sheathed cable of size 630 mm² (Panel with CT ratio 400-200/5 5 5 A). The outgoing 11KV VCBs, including 11KV capacitor controlling VCB, shall be provided with cable boxes suitable to receive 3 Core, 11 KV XLPE type outer PVC sheathed cables of size up to 300 mm² (Panel with CT ratio 300-150/5-5A). The 11 KV station transformer VCB shall be provided with cable boxes ( Epoxy Resin Type ) suitable to receive 3 Core, 11KV XLPE type outer PVC sheathed cables of size up to 50 mm² (Panel with CT ratio 60-30/5-5A). Each cable box shall have vertical entry from below. These cable boxes shall be complete in all respects, including cable glands of requisite size. It is clarified that one jointing kit/cable box is required to connect one 11KV XLPE cable with one 11KV VCBs. No separate (extra) jointing kit is required. 5
5.9 RELAYS: All the relays, except the relays for DC failure alarm, supervision alarm, annunciation scheme, shall be draw out type and mounted on the front of each circuit breaker control panel in a flush pattern case. All relays shall be provided with testing facilities. In case the same can not be provided within the relay, a separate test block and test plugs shall be provided. The relay adjustment devices shall be easily accessible when the relays have been mounted on the panels. The relays shall conform to the latest edition of IS: 3231. The relays shall not operate at a current equal to or less than the setting. The minimum operating current shall not exceed 110% of the setting. The coils & CT circuit of the relay should be suitable to withstand the minimum operating current continuously, in case the minimum operating current is around 110%. The relays covers and cases shall be dust tight, moisture and vermin proof. Operation Indicators shall be provided on all relays and on their immediate auxiliaries for indication, regarding type of fault and phase involved. It shall be possible to reset the operation indicator, without opening the relays covers. All relays shall be tested at manufacturer s works and test certificates got approved, before dispatch of material. The bidder shall submit the descriptive and pictorial literature, in quadruplicate, in respect of each relay proposed, along with the tender. All relays in the specification shall be suitable for 24 V DC auxiliary voltages. 5.10 ALARM EQUIPMENTS: The incoming feeder panel shall be provided with one alarm bell and alarm indicating auxiliary relays. It shall indicate tripping of circuit breaker, under fault conditions, with the help of auto trip lamp and alarm. It shall be complete with the indicating lamp and push button switches for Accepts and Resets alarm. 5.11 SUPERVISION SCHEME: 11KV switches panels, covered by this specification, shall be provided with the following lamp indication: Circuit breaker Open Circuit breaker Close Auto trip Spring Charged Green Red White Blue For monitoring the trip circuit healthy conditions, both in open and close position of the circuit breaker, 1 No. trip circuit supervision relay is proposed. In case of trip circuit being faulty, the operation of this relay shall be accompanied by audio - visual annunciation. It shall be possible to silence the buzzer by pressing the accept push button but the lamp shall continue to glow till the fault has been attended. Circuit breaker Close & Open lamps shall be wired so as to be on 240 V AC under normal condition. 5.12 METERING SCHEME: The 11 KV Incoming VCB will be provided with a digital Voltmeter along with a selector switch. The selector switch shall facilitate the measurement of Phase - Phase and Phase - Neutral voltage, one by one. The static voltmeter shall be rated for 110 V (Phase Phase Voltages). The instrument shall be static type of industrial grade A classification with accuracy class 1.0 & shall confirm to IS: 1248 (1968). 6
Each of the 11 KV VCB Panel will be provided with a suitably sealed digital ammeter, rated for 5Amp (additional dials; if any, required to cover all the taps of the CTs, shall be included at the time of bidding) & a selector switch, facilitating measurement of phase currents. The instrument shall be of static type, industrial grade A classification, having accuracy class 1.0 & shall conform to IS: 1248 (1968) Each of the 11 KV VCB, except the 11 KV capacitor VCB, will be equipped with a three phase four wire static trivector meter (Confirming to Technical Specification no. S 45 / SE / P & D / XEN / DD II; Static CT / PT Operated Trivector Meter for 11 KV Feeders) & suitable for three phase four wire unbalanced load conditions with accuracy class 0.5 and having RS 232, RS 485 Port for Data Logging / Data -Downloading facility. The trivector meter shall be rated for 5 Amp CT secondary and 110/ 3 V (phase to neutral), available from 11 KV PT mounted on the incoming VCB. Each of the 11KV VCB will be provided with a static power factor meter. The static PF meter, having range of 0.5 lag one - 0.5 lead, shall be of static type; suitable for use on three phase three wire unbalanced system. It shall be rated for 5A CT secondary & 110 Volts (Phase Phase Voltage), having accuracy class 1.0 with digital display. NOTE: Routine test certificates of all the indicating & integrating instruments will be submitted along with the routine test certificates of 11 KV switchgear. 