iti data centre iti - tender.itiltd-india.comtender.itiltd-india.com/bgp/tenders/elec ht tech...

Date :04/12/17Version :00

TECHNICALBIDFORELECTRICALHTWORKFORPROPOSED

ITIDATACENTREAT:ITI,BENGALURU.

CLIENT

ITIAT:BENAGALURU.DATECENTRECONSULTANT

TRIMAXITINFRASTRUCTURE&SERVICESLTDAT:MUMBAI

(Contractor’sStamp&Signatur)s

ITI DATA CENTER @ BENGALURU TRIMAX IT INFRASTRUCTURE

BIDDER’S SIGN & STAMP TECHNICAL SPECIFICATION 2

TECHNICALSPECIFICATIONFORELECTRICALWORK

11KVSWITCHGEAR1 VCB1.1.1 Scope Manufacturing,testingandsupplyingofintegratedcubicletypemetalclad,form3a,floormountedanddrawouttypefreestanding,frontoperatedindoortype11KVswitchgearasperspecificationsgivenbelow: System TheswitchgearenclosureshallconformtodegreeofprotectionIP4X. TheswitchgearshallbemadefromMSsheetsteel2mmthick(CRGO)andshallbefoldedandbracedasnecessarytoprovidearigidsupportforallcomponents. Theswitchgearassemblyshallformacontinuousdeadfrontlineupoffreestandingverticalcubicles.Eachcubicleshallhavealockablefronthingeddoorandaremovableboltedbackcover.Allcoversanddoorsshallbeprovidedwithneoprenegaskets.Suitablearrangementforliftingofeachcubicleshallbeprovided.Designandconstructionoftheswitchgearshallbesuchastopermitextensionateitherend. VacuumCircuitbreakershallbeprovidedwithsurgearrestingdeviceforprotectionagainstlightningandswitchingovervoltage.Twoseparateanddistinctconnectionstoearthshallbeprovidedforeachsurgearrestor.1.1.2 BreakerCompartment VacuumCircuitBreakershallbemountedindrawouttruckwithfrontplatewhichcoversthecubiclewhenthebreakerisinserviceposition.ThisfrontplateshallbeprovidedwithviewglasstofacilitateobservationofmechanicalON/OFFindicationofCircuitbreaker,Springcharged/dischargedindicationandoperationcounter.Necessaryorificeshallbeprovidedformanualchargingofthesprings.ON/OFFpushbuttonforopeningandclosingofthecircuitbreakershallalsobeprovided.ThedrawouttruckshallhavetwopositionsforthecircuitbreakerVIZisolated/Test&Service. 1.1.3 BusBarCompartment Busbarsofrectangularcrosssectionofcopperconductorsupportedbycastepoxyinsulatortowithstandfullshortcircuitcurrentsupto26.3for1sec.for22KVsystemshallbeprovidedattherear.Busbarchambershallbeprovidedwithinterpanelbarrierswithepoxycastsealoffbushings. 1.1.4 CTandCableCompartments AttherearofthepanelsufficