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UT.TAR HAI{YANA BIJLI VITI~AN NIGAI\1

(SPECIFICATION No. 7-R-2/ PL~D/ DD-II/lJI-IHVN )

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Technical Specifications of

111{V Switch Gear Panel

Vacuum Type

Date~: Issued By : -Chief Engincer/l)D&ClJHBVN Panchkula. ,:

TECHNICAL SPECIFICATION FOR11 KV SWITCHGEAR PANELS VACUUM TYPE WITH 11 KV CAPACITOR

CONTROL PANELS***

1 SCOPE:

This specification covers the design, manufacture, assembly, testi;1g atmanufacturer's works before despatch, supply and delivery r.O.Rdestination of 350 MVA, 11 KV Vacuum type switch.gear panels with 11KV capacitors control panel.

STANDARDS: .The Switchgear panels shall comply in all respects the rsquirement.Iaiddown in the latest editions of IS-3427, IS-3231, IS:2705, IS: 3156 & IS-13118-1991

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3 CLIMATIC CONDITIONS:The equipment is required to operate satisfactorily under the following siteconditions:

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3.1 Max.Ambient Temperature3.2 Min. Ambient Temperature3.3 Max. Relative humidity3.4 Min. Relative humidity3.5 Average no. of rainy days per annum3.6 Average annual rainfall3.7 Average number of dust storm

days per annum.3.8 Isoceraunic level3.9 Max. Wind pressure3.10 Altitude above mean sea level

4.

50°C-2.SoC100 %26%

.Nearly 120 days900 mm35

45'19Skg/Sq.mt

Less than 1000 mts.

TYPE AND RATINGS:The 11 kV Switchgearpanels shall comprise of 11 kV Vacuum Type circuitbreakers, control relay panels, instrument panel and instr~menttransformers complete in all respect etc. suitable for indoor use. The

. equipment shall be totally enclosed in metal clad cubical, dust and verminproof with necessary isolation arrangement. Each Panel shall be ~asilyextensible on either side and should be complete with necessary imernalcopper connections, small wiring, L.1. fuses and s!JPporting frameworkwith bolts to secure it to the floor. Each Panel shall be provided with spaceheater, door switch with lamps and 15-Ampere power receptacle.

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The breakers shall have the following .-atings:4.1 Type4.2 No. of.poles4.3 Normal system Voltage4.4 Highest system Voltage4.S Rated frequency4':6 Rated continuous current rating at

Ambient temperature as specified inIS: 13118-1991

4.7 . Symmetrical breaking capacity4.8 Impulse withstand test voltage.4.9 One minute power frequency

withstand test voltage4.10 Short time current rating4.11 System neutral

Vacuum type311kV12kVSO:t 1.5 Hz800 Amp for incoming400 Amp for outgoing .feeders'.

350 MVA75kV (Peak)28kv (rms)

Not less than 18.4 kA for 1 Second.Solidly earthed.

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5 GENERAL DESIGN OF SWITCHGEAR PANELS:

5.1 OPERATING MECHANISM:The vacuum type circuit breaker shall be trip free and the breaker control shall bedraw out type. The VCBs shall be suitable for operation from 24 V DC auxiliarysupply. The operating mechanism shall be motor operated spring charged type.There shall be provision(s) for manual(chargingof closing spring and emergencyhand trip. The motor used for the purpose will be suitable for 240 V AC. Allauxiliaries shall be supplied from AC and arrangement shall be made forautomatic switch over to DC in case of AC supply failure. The ope'atingmechanism shall work satisfactorilyat 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 relgys, instrument transformers, meteringinstruments, indicating instruments, selector switches & circuit breaker controlswitch. All wiring shall be carried out by using stranded single annealed copperconductor insulated with poly vinyl chloride insulation suitable for 650 V serviceand in accordance with IS: 732-1963. CT/PT circuit shall use wire of not lessthan 2.5 mm2 cross-sectional area whereas control/alarm/supervision circuitshall use wire of not less than 1.5 mm2cross-sectional area. All wires will becontinuous from one terminal to the other and also will have no Tee-junction en-route. The connections shall be securely made with the help of suitable ';;conn~cting lugs duly crimped on to the copper conductor. The meters and relaysshall be mounted in a convenient position so as these are readily accessib,leforinspection or repair. The terminal board provided in the instrument panel of \lGBswill be made of moulded dielectric having brass studs, washers, holding nuts &'locking nuts. All holding nuts shall be secured by locking nuts. The connectionstuds shall project 6 mm from the lock nut surface. NO OTHER TYPE OFTERMINAL BOARD IS ACCEPTABLE. The panels shall have a degree ofprotection of IP-4X. The leads from m'eteringCTs sllall be directly terminated at.TTB and there from at the KWH meter with a provision to seal TIS and KWH

'''meter. The said CT leads will be effectively concealed to prevent their temperingenroute as well as at T.T.B. Similarly PT leads frorn secondary box of the PT toTTB & there from to energy meter including inter panel PT lead~ will also beeffectively concealed to prevent their tempering. The mode and extent ofconcealing the metering leads of CTs & PTs to prevent their tempering (byunscrupulous operating personnel) will be discussed and mutually agreed .uponwith the successful bidder(s). TTB used on the instrument panel should besuitable for front connections.Earthing of current free metallic parts or metallic bodies of the relays/ sw::~hesmountedon the instrumentpaneland metalenclosedswitchgearshall be done ~

by a suitably sized copper conductor..Earth bus made of 2~x3 mm bare copperflat will-be extended through entire length of 11 KV switch-board with suitableprovision to connect it to the sub-station earth at the extremities. The earthingarrangement will meet with the requirements laid down in IS: 3427 read with itslatest amendments.