5.13 PADLOCK: Padlock or some other arrangement of approved design shall be provided for locking the equipment in OFF position. All locks shall have two keys, in addition to the master key which shall be provided for each panel set. Approved racks or cabinets, for accommodation of padlocks and keys while in use, shall be provided along with each panel set and it shall be suitably labeled and numbered for identification. 5.14 AUXILIARY SWITCHES: In addition to the auxiliary contacts required for normal operation, each circuit breaker shall be provided with 2 NO & 2NC spare auxiliary contacts duly wired up to terminal block. 5.15 MONITORING FROM REMOTE: Suitable arrangement should be provided to make it possible to monitor the following conditions of the 11 KV VCB at the remote end, through a communication system to be provided by the Nigam. Sr. No. CONDITIONS 1 D C is healthy 2 Breaker is off 3 Breaker is on 4 Breaker is mechanically free to close 5 Spring, for closing mechanism, is charged 6 Trip Circuit is healthy 7 Breaker is not anti pumping 8 Tripping of Breaker with the operation of Instantaneous High Set Element, installed on Phase & Earth Fault Units, indicating the Phase or Earth Fault involved 9 Tripping of Breaker with the operation of Inverse Definite Minimum Time Unit, 7
installed for Phase & Earth Fault, indicating the Phase or Earth Fault involved 10 Breaker has not tripped with the operation of Master Trip Relay (Applicable for 11 KV VCB only) 11 Bus Bar is charged (Not applicable for 11 KV Incoming VCB) 5.16 CLOSING FROM REMOTE: Suitable arrangement should be provided to make it possible for the Nigam to close 11 KV VCB from the remote end, through a communication system to be provided by the Nigam, in case the following conditions are satisfied. Sr. No. CONDITIONS 1 D C is healthy 2 Breaker is Off 3 Breaker is mechanically free to close 4 Spring, for closing mechanism, is charged 5 Trip Circuit is healthy 6 Breaker is not anti pumping 7 Breaker has not tripped with the operation of Instantaneous High Set Element 8 Breaker has not tripped with the operation of Master Trip Relay (Applicable for 11 KV VCB only) 9 Bus Bar is charged (Not applicable for 11 KV Incoming VCB 5.17 TRIPPING FROM REMOTE: Suitable arrangement should be provided to make it possible for the Nigam to trip 11 KV VCB from the remote end, through a communication system to be provided by the Nigam, in case the breaker is on & certain preset conditions, to be decided later on. 6. PROTECTION SHEMES: 6.1 FOR INCOMING PANELS: Each incoming panel shall be provided with a single pole restricted earth fault relay, suitable for 5 Amps C.T. Secondary, with a setting range of 10% to 40% of 5 Amp (strictly in steps of 5%). The relay shall be housed in draw out flush pattern case. The back up protection shall be in the form of combined over current and earth fault relay, consisting of two over current & one earth fault unit which shall be triple pole having inverse definite minimum time (I.D.M.T.) characteristics with a 3/10 time current curve i.e. the relay operating time shall be 3 Second at 10 times the plug setting with T.M.S = 1. The two outer elements of the relay shall be arranged for over current protection and shall have a setting range of 50-200% of 5 Amps, adjustable in suitable equal steps by means of plug boards. The central element shall be used for earth fault protection with a setting range of 20-80% of 5 Amps, adjustable in suitable equal steps by means of a plug board. Each of the three elements shall be fitted with shunt reinforcing unit with hand reset operation indicator. Two nos. over current high set instantaneous elements, having setting range of 500-2000% of 5A and one no. earth fault high set instantaneous element, having setting range of 200-800% of 5A and adjustable in suitable steps, shall be wired in series with the IDMT type over current and earth fault relay respectively. The high set instantaneous element shall have low transient over reach with a high pickup / drop out ratio. The high set instantaneous element shall 8
be so wired so as to take this element (instantaneous) out of circuit, if so desired by the Nigam, at any time during the operation of equipment. 6.2 FOR OUTGONG FEEDER PANELS: The back up protection shall be in the form of combined over current and earth fault relay, consisting of two over current & one earth fault unit which shall be triple pole having inverse definite minimum time (I.D.M.T.) characteristics with a 3/10 time current curve i.e. the relay operating time shall be 3 Second at 10 times the plug setting with T.M.S = 1. The two outer elements of the relay shall be arranged for over current protection and shall have a setting range of 50-200% of 5 Amps, adjustable in suitable equal steps by means of plug boards. The central element shall be used for earth fault protection with a setting range of 20-80% of 5 Amps, adjustable in suitable equal steps by means of a plug board. Each of the three elements shall be fitted with shunt reinforcing unit with hand reset operation indicator. Two nos. over current high set instantaneous elements, having setting range of 500-2000% of 5A and one no. earth fault high set instantaneous element, having setting range of 200-800% of 5A and adjustable in suitable steps, shall be wired in series with the IDMT type over current and earth fault relay respectively. The high set instantaneous element shall have low transient over reach with a high pickup / drop out ratio. The high set instantaneous element shall be so wired so as to take this element (instantaneous) out of circuit, if so desired by the Nigam, at any time during the operation of equipment. 6.3 FOR STATION TRANSFORMER FEEDER PANEL: The back up protection shall be in the form of combined over current and earth fault relay, consisting of two over current & one earth fault unit which shall be triple pole having inverse definite minimum time (I.D.M.T.) characteristics with a 3/10 time current curve i.e. the relay operating time shall be 3 Second at 10 times the plug setting with T.M.S = 1. The two outer elements of the relay shall be arranged for over current protection and shall have a setting range of 20-80% of 5 Amps, adjustable in suitable equal steps by means of plug boards. The central element shall be used for earth fault protection with a setting range of 10-40% of 5 Amps, adjustable in suitable equal steps by means of a plug board. Each of the three elements shall be fitted with shunt reinforcing unit with hand reset operation indicator. Two nos. over current high set instantaneous elements, having setting range of 200-800% of 5A and one no. earth fault high set instantaneous element, having setting range of 100-400% of 5A and adjustable in suitable steps, shall be wired in series with the IDMT type over current and earth fault relay respectively. The high set instantaneous element shall have low transient over reach with a high pickup / drop out ratio. The high set instantaneous element shall be so wired so as to take this element (instantaneous) out of circuit, if so desired by the Nigam, at any time during the operation of equipment. 6.4 FOR 11KV CAPACITOR CONTROL PANEL: The 11KV capacitor control panel shall be provided with the following protection. 6.4.1 The back up protection shall be in the form of combined over current and earth fault relay, consisting of two over current & one earth fault unit which shall be triple pole having inverse definite minimum time (I.D.M.T.) characteristics with a 3/10 time current curve i.e. the relay operating time shall be 3 Second at 10 times the plug setting with T.M.S = 1. The two outer elements of the relay shall be arranged for over current protection and shall have a setting range of 50-200% of 5 Amps, adjustable in suitable equal steps by means of plug boards. The central element shall be used for earth fault protection with a setting range of 20-80% of 5 Amps, 9
adjustable in suitable equal steps by means of a plug board. Each of the three elements shall be fitted with shunt reinforcing unit with hand reset operation indicator. 6.4.2 For the protection of the bank against unbalancing, an inverse time Neutral Voltage displacement relay having setting 5.4, 7.5, 12.5 and 20 volts and suitable for 190 V AC operation shall be provided. The relay will be fed from the open delta connected secondary of residual voltage transformer (Discharge coil) and shall have suitable setting range to afford adequate protection to the capacitor bank against unbalancing. 6.4.3 For over voltage protection of the capacitor bank, over voltage relay; having setting range of 110% to 170% in steps of 10% & rated for 110 Volts A.C. supply, obtainable from the secondary of 11KV Bus P.T s mounted on 11KV Incoming Panel shall be provided. 