5,3 INSTRUMENT TRANSFORMER:The secondary voltage & current rating of tile instrument transformers shallmatch with the metering and protective equipment. The CTs shall have ratio &

.,:accuracy class as mentioned in the schedule of requirement. The CTs shall bewound/ring type in accordance with their ratings. The Terminal Boardsassociated with REF CTs & Over CurrenU Earth fault protection CTs will be ofdisconnecting type having short circuiting facility & thus facilita.te secondarytesting of concerned protective relay without disturbing the associated smallwiring. Interchangeability of housing of CTs from one panel to another ml.'.5tbeensured.

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A resin cast potential transformer of ratio (110001"3)/(1101"3) volts 'having'100VA output per phase with accuracy class 0.5 as per ISS: 3156 (part-II) -1965shall be provided on the incoming side of each panel set and shall be starlstarconnected. It shall be provided with HT and LT fuses.

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The neutral point of star connected secondary windings of instrumenttransformers shall be earthed to the main earth bus referred to in the concludingparagraph of clause 5.2. Multiple earthing of any instrument transformers shall beavoided. '

5.4 BUS-BARS:All the panels shall be provided with insulated copper bus bars of 800 Am;.>scontinuous current rating for all switch boards and these shall be connected in aseparate moisture and vermin proof sheet metal chamber. The bus-barsconnections & insulator supports shall be mechanically strong & rigidly supportedso as to withstand the stresses generated by vibrations, variations in temperaturean.9due to severe short circuits. The bus bar should be in vertical formation toenable the UHBVN to connect with existing oil Circuit Breakers Panel Boardswithout any difficulty in matching. The Adopter Panel, if required, to .!natch theloose panels with existing panels shall be prepared 1 fabricated a's per siteconditions by the Nigam at its own cost.

The bus bars shall be supported on insulator at short intervals keeping adequateclearC\lncebetween bus bars and earth. The bus bar chamber shall be providedwith inspection covers with gaskets & bus bar shutters. Provision shall be :nadefor future extension of bus bar & switchboard.

5.5 LIMIT OF TEMPERATURE RISE:The temperature rise of the current carrying parts shall not exceed thepermissible limits above the ambier~ temperature as per relevant standards(latest edition).

5.6 BUSHING INSULATORS:These shall comply with the latest issue of IS: 2099 in all respects.

5.7',' DISCONNECTORS OF CIRCUIT BREAKER & THEIR INTERLOCKS:" .

All disconnector's (isolators) of 11 kV VCBs & interlocks betweeni:differentpieces of apparatus provided for reasons 'of safety & for convenien,:,e of

" operationof switchgearshall meetwith the requirementof IS: 3427-1969readwith its latest amendment.

5.8 CABLEBOXES:

Each 11 kV incoming VCB shall be provided with cable boxes complete withjointing kits & sealing material suitable for receiving 11 kV XLPE, type outer PVCsheathed cable of size 530 mm2.The outgoing 11 kV VCBs including 11' kVcapacitor controlling VCB shall be pr01vided with cable boxes suitable to receive3 core, 11 kV XLPE PVC Sheathed cables of size up to 300 mm2(panel with CTratio 300-150/5-5A). The 11 kV station transformer VCB shall be provided withcable,boxes (Epoxy resin type) suitable to receive 3-core, 11 KV, XLPE cables ofsize up to 50 mm2 (Panel with CT ratio 50-30/S-SA).Each cable box shall havevertical entry from below. These cable boxes shall be complete in all respectsincluding cable glands of requisite size. It is clarified that one jointing kit 1cablebox is required to connect the 11 kV XPLE cable with 11 kV VCB. No se~3rate(extra) jointing kit is required

." 5.9 RELAYS:All relaysshallbe numeric(withRS-port& SCADA compatible) except relays forDC failure alarm, supervision alarm, annunciation alarm shall be:of draw out typeand mounted on the front of each circuit breaker control panel In a flush patterncase.' All relays shall be provided with testing facilities. If the same is notprovided within the relay then a separate test block and test plugs sh~1Ibeprovided. The relay adjustment devices shall be easily accessible whe., therelays have been mounted on the panels.

The relays shall conform to the latest edition of IS: 3231. However the relaysshall not operate at a current .equal to or less than the setting, the minimumoperating current shall not exceed 1.0% of the setting. In case the minirnumoperating current is around 110% then relays coils and C.T. shall be suitable towithstand that current continuously. The relays covers and cases shall be dusttight, moisture and vermin proof. Operation indicators shall be provided on allrelays and on their immediate auxiliaries for indication regarding type of fault andphase/phases involved. It shall be possible to reset the operation indicatorwithout opening the relays contacts. All retays shall be tested at manufacturer'sworks and test certificates got approved before despatch of material. Thetenderer shall submit the descriptive and pictorial literature in quadruplicate inresped of each proposed relay along with the tender. All relays in thespecification shall be suitable for 24 V D.C. auxiliary voltage.