6.4.4 For under voltage protection of the capacitor bank, under voltage relay; having setting range of 50% to 90% in steps of 10% & rated for 110 Volts A.C. supply, obtainable from the secondary of 11KV Bus P.T s mounted on 11KV Incoming Panel shall be provided. 6.4.5 10 minute adjustable timer contact shall be wired in series with the closing circuit so as to ensure that the capacitor bank is fully discharged, once it has been switched OFF. 7. FREQUENCY OF OPERATION: Mostly the VCB panels are expected to be used for feeding heavily concentrated load. As such they are expected to be subjected to frequent tripping due to overload & earth fault. Any specific design features, adopted or proposed to be provided, by the bidder in the switchgear on this account should be indicated clearly in the tender. 8. TESTS: All type tests & routine tests shall be carried out in accordance with IS: 13118 /1991 (Latest version thereof). The type test certificate shall be supplied as per IS: 13118 / 1991, in quadruplicate along with the tender to judge the adequacy of the equipment offered. In case the offered equipment varies in its details vis-à-vis the certified copy of the drawing annexed with the Type Test Report, the bidder (s) will be required to submit the fresh Type Test Reports. The date of Type Test Report shall be within five years from the date of opening of the bids against this specification. The following Type Tests in respect of VCBs are required to be submitted along with the tender. 8.1 Lightning & switching Impulse voltage test 8.2 Power frequency voltage Test (Dry & wet) 8.3 Temperature rise test 8.4 Measurement of Resistance of main circuit 8.5 Short Time withstand 8.6 Peak withstand current 8.7 Mechanical operation test at Ambient air temperature. 8.8 Basic short circuit test duties (Test duties 1,2,3,4 a, 4 b, 5) and Critical current Test 8.9 Capacitor current switching test The tenders, without Type Test Certificates of the offered equipment, are liable to be rejected. The Type Test Certificates for CTs & PTs, as stipulated in the latest version of IS: 10
3156 & IS: 2705, can be supplied by the successful Bidder after placement of the purchase order, being bought out items. The PT s and CT s shall be subjected to routine tests, as specified in the latest version of relevant ISS in the presence of purchaser - authorized representative, if so desired by the purchaser. The routine test certificates of the bought out component such as relays, switches, indicating instruments & KWH metering will also be presented to DHBVN s authorized inspecting officer who will forward the same to the purchaser along with his inspection report for the main equipment. All test reports should be got approval from purchaser before dispatch of equipment. 9. DRAWINGS & LITERATURE: In addition to any other drawing, which the bidder may like to furnish to explain the merits of his proposal, following drawings shall be submitted along with the tender in quadruplicate:- 9.1 Principal Dimensional Details of 11KV Switchgear. 9.2 ` General arrangement of 7 - panel 11KV switchboard including its foundation details. 9.3 Schematic drawings of control, metering & protection circuits in respect of 11KV incoming VCB, 11KV outgoing VCB including station transformer VCB & 11KV capacitor VCB along with detailed write-up. 9.4 Drawing showing height of 11KV bus bars & arrangements of bus bars. 9.5 Vacuum interrupter drawing. 9.6 Name plate drawing. Four copies of the descriptive literature in respect of 11KV switchgear, relays KWH meters, voltmeters, ammeters and selector switches etc, proposed to be used shall also be supplied. The successful bidder shall submit the above drawings in quadruplicate on A - 3 size paper to the CGM/MM, DHBVN, Hisar for approval. The purchaser shall communicate his comments / approval on / to the drawing to the successful bidder within a period of four weeks. The supplier shall, if necessary, modify the drawings and resubmit four copies of the modified drawings for the purchaser s approval within two weeks from the date of receipt of purchaser s comments. The modified drawings will be approved within 15 days of their receipt. After receipt of approved drawings, a set of reproducible of approved drawings & five sets of all the approved drawings & operating manuals containing, erection, operation & maintenance instructions per 11 KV switchboard shall be supplied to CGM / MM, DHBVN, Hisar for use by various agencies of the purchaser. However, one set of drawing and operating manual will be dispatched along with each 11 KV switchboard. The 11 KV switchgear will not be fabricated without getting the drawing approved from the purchaser. 10. SPECIAL TOOLS: The bidder shall separately quote for a set of special tools, if so required, for erection and maintenance of the switchgear panels. 11. DEVIATION FROM SPECIFICATION: Should the tender wish to deviate from the provisions of the specifications, either on account of manufacturing practice or any other reasons, he shall draw attention to the proposed point of deviation in the tender and submit such full information, drawing and specification so that merits of his proposal may be fully understood. The specification shall be held binding unless the deviations have been fully accepted as requested. 11
12. TRAINING FACILITIES: The successful tenderer(s) may be called to arrange for training of Nigam s Engineer/Technician s at their works so as to make them familiar with the manufacture and assembly process of the equipment, covered in the specification. Two to three engineers/technicians may be sent for a period of 2 weeks and full training facilities shall be made available to them. 13. GUARANTEED AND OTHER TECHNICAL PARTICULARS: These particulars shall be furnished strictly as per Annexure A in duplicate. Any deviation from this specification shall clearly be brought out separately. 14. PLACE OF MANUFACTURE: The bidder shall state the place of manufacture, testing and name of the manufacturer of the various items, included in his tender. 15. STANDARD MARK (S) OFRELAYS/OTHER FITMENTS: Annexure C. The make(s) of relays / other fitments may be restricted to, as depicted in 16. INSPECTION: Inspection of material and supervision of tests, in accordance with the relevant ISS (as mentioned in clause 2 above), approved drawings and schedules shall be carried out by the purchaser or his duly authorized representative. The material shall be inspected and tested, before dispatch, by authorized representative of the Nigam. The manufacture shall provide to the inspecting officer all reasonable facilities, without charge, to satisfy him that the material is being furnished in accordance with the specifications. The purchaser or his authorized representative shall have access, at all reasonable time, to the manufacture s works to inspect and witness the tests of the equipment manufactured. The purchaser has the right to have the tests carried out, at cost of supplier, by an independent Govt. Agency wherever there is a dispute regarding the quality of material supplied. 17. PACKING AND TRANSPORT: The supplier shall be responsible for suitable packing of all the material and ing on the consignment so as to avoid any damage during the transport and storage and to ensure correct dispatch to the destination. 18. VACUUM BOTTLES: The vacuum bottles should be capable of withstanding minimum 100 full short circuit operations as per test duty 1 to 5 of IEC-56. The vacuum bottles, capable of withstanding less than 100 full short circuit faults, would not be considered and therefore should not be offered. 12
A manufacture s type test reports / literature for vacuum bottles, may, therefore be supplied along with tender in duplicate. 19. OPERATING MECHANISM: As clearance between contacts, when VCB is in off condition, is very small, so it is essential that operating mechanism is such that all the three poles open & close simultaneously. 20. INTERLOCKING: conditions. Efficient mechanical interlocking shall be provided to meet the following 20.1 It should be possible to lower / withdraw the breaker only after the circuit breaker has been opened. 20.2 It should be possible to raise or lower the circuit breaker when it is in the fully home position as well as it is in the isolated position. 20.3 It should not be possible to remove the circuit breaker until the moveable plug unit having secondary connections has been with drawn. 20.4 It should not be possible to replace, in position, moveable plug unit & unless the breaker has been racked in. 20.5 Provision of shutters or lock off doors with locks shall be made to prevent access to the bus bar chamber and receptacles when the circuit breaker is withdrawn. 20.6 Provision should be made for locking the circuit breaker closing mechanism in the open position & locks provided. 21. MARKING: ed:- The switchgear panels shall have nameplate carrying the following data indelibly 21.1 Name of the manufacture or a by which he may be readily identified. 21.2 Serial number or type designation making it possible to get all relevant information from the manufacturer and year of manufacture. 21.3 Rated voltage. 21.4 Rated normal Current. 21.5 Rated frequency. 21.6 Rupturing capacity. 21.7 Breaking capacity 21.8 Making capacity. 21.9 Operating D.C. Voltage. 21.10 P.O. No. & Date. GM/P&D CGM/P&D CGM/MM CGM/Commercial 13