6. ALARM EQUIPMENTS:The incoming feeder panel shall be provided with one alarm bell and alarmindicating auxiliary relay. It shall indicate automatically the tripping of any circuitbreaker under fault conditions with the help of auto trip lamp and alarm. It shallbe complete with the indicating lamp and push button switches for "Accepts"'and"Resets" for alarm.6.1 SUPERVISION SCHEME:

11kV switchgear panels covered by this specification shall be provided with thefollowing indication lamps/relay:Circuit breaker 'open' GreenCircuit breaker 'close' RedAuto trip WhiteCircuit Breaker Spring charged Blue

For monitoring of trip circuit healthy both in open and close position of the drcuit '

breaker, 1 no. Automatic trip circuit ~upervision relay is proposed for the '11 I<V.incoming panels. In case of trip circuit becoming faulty, ihe operation of thisrelay shall be accompanied by visual and audio annunciation. It shall be possibleto silence the buzzer by pressing the accept push button and lamp shall continueto glow till the fault has been attended to. '

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Circuit breaker 'Close' & 'Open' lamps shall be wired so as to be on 240 V ACunder 'normal' condition.

6.2 METERING SCHEME

Each of the 11 KV VCB will be provided with a suitably sealed rligitalammeter(additional dials, if any, required to cover all the taps of the eTs shall beincluded at the time of bidding) with a selector switch facilitating measurement ofphase currents as well as unbalanced current. The static digital ammelei shallbe rated for 5 Amp. the instrument shall be static type of industrial gra(~e 'A'classification having accuracy class 1-.0& shall conform to IS:1248(1968).Each of the 11 KV VCB will be provided with a suitably sealed digital Voltmeterwith a selector switch. The selector switch shall facilitate the measurement ofphase to phase & phase to neutral voltage of all the three phases one by oneThe static voltmeter shall be rated fo,. 110 V (phase to phase). The instrument

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shall confirm to IS:1248(1968). .Each of the 11 KV VCS except the 11 KV capacitor VCS will be equipped with athree-phase four wire KWH meter. The KWH meter shall be rated for 5A CTsecondary and'11 01'>/3(phase to neutral) available from 11 KV PT mounted oneach of the incoming VCS. The instrument shall be electronic type KVVHmetersuitable for three-phase four-wire unbalanced load conditions with accuracy class0.5 and with RS-port for Data-logging l Data-down-Ioadingfacility.Each of the 11 KV (incoming) VCS will be provided with a static power factormeter. The static PF meter having a range of 0.5 lag -one-O.S lead shall be ofstatic type suitable for use on three phase three wire unbalanced system. It shallbe rated for 5A CT secondary & 110 Volts (phase to phase) available from 11 KVPT mounted on each of the 11 KV incoming VCS. The instrument shall be statictype having accuracy class 1.0 with Digital display.' .

NOTE: Routine test certificates of all the indicating & integrating instruments willbe submitted alongwith the routine test certificates of 11 KV switchgear.

6.3 PADLOCK:Padlock or some other arrangement of approved design shall be provided forlocking the equipment in 'OFF' position. All locks shall have two keys in additionto wh!ch a master key shall also be provided for each panel set. Approved racksor 'cabinets for accommodation of padlocks and keys while in use shall beprovided along with each panel set and it shall be suitably labeled and numberedfor identification.

6.4 AUXILIARY SWITCHES:In addition.to the auxiliary switches required for normal operation & control eachcircuit breaker shall be provided with 2 NO + 2 NC spare contacts duly wired upto terminal block.

7. PROTECTION SCHEMES:7.1. FOR INCOMING PANELS:Each incoming type of panel shall be provided with a single pole restricted earthfault numeric relay suitable for 5 amps. C.T. (Secondary) with a setting range of'10%.to 40% of 5 amperes (strictly in steps of 5%). The relay shall be hou~ed indraw out flush' pattern case. The back up protection shall be in the form ofcombined over current and earth fault numeric relay (two over current & earthfault). This shall be triple pole havin~ inverse definite minimum time (I.O.M.T.)Characteristics with a 3/10 time current curve i.e. the relay operating time shallbe 3.;:;econdat 10 times the plugs seHingat a T.M.S=1. Th~ two outer elementsof the relay shall be c;irrangedfor over current protection and shall have a settingrange of 50-200% of 5 amps and adjustable in suitable equal steps by means ofplug boards. The central element shall be used for earth fault protection with asetting range of 20 - 80% of 5 amps adjustable in suitable equal steps :by rn~~nsof a plug board. 'Each of the three elements shall be fitted with shunt reinforcingunit with hand reset operation indicator.

7.2 FOR OUTGOING FEEDER PANELS:Each outgoing feeder panel shall be provided with a Triple pole, 400 amps., 350MVA, 11kV circuit breaker fitted with their control devices, interlock arrangement,auxiliary switches, isolating contacts, alarm contacts, emerge'ncy hand tripdevice, mechanical On & Off indicator.1 set of 3 phase 800 amps bus bars.1 set of Isolating plugs & sockets.1 set of single-phase cluster type isolating contacts.1 no. Trifurcating main cable box for reception of 3 core 11 kV XLPE cable up to300 mm sq. size and complete with wipping & clamps.