GUARANTEED AND OTHER TECHNICAL PARTICLATS FOR 11KV SWITCHGEAR PANELS A. CIRCUIT BREAKERS: 1. Maker s name and country of manufacture. 2. Type 3. Nominal system voltage 4. Highest system voltage 5. Frequency 6. Nominal current rating 6.1 At Ref. Ambient temp. as per relevant standard 6.2 At site conditions 7. Symmetrical breaking capacity (KA and MVA) 8. Asymmetrical breaking capacity (KA) 8.1 Symmetrical breaking current 8.2 Short time current rating for 1 sec. 9. Making capacity (peak KA) 10 1.2/50 microsecond impulse wave withstand test voltage 11 One minute power frequency withstand test voltage 12 No. of poles 13 No. of breaks per pole 14 Length of breaks per phase 15 Opening time (ms) 16 Making time (ms) 17 Arc duration (ms) 18 Type and material of main contacts 19 Material and thickness of plating of contacts 20 Type of arcing contacts and /or arc control device 21 Whether the circuit breaker is trip free 22 Whether lock out mechanism for preventing closing provided 23 Closing coil voltage and power required to close the breaker 24 Minimum clearance in vacuum 24.1 Between phases 24.2 Between live parts & earth 25 Minimum clearance in Air 25.1 Between phases 25.2 Between live parts & earth 26 Short Circuit Type Tests: Certificate or report No. (Attach photocopy) 27 Normal/operating voltage of closing mechanism 28 Total weight of complete breaker ( Kg.) 29 Dimensions and mounting details 30 Standard to which conforms 31 Detail of reference drawing attached. B. INSTRUMENT TRANSFORMERS (CURRENT TRANSFORMERS) 1. Rated primary current 2. Rated secondary current 3. Rated transformation ratio 4. V.A burden at rated current and accuracy. 5. Class of accuracy 6. Rated over current factor with time in seconds 7. Type of CTs ( whether wound or bar type) 8. Standard to which conform 14
9. One minute power frequency withstand test voltage 10. 1.2/50 micro second impulse withstand voltage 11. Make of CT s C RELAYS 1. Type and make 2. Time setting range 3. Other details like No. of auxiliary contacts 4. Standard to which conform 5. No. & Auxiliary contacts D BUS BAR 1. Material 2. Normal current rating in amp. 3. Normal area (mm 2 ) 4. Shape 5. Type of Insulation E. VOLTAGE TRANSFORMER 1. Rated primary voltage 2. Rated secondary voltage 3. Rated burden 4. Class of accuracy 5. Rated voltage factor & time 6. One minute power frequency withstand test voltage 7. 1.2/50 micro sec. impulse withstand voltage 8. Make of PT s F PARTICULARS OF INSTRUMENTS & METERS: 1. Type of equipment(whether flush mounted or projected type) 2. Guaranteed % errors at different loads 3. Make & size of Ammeters, Voltmeters, KWH & Power Factor Meters G PARTICULARS OF VACUUM BOTTLES: 1. Name of manufacture 2. Whether imported or indigenous 3. Manufacturer s type, normal amps and rupturing capacity for vacuum bottles used for Incoming panel 4. ---------------------do---------------------- for outgoing panels 5. ---------------------do---------------------- for capacitor control panel 6. Degree of vacuum inside the vacuum interrupters 7. Short time rating of vacuum bottles 8. Number of full short circuit operations as per test duly 1to 5 of IEC-56, which the vacuum bottles offered can safely withstand 9. Whether the vacuum bottles used on incoming and outgoing panels are same or different. 10. Whether the operating mechanism is imported or indigenous. 15
Annexure-B SCHEDULE OF REQUITEMENT 7 panel, 11KV switchboards with each switchboard comprising of the following as per Nigam s specification No.. 1. 1 No. Incoming panel equipment as below: - a. 1 No. Triple Pole, 350 MVA, 11KV 800 Amps circuit breaker fitted with arc control device, interlocks, auxiliary switches, isolating contacts, emergency hand trip device, mechanical ON and OFF indicator & motor operated spring charging mechanism. b. One set of 3 phase 800 amps bus bars. c. One set of isolating plug and sockets. d. One set of single phase cluster type isolating contacts. e. 1 No. Trifurcating main cable boxes located at the rear of the unit for reception of 3- core XLPE cables of up to 630-mm2 size and complete with wiping glands and clamps. 2. A set of 3 core CT s with ratio 400/200/5-5-5A :- a. One core for REF protection having minimum knee point voltage of 90 X RCT on 400 Amps taps. It shall conform to accuracy class PS of ISS: 2705 (part-iv) and shall have magnetizing current as low as possible but in no case exceeding the value corresponding to class 5P of ISS: 2705 (part IV). b. Second core for over current and earth fault protection with 15VA as out put burdenhaving accuracy of 5P10. c. Third core for metering with 15VA burden output and the class of accuracy as 0.5. 3. 1 No. 3 phase star/star connected bus bar type resin cast draw out voltage transformer of ratio (11000/ 3)/(110/ 3) volts and 100 VA output per phase with class 1.0 accuracy as per IS: 3516 (part-ii)-1965 complete in all respect with HT and LT fuses, isolating plugs and sockets for HT& LT copper connectors, current limiting resistances and first filling with insulating oil. a. 1 No. 230 V.A.C. panel space heater. b. 2 set of vermin and dust proof fitments. c. 1 earthing set for earthing the breakers individually. 4. 1 instrument panel mounted on top and equipped as below:- a. 1 No. suitably sealed C.T s operated static ammeter of 5 Amps. with digital display b. 1 No. 3 way ON/OFF ammeter selector switch. c. 1 No. 0 to 15 KV static voltmeter with digital display. d. 1No. 3 way ON/Off voltmeter selector switch e. 1 No. Static power factor meter for reading both the leading and lagging PF. f. 1 No. 3 elements electronic KWH meter suitable for 3 phase 4 wire unbalanced load conditions with accuracy class 0.5 (as per DHBVN specification) and with RS 485 port with MODBUS protocol for Data Logging/ Data-down-loading facility. 5. One set of triple pole combined over current and earth fault IDMTL relay with two outer elements for over current protection with setting of 50-200% of 5 Amps and central element for E/F protection with setting range of 20-80% of 5 Amps mounted in horizontal draw-out type flush pattern case. 16
One set of high set instantaneous elements, consisting of two elements for over current, having setting range of 500-2000% of 5A and one no. earth fault high set instantaneous element, having setting range of 200-800% of 5A and adjustable in suitable steps having low transient over reach with a high pickup / drop out ratio. The high set instantaneous element shall be so wired so as to take this element (instantaneous) out of circuit, if so desired by the Nigam, at any time during the operation of equipment. 6. One No. single pole restricted E/F relay with setting of 10-40% of 5 Amps and complete with a tuned 50c/s circuit and stabilizing resistance mounted in draw-out type flush pattern case with a provision of inter-tripping the circuit breaker. 7. 4 No. 230 volt A.C. indicating lamps with fittings to indicate breaker open, breaker closed auto trip and spring charged. a. 1 indicating lamp with fitting and push button switch to indicate trip healthy. Trip circuit supervision scheme and D.C. fail scheme as per foregoing specification. b. 1 No Breaker control switch. c. 1set of alarm equipment wired so as to be common to the complete board and comprising of alarm initiating auxiliary relay, alarm bell, indicating lamp and push button for alarm cancellation and lamp resetting. d. 1No. Test terminal block for testing of instrument and relay. 8. 4-Outgoing Feeder Panels each Comprising. 8.1 1No. Triple pole 400 amps 350 MVA 11KV circuit breaker fitted with arc control devices, interlock arrangement, auxiliary switches, isolating contacts, alarm Contacts, emergency hand trip device, mechanism ON&OFF indicators and spring charged closing mechanism operating at 240 V AC motors. 8.2 1set of 3 phase 800 amps bus bars. 8.3 1set of Isolating plugs and sockets. 8.4 1No. Trifurcating main cable box for reception of 11KV, 3-core, XLPE cable of 300mm 2 and complete with wrapping glands and clamps. 8.5 3No. Double core CT s with ratio 300/150/5-5A having one core for metering with 15 VA Burden and Class of Accuracy as 0.5 and the other core with 15VA as burden and Class of Accuracy as 5P 10 for O/C and E/F protection. 8.6 1No. 230V.A.C. panel space heater. 8.7 1 set of vermin and dust proof fitments. 8.8 1intrument panel mounted on top and equipped as below:- 8.8.1 1No. suitably sealed CT operated Static Ammeter of 5 Amps, with digital display 8.8.2 1No. 3-way on/off ammeter selector/switch. 8.8.3 1No. 3 element electronic KWH meter suitable for 3 phase, 4wire unbalanced load and flush mounted with Accuracy class 0.5 (as per DHBVN specification) and with 485 with MODBUS protocol for Data-logging/Data-down-loading facility. 8.8.4 P.T. leads should come direct from 11KV P.T. Secondary to avoid any tempering in between. 1set of triple pole combined O/C and E/F IDMTL relay with two outer elements for O/C protection having setting of 50-200% of 5 Amps and central elements for E/F protection with setting range of 20-80% of 5 Amps mounted in draw-out type flush pattern case. A set of triple pole combined over current & earth fault instantaneous high set relays with two elements for over current protection having a setting range of 500% to 2000% of 5 Amps and the central element for earth fault protection having a setting range of 200%-800% of 5 17