II..3 no. Double core CT's with ratio 300/150/5-5A. having one for metering with 15VA as burden and class of accuracy as 0.5 and other core have 15VA as burdenwith class of accuracy as 5P10 for Over Current & Earth Fault protection.1 No. 230 V A.C. panel space heater.1 set of vermin & dust proof fitments.1 Instrument panel mounted on top and equipped as below:1 no. Suitable sealed CT's operated ammeter of 5 amps.1 no. 3 way ON/OFF Ammeter Selector/Switch.1 no: 3 elements Electronic kWh meter suitable for 3 p;hase. 4 wirebalance/unbalanced load & flush mounted with accuracy 0.5 (as per UHBVNspecification).and withHS-port for Data-logging/ Data-qown-Ioadingfacjlily;:-1 set of triple pole combined O/C & E/F IDMTL numeric relay with two outerelements for O/C protection having' setting of 50-200% of 5 amp and centralelementof E/F protectionwith settingrangeof 20-80%of 5 amps . mountedindrawn out type flush pattern case.1 set of triple pole combined over current and earth fault instantaneous high setnumeric relay with two outer elements for over current protection having a settingrange of 500% to 2000% of 5 amps and the central element for earth faultprotection having a setting range 200-800% of 5 amps. The relay shall have lowtransient over reach with a high pick up/drop of ratio. The relay will be connectedin series with the triple pole combined over current and earth fault relay re'l'~rredto above and shall be so wired as to take this (instantaneous) out if so desired bythe purchaser at any time during operation of equiprnent. .J3 nos. 230 V A.C. indicating lamps with fittings to indicate breaker open, breakerclosed & auto trip. 1 no. 24 V D.C. indicating lamps with fittings & push button

." switch to indicate trip healtilY. 1 no, '3reaker control switch. 1 no. Test terminalblock for testing instruments and relay.

7.3 FOR STATION TRANSFORMER FEEDER PANEL:3 no. Double core CT's with ratio 60/30/5-5 A having one for metering with 15VAas burden and class of accuracy as 0.5 and other core have 15 VA as burdenwith class of accuracy as 5P10 for Over Current & Earth Fault protection.. .'1 No. Trifurcating main cable box for receiving XLPE cable up to 50 mm sq. size

& complete in all respect.

One set of triple pole combined O/C & E/F IDMTL numeric relay with two 'Juterelements for' O/C protection having setting of 20-80% of 5 amps. and cGntralelement for E/F Protection with setting range of 10-40% of 5 amps mounted indrawn out type flush pattern case.

1 Ser of triple combined over current and earth fault instantaneous numeric relaywith two elements for over current protection having setting range of 200-800%of 5 A and Central element for earth fault protection having setting range of 100-400% of 5A and adjustable in suitable steps. The relay shall have low transient

'.' over each with a high pickup/drop of ratio. The relay will be connected in serieswith the triple pole combined over current and earth fault relay referred to abovein series with triple pole combined over current and earth fault re.layrE~ferredtoabove and shall be so wired so as to take this (instantaneous) out if so desiredby the purchaser at any time during operation of equipment.

7.4 FOR 11 KV CAPACITOR CONTROL PANEL:The 11 kV capacitor control panel shall be provided with the following protet'.ion.i) The protection shall be provided in the form of a combined over current

and earth fault.numeric relay (two over-current and one earth fault). Tilisshall be triple pole having inverse definite minimum time (I.D.M.T.)

. characteristics with 3/10 time current curve Le. the relay operating timeshall be 3 second at 10 time e~a T.M.S. = 1. The two outer elements ofthe relay shall be arranged for over current protection and shall have asetting range of 50-200% of 5.amp and adjustable in suitable equal stepsby means of a plug board. The central element shall be used for earth

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fault protection with a setting range of 20-80% of 5 amps adjustable insuitable equal steps by means of a plug board. Each of the three elementsshall be fitted with shunt reinforcing unit with hand reset operQtionindicator.

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ii) For the protection of the bank against unbalancing an inverse time Neutral(Voltage) displacement numeric relay with settings 5.4, 7.5, 12.5 and 20volts and suitable for 190V A.C. operation shall be provided. The relay willbe fed from the open delta connected secondary of residual v01tage

." transformer (Discharge coil) and shall have suitable setting range to ~ffordadequate protecHon to the capacitor bank against unbalancing.

iii) For over voltage protection of the capacitor bank inverse time over voltaqenumeric relay suitable for operation with 110 volts A.C. supply obtainablefrom the secondary of 11 kV Bus P.T.'s mounted .on 11 kV, incomingpanel shall be provided. The relay shall have a setting range of 110% to170% in steps of 10%.

iv) Under voltage numeric relays with setting range of 50% to 90% of 110Volt(phase to phase connections).

v) 5 minute timer to ensure that the capacitor banl<is fully discharged once ithas been switched OFF before it can be switched ON again.

8. FREQUENCY OF OPERATION:

The panels are mostly to be used for feeding heavily concentrated load. As .;uch,they may be expected to be subjected to frequency tripping on overload & 'earthfaults, Any specific design features adopted or proposed to be provided by thebidder in the switchgear on this account should be indicated in his tender.

9. TESTS:All type & routine tests shall be carried out in accordance with IS: 13118 (1991)(Latest edition thereof).' '.:The type test certificate shall be supplied as per IS:13118(1991), in quadruplicatealong with the tender to judge the adequacy of the equipment offered by theoffer. In case the offered equipment varies in its details vis-a - vis the certifiedcopy of the drawing annexed with the Type test reports, the Bidder(s) wit! berequired to submit the fresh Test Reports, whose date of testing I proving theequipment will be within five years from the date of opening of the Bids againstthis specification. The following Type Tests in respect of VCBs are required to besubmitted along with the Tender.i) Lightning & switching Impulsevoltage testii) Power frequency Voltage Test(Dry & Wet)iii) Temperature rise testiv) . Measurement of Resistance of main circuitv) Short Time withstandvi) Peak withstand currentvii) Mechanical operation test at Ar;,bient air temperature.viii) Basic short circuit test duties(Test duties 1, 2, 3, 4 8, 4 b, 5) and Critical

.:currentTestix) Capacitor current switching test .

The tender without Type test certificates of the offered equipment is liable t~ berejected. The type test certificates for CTs & PTs as stipulated in the' latestversion of 15:3156 & 15:2705 can be supplied by the successful Bidder afterplacement of the PO being bought out items.The PT's and CT's shall be subjected to routine tests as specified in the latestversion of relevant ISS in the presence of purchaser's authorized representative,if so desired by the purchaser. The routine test certificates of the bougl-,t outcomponent such as relays, switches, indicating instruments & KWH metering willalso be presented to UHBVN's authorized inspecting officer who will forwardthem to the purchaser alongwith his inspection report for the main equipment. All

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test reports should be got approved from the purchaser before despatch ofequipment.

. 10. DRAWINGS & LITERATURE:In addition to any other drawing which the bidder may like to furnish to explainthe merits of his proposal, following drawings shall be submitted with the tenderin quadruplicate.

i) Principal dimensional details of 11 KV switchgear.

ii) . General arrangement of 7 panel 11 KV switchboard including itsfoundation details..'

iii) Schernatic..drawingsof control, metering & protection circuits in respect of11 KV incoming VCB, 11 KV outgoing VCB including station' transformerVCB & 11 KV capacitor VCB alongwith detailed write-up.

iv) Drawing showing height of 11 kV bus bars & arrangements of bus bars.. .

v) Vacuum interrupter drawing.

vi) Name plate drawing.\

Four copies of the descriptive literature in respect of 11 kV switchgear relays,KWH meters, voltmeters, ammeters and selector switches etc., proposed to beused shall also be supplied.The succesBful bidder shall submit the above drawings in quadruplicate on A-3size paper to the CE/PD&C, UHBVN, Panchkula for approval. The purchasershall communicate his comments/approval on/to the drawing to the succ'>ssfulBidder within a period of four weeks..The supplier shall, if necessary, modify the9rawings & resubmit four copies of the modified drawings for the purchaser'sapproval within two weeks from the date of receipt purchaser's comments. Themodified drawings will be approved within 15 days of the their re~eipt, by thepurchaser. After receipt of purchaser's approval to drawings', a set ofreproducible of approved drawings & five sets of all the approved drawings &operating manuals containing, erection, operation & maintenance instructions per11 KV switchboard shall be supplied to CE/PD&C, UHBVN, Panchkula for use byvarious agencies of the purchaser. However, one set of drawing and operatingmanual will be dispatched alongwith each 11 KV switchboard. The 11 KVswitchgear wjll not be fabricated without getting the drawings approved from thepurchaser.

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11. SPECIAL TOOLS:The tenqerers shall separately quote for a set of special tools, if so required. forerectionandmaintenanceof theSwitchgearpanels. ·

12. DEVIATION FROM SPECIFICATION:Should the tenderer wish to deviate from the provisions of the specificationseither on account of manufacturing practice, or any other reasons, he shall drawattention to the proposed point of de'/iation in the tender and submit such full'fnformation,drawing and specification so that merits of his proposal may be fullyunderstood. The specification shall be held binding unless the deviations havebeen fully recorded as required above.

13. TRAINING FACILITIES:The successful tenderer(s) may be called to arrange for training of Nigam'sEngineerlTechnician's at their works so as to make them familiar with themanufacture and assembly process of the equipment covered by thespecification. Two to three engineers / Technicians may be sent for a period of 2weeks and full training facilities shall be made available to them.

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16. STANDARD MAKE (S) OF RELAYS/OTHER FITMENTS:The make(s) of relays/other fitments may be restricted to, as depicted IIIAnnexure 'C'.

17. INSpECTION:Inspection of material and supervisic;mof tests in accordance with the relevantISS as mentioned in clause 2 above and supporting drawings and schedules,and approved manufacturer specification shall be carried out by the purchaser orhis duly authorized representative. The material shall be inspected and testedbefore dispatch by an authorized representative of the Nigam in respect ofquality. The manufacturer shall provide to the inspecting officer all reasonablefacilities without charge to satisfy him that the material is being furnished inaccordance with the specifications.

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14. GUARANTEED AND OTHER TECHNICAL PARTICULARS:These particulars shall be furnished strictly as per Annexure 'A' in duplicate. Anydeviation from this specification shall clearly be brought out separately.

15. PLACE OF MANUFACTURE:The tenderer shall state the place of manufacture, testing and name 0,f themanufacturer of the various items included in his tender.

The purchaser or his authorized representative shall have access . t allreasonable time to manufacturer's works to inspect and witness the tests uf theequipment manufactured.

The purchaser has the right to have the tests carried out at the cost of supplier byan independent Govt. Agency wherever there is a dispute regarding the qualityof material supplied.

18. PACKING AND TRANSPORT:The supplier shall be responsible for suitable packing of all the material andmarking on the consignment so as to avoid any damage during the transport andstorage and to ensure correct dispatch to the destination.

19. VACUUM BOTTLES:The vacuum bottles should be capable of withstanding minimum 100, Full shortcircuit operations as per test duty 1 to S of IEC-56. The vacuum bottles capableof withstanding less than 100 full short circuits would not be considerec.:andtherefore should not be offered. A manufacturer's type test reportslliterature forvacuum bottles, may, therefore be supplied along with tender in duplicate.