Amps. The relay shall have low transient over reach with a high pick up/drop off ratio. Relay will be connected in series with the triple pole combined over current and earth fault relay referred to above and shall be so wired as to take this element (instantaneous) out if so desired by the purchaser at any time during operation of equipments. 8.9 3 Nos. 230 Volts AC indicating lamps with fittings to indicate Breaker Open, Breaker CLOSED and AUTO TRIP. 8.10 1 Nos. 230 Volts DC indicating lamp with fittings and push button switch to indicate TRIP CIRCUIT HEALTHY. 8.10.01 1 No. Breaker Control switch. 8.10.02 1 No. Test Terminal Block for testing instruments & relays. 8.10.03 1 No. 3 - way ON/OFF Ammeter selector switch. 9. 1-No. Station Transformer Feeder Panel:- 9.1 Similar to item No. 8 but with the following C Ts:- 3 Nos. having double core C Ts of 60/30/5-5 A with one core having 15 VA output as burden and 5P10 accuracy for over current and earth fault protection and the other core for metering having 15VA as burden and class of accuracy as 0.5. 10. 1 No. 11KV Capacitor control panel: 10.01 1 No. Triple pole 400 Amps, 350 MVA, 11KV circuit breaker fitted with arc control device, interlock arrangement, auxiliary switches, isolating contacts, alarm contacts, emergency hand trip device, mechanical ON & OFF indication and under voltage release. 10.02 1 set of 800 A bus bars. 10.03 1set of isolating plugs & sockets. 10.04 1 set of single-phase cluster type isolating contacts. 10.05 1 No. Trifurcating main cable box for reception of 3 core XLPE up to 185 mm2 size and complete with wiping glands and clamps. 10.06 3 Nos. CTs of ratio 200-100-50-/5A with 15 VA output burden of 5 P 10 accuracy for protection 1 No. 230 V AC Panel Space heaters. 10.07 1 set vermin and dust proof fitment. 10.08 1 Instrument panel mounted on top and equipped as below:- 10.08.01 1 No. suitably sealed CT operated static Ammeter of 5 Amp., with digital display. 10.08.02 1 No. 3-way ON/OFF Ammeter selector switch. 10.08.03 3 Nos. 230 VAC indicating lamps with fitting to indicate breaker open, breaker closed and auto trip. 10.08.04 1 No. 24 VDC indicating lamps with fitting to indicate trip healthy. 10.08.05 1 No. Breaker control Switch. 10.08.06 1 set of triple pole combined over current & earth fault IDMT relay with two outer elements for O/C protection having setting of 50-200% of 5 AMPS, and central elements for earth fault protection with setting range of 20 to 80% of 5 amps mounted in drawn out type flush pattern case. 10.08.07 One Set of inverse time Neutral (Voltage) displacement relay suitable for 190 V AC operations for protection of the bank against unbalancing. 10.08.08 One set of over voltage relay with setting range 110% to 170% along with auxiliary transformers (for external mounting) having ratio 121/115 to 127 (in Steps of 1 Volt) to be used for compensating the error of over voltage relay. 10.08.09 One no. under Voltage Relay with setting range of 50% to 90%. 18
10.08.10 10 Minute adjustable timer to ensure that the capacitor bank is fully discharged once it has been switched off before it can be switched ON again. 10.08.11 The capacitor controlling breaker should be suitable to meet all conditions required for capacitor operation and should be suitable for controlling capacitive current up to 400 Amps at 11 KV which is equivalent to 7.5 MVAR approx 110V supply shall be available from existing (11000/ 3) (110/ 3) Volts PT s. Standard make (S) of Relays/Fitments 1 Relays ALSTOM/EASUN REYROLLE/ABB/SIEMENS Or other equivalent reputed make with IS 2 Breaker Control Switch Kaycee/Alstom/Recom or other equivalent reputed make with IS 3 Ammeter/Voltmeter/Selector/Switch Kaycee/Recom or other equivalent reputed make with IS. 4 Static Ammeter/Voltmeter/Static Power Factor Meter with Digital Display 5 Electronic type KILOWATT Hour Meter with RS Port for Data Logging /Data Down Loading Facility AE/IMP/MECO Or other equivalent reputed with IS SECURE/L&T ABB Or other equivalent reputed make with IS 6 PUSH BUTTONS ALSTOM/KAYCEE/VAISHNO Or other equivalent reputed make with IS 7 Indicating lamps with lenses ALSTOM/KAYCEE/VAISHNO Or other equivalent reputed make with IS 8 Cable termination kits DENSON/M-SEAL Or other equivalent reputed make with IS 9 Cable glands DENSON/M-SEAL /COME Or other equivalent reputed make with IS 10 Panel Wiring ECKO/PHOENIX Or other equivalent reputed make with IS 11 Hooter/Buzzer/Bell ANCHOR/KAYCEE Or other equivalent reputed make with IS 12 CTs /PTs VISHAL/CONCORD/ZENITH/SARAF/GYRO Or other equivalent reputed make with IS 19