20. OPERATING MECHANISM:As clearance between contacts when vacuum breaker is in off condition is verysmall so it is quite essential that operating mechanism is such that all the threepoles open & close simultaneously. There should be. absolutely no timedifference between opening & closing of three poles.

21. ,INTERLOCKING:Efficient mechanical interlocking shall be provided to meet the followingconditions:

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i) It shall be possible to lower/withdraw the breaker only after the circuitbreakerhasbeenopened. "

ii) It shall be possibleto mise or lower the circuit breaker both wher, it is inthe fully home position as well as it is in the isolated position.

iii) It shall not be possible to remove the circuit breaker until the moveable. plug unit having secondary connections has been withdrawn.

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iv) It shall not be possible to replace in po::'ition!he moveable plug u'lit l'lk:;,sthe breaker has been racked in.

v) Provision of shutters or lock off doors with locks shall be made to preventaccess to bus bar chamber and recf!ptacles when the circuit breaker iswithdrawn.

vi) Provision shall be made for locking the circuit breaker closing mechanismin the open position & locks provided.

22. MARKING:The Switchgear panels shall have nameplat:.~carrying the foHowingdata indeliblymarked: .

a) Name of the manufacturer or a mmi~ bv which he may be !""'adily

,/' . identified.

b) Serial number of type designation making it possible to get all relevant

information from the manufacturer and year or manufacture.

c) Rated voltage.

d) Rated normal current.

e) :.Ratedfrequency.

f) Rupturing capacity.

g) Operating D.C. Voltage.

h) P.O. No. and Date.

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I\NNEXlIIU: '/\'

GUARANTEED AND OTHER TECHNICAL PARTICULARS FOR '11 KVSWITCHGEAR PANELS

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A, CIRCUIT BREAKERS:1. Maker's name and country of manufacture.2. Type3. Nominal system voltage4. Highest system voltage5. Frequency6. Normal current rating

a) At Ref. Ambient temp. as per relevant standardb) At site conditions

7. Symmetrical breaking capacity (KA and MVA)/8. Asymmetrical breaking capacity (KA) .

9. a) Symmetrical breaking currentb) Short time current rating for 1 sec.

10. Making capacity (peak KA) .11. 1.2/50 microsecond impulse wave withstand test voltage12. One.minute power frequency withstand test voltage13. No. of poles14. No. of breaks in circuit per pole15. Length of break per phase16. Opening time (ms)17. Making time (ms)18. Arc duration (ms)19. (A) Type and material of main contacts

(B) Material and thickness of plating of contacts20. Type of arcing contacts and/or arc control device21. (A) Whether the circuit breaker is trip free?

(B) .Whether it is with lock out prevE::ntingclosing22. Closing coil voltage and power required to close the breaker23. . (A) Minimum clearance in vacuum

i. Between phasesii. Between live parts & earth

(8) Minimum clearance in Airi. Between phasesii. Between live parts and earth

24. Short..CircuitType Tests:Certificate or report No.(Attach photocopy)

25. Normal/operatingvoltage of closing mechanism26. Total weight of complete breaker kg.27. Dimensions arid mounting details28. Standard to which conforms29. Detail of Reference drawings attached.8. INSTRUMENTTRANSFORMERS(Current Transformers)1. Ra~edprimary current2. Rated secondary current3. Rated transformation ratio4. V.A. output at rated current and accuracy5. Class of accuracy6. Rated over'current factor with time in seconds7. Type of CTs (whether wound or bar type)8. Standard to which conform9. One minute power frequency withstand

test voltage10. 1.2/50 micro second impulse withstand voltage11. Make or CT's

..

'.

;~ C~"r .

1.2.3.4.5.

Page I.~ (\1' I -:

NUMERIC RELAYSType and make

" Time setting range. Other details like No. of auxiliary contacts

Standard to which conformNo. & Auxiliary contacts

BUS BARMaterialNormal current ratingNominal areaShapeType of Insulation

VOLTAGE TRANSFORMERRated primary voltageRated secondary voltageRated burdenClass of accuracyRated voltage factor & timeOne minute power frequencywithstand test voltoge1.2/50 Micro-sec. Impulsewithstand test voltagE!Standard to which conformMake of PT's

PARTICULARS OF INSTRUMENTS& METj::RSType of equipment (whether flush mounted or projocted type)Guaranteed % errors at different loadsMake& sizeof Ammeters,Voltmeter~,KWh 8. PO'N8r Fa::;tor.Meters

PARTICULARS OF VACUUM BOTTLESa. Name of manufacturerb. Whether imported or indigenousc. Manufacturer's type, normal amps and Rupturing Capacity for vacuum bo'tlles

used on Incoming paneld. do on outgoing panelse. do ~ on capacitor control panelf. Degree of vacuum inside the vacuum interruptersg. Short time rating of vacuum bottlesh. Number of full short circuit operations as per test duty 1 to 5 of IEC-56, which

the vacuum bottles offered can safely withstanc1 wi

I. Whether the vacuum bottles used on Incoming and outgoing panels are sameor different?

J., Whether the operating mechanism is impmted or indigenous?

Signature of supplier

D.1.2.3.4.5.

/

E.

1.2.3.4.5.6.7.8.9.

F.1.")L.

3.

G.

__ 0 -- --'

. .ANNEXURE 'B'

.. SCHEDULE OF R~REMENT

7 panel, 11 KV switchboards with each switchboard comprising of the followingas p~r Nigam's Specification No. 7/P&D/DD-II/UHBVN.

1.01 1 No. Incoming panel equipment as below:"

1 No. Triple Pole 350 MVA, 11 KV 800 amps circuit breaker fitted with arc controldevice, interlocks, auxiliary switches, isolating contacts, emergency hand tl ipdevice, mechanical 'ON' and 'OFF' indicator & motor operated spring chargedmechanism.

One set of 3 phase 800 amps bus bars.One set of Isolating plugs and sockets.One set of single-phase cluster type isolating contacts.1 No. Trifurcating main cable boxes located at the rear of the unit for reception of3-core XLPE cables of up to 630-mm2 size and complete with wiping glands andclamps.A set of 3 core CT's with ratio 400/200/5-5-5A --

- One core for REF protection having minimum knee point voltage of 90RCT on 400 amps taps. It shall conform to accuracy class PS ofISS:2705 (part-IV) and shall have magnetising current as 10.,'/ aspossible but in no case exceeding the value corresponding to class SP of18S:2705 (Part IV).

. - Second core for over current and earth fault protection with 15VA as output burden-having accuracy 0"15P-1O. .

- Third core for metering wi.th 15VA burden output and the class ofaccuracy

as 0.5.

1 No. 3 phase star/star connected bus bar type resin cast draw out voltagetransformer of ratio (11000/"3)/(110/"3) volts and 100 VA output per phase 'withclass 1.0 accuracy as per IS:3516 (Part - 11)-1965completein all respectwith HTand LT fuses, isolating plugs and sockets for HT & LT copper connectors, currentlimiting resistances and first filling with insulating oil.1 No. 230 V AC. Panel space heater.2 set of vermins and dust proof fitments.1 earthing set for earthing the breakers individually.1 instrument panel mounted on top and equipped as below:

. 1 No. Suitably sealed C.T.'s operated static ammeter of 5 amps.. withdigital display

.,.1 NO.3 way ON/OFF ammeter selector switch.1 No. 0 to 15 KV static voltmeterwith digital display. .1 No. 3 way On/Off voltmeter selector switch. ..1 No. Static Power factor meter for reading both the leading and"IaggingPF. .1 No. 3 elements electronic KWH meter suitable for 3 phase L1.wireunbalanced load conditions with accuracy class 0.5 (as per UHBVNspecifications) ~r:ld~ with RS-port for'Data-logging I Data~down-Ioadingfacility. .

One set of triple pole combined over current and earth fault IDMTL numeric relaywith two outer elements for over current protection with setting of 50-200% of 5amps an9 central element for E/F protection with setting range of 20-80% of 5amps mounted in horizontal draw-out type flllsh pattern case.One No. Single pole restricted E/F numeric relay with settings of 10-40% of 5amps'and complete with a tuned 50ch circuit and stabilizing resistance mounted

:w""I -

. in draw-out type flush pattern case with a provision of inter-tripping the circuit.breaker.

4 No. 230 volt A.C. indicating lamps with fittings to indicate breaker or->en,breaker dosed, auto trip and spring charged.

1 indicating lamp with fitting and push button switch to indicate trip healthy. Tripcircuit supervision scheme and D.C. fail scheme as per ioregoing specificatioh.

1.:No. Breaker control switch.

1 Set of alarm equipment wired so as to be common to the complet~ board andcomprising of alarm initiating auxili8ry relay, alarm bell, indicating lamp and pushbutton for alarm cancellation and lamp resetting.

1/' 1 No. .Test terminal block for testing of instrument and relay.

1.02 4 -Outgoing Feeder Panels each Comprising:

1 No. Triple pole 400 amps 350 MVA 11kV circuit breaker fitted with arc controldevices, interlock arrangement, auxiliary switches, isolating contacts. alarmcontacts, emergancy hand trip device, mechanical On and Off indicator andspring charged closing mechanism operating at 240 Volts AC motor. ';p

1 Sefof 3 phase 800 amps bus bars.1 Set of Isolating plugs and sockets.

1 No. Trifurcating main cable box for reception of 1'1 KV, 3-core, XLPE cable of300 mrn2 and complete with wipping glands and clamps.

3Nos. Double Core CTs with ratio 300/150/5-5A having one core for meteringwith 15 VA Burden and Class of Accuracy as 0.5 and the oUler cor~ with 15VAas burden and Class of Accuracy a~ 5P 10 for O/C and E/F Protection.1 No. 230V A.C. panel space heater.1 Set of vermin and dust proof fjtments.1 instrument panel mounted on top and equipped as below:

1 No. Suitably sealed CT operated Static Ammeter of 5 amps., with digitaldisplay1 No. 3 way on/off ammeter selector/switch.1 No. 3 element electronic KWH meter suitable for 3 phase, 4 wireunbalanced load and flush mounted with Accuracy class 0.5 (as perUHBVN specification) and with RS-port for Data-logging / Data-cown-loading facility.

P.T. leads should come direct from 11 KV P.1. Secondary to avoid anytempering in between. 1 set of triple pole combined O/C and E/F IDMTL numericrelay with two outer elements for O/C protection having setting of 50-200% of 5amps.and central elements for E/F pr0tection with setting range of 20-80% of 5amps mounted in draw-out type flush pattern case. A set of triple pole combinedover current & earth fault instantaneous high set numeric relays with twoelements for over current protection having a setting range of 500% to 2000% of5 amps. and the central element for earth fault protection having a s~tting rangeof 200-800% of 5 amps. The relay shall have low transient over reach'with a highpick up/drip off ratio. The relay will be connected in series with the triple polecombined over current and earth fault numeric relay referred to above and shallbe so wired as to take this (instantaneous) out if so desired by the purchaser atany time during operation of equipments.3 Nos. 230 Volts AC indicating lamps with fittings to indicate Breaker OPEN,Breaker CLOSED and AUTO TRIP.1 No. 24 Volts DC indicating lamps with fittings and push button switch toindicate TRIP CIRCUIT HEALTHY.

Page J() pf 17-

1 No. Breaker Control switch.1 No. Test Terminal Block for testing instruments & relays.1 NO.3-way ON/OFF Ammeter selector switch.

1.03 1- No. Station Transformer Feeder Panel:Similar to item No. 1.02 but with the following CT's :-3 Nos. having double core CT's of 60/30/5-5 A with one core having 15 VAoutput as burden and 5 P 10 accuracy for over current and earth fault protectionand the other core for metering having 15 VA as burden and class of accuracy as0.5. .

1.04 1 No. 11 kV Capacitor Control Panel: ,

1 No. Triple pole 400 Amps., 350 MVA, 11 kV circuit breaker fitted with arccontrol device, interlock arrangement, auxiliary switches, isolating contacts,alarm contacts, emergency hand trip device, mechanical ON & OFF indicationand under voltage release.1 set of 800A busbars. .

1 set of isolating plugs & sockets. ,1 set of single-phase cluster type isolating contacts.1 No. Trifurcating main cable box for reception of 3 core XLPE up to 185 mm2size and complete with wiping glands and clamps. .3 Nos. CT's of ratio 200-100-50-/5Awith 15 VA output burden of 5P 10 accuracyfor protection 1 No. 230 V AC Panel space heaters.1 set vermi:nand dust proof fitment.1 Instrument panel mounted on top and equipped as below:1 No. Suitably sealed CT operated St?tic ammeterof 5 A, with digital display1 NO.3 way ON/OFF ammeter selector switch. .3 Nos. 230 V AC indicating lamps with fittings to indicate breaker open, breakerclosed and auto trip.1 No. 24 V DC indicating lamps with fitting to indicate trip healthy.1 No. Breaker Control Switch.A) 1 Set of triple pole combined over current & earth fault IDMT numeric relay

.' with two outer elementsfor O/C protectionhaving setting of 50-200%of 5, Amps., and central element for earth fault protection with setting range of 20

to 80% of 5 amps mounted in drawn out type flush pattern case. . .

B) 1 set of inverse time Neutral (Voltage) displacement numeric relay.:suitablefor190 V AC operationsfor protection of the bank against unbalancing.

C) 1 set of InverseTimeover voltagenumericrelaywith settingrange 110(%to17-0% along with auxiliary transformer (for external mounting) ratio 121/115to 127 (in steps of 1 Volt) to be used for compensating the error of overvoltage relay.

D) 1 No. Under Voltage numeric Relay with setting range of .50%to 90%.E) 5-minute timers to ensure that the capacitor bank is fully discharged once it

has been switched off before it can be switched ON again.

The capacitor controlling breaker should be suitable to meet all cone.!,ionsrequimd for capacitor operation and should be suitable for controllingcapacitive current up to 400 Amps. at 11 kV, which is equivalent to 7.5MVAR, approx. 110 V supply shall be available from existing (11000/~3)(110/.J3)Volts PT's.

\J,

~:

2,

4

0,

7.

8.

9.

Page 17 (JI 1-'

Annrxul'l' 'C'

STANDARD MAKE (S) OF REI ,AYS/FITJ\1 ENTS

1. NUMERIC RELAYS

BREAKER CONTROL SWITCII

1\~'1METER/VOLTMETER/SELECTOR/SWITCII

STATIC AMMETER/VOLTMETER/STATIC POWER FACTOR METERWiTH DIGITAL DISPL,\ Y

AI..STOM I EASlJNRFYROLLUABBISILMI:NS

or other equivalcnl repuledwilhiS Inark

1</\YCEF/J\LSTOf\.I/REC<Hvl

tIt" olher equivalcnt reputedwith IS mark

K /\ YCEE I IZECOi\1

or olher cquivalcnt reputedwilh IS mark

lllake

AE / 1MI'I MECO

or olher equivalcnt repuledwilh IS mark "

Elcctronic type KILOWATT IIOUR METERwithRS.pOI1for Data-loggingI Data-down-loadi.ngfacility

).

PUSH BUTTONS

INDICATING LAfvlPSWIl'li LENSES

CABLE TERMINATION KITS

CABLE GLANDS

10. PANEL WIRING

II. I-lOOTERI BUZZERI BELL

12. CTs I PTs

SECURE/L& rit\IW

or other cquivaklllreputed make

wilh IS millk

ALSTOM/KA YCEE/V AISIINO

or pther equivalcnt rcpukd Inah'wilh IS mark,\LSTOM/KA YCEEIV AISIII':()

or (.Jlhercquivalent r('(Hllcd 11Ial.,-,with IS mark

DENSON I M-SEAL or olhcrequivalent reputed makewilh IS mark

DENSON / M-SEAL I C01\.II.:":

or other equivalent reputed make,wilh IS markECKO/PHOENIX

or otherequivalentreputedmakewith IS markANCI-IOR/KA YCEE

or other equivalent reputed makewilh IS markVISIIAL/CONCORD/ZENITJ II

SARAF/GYRO or other rc:pllt(~dmakes with IS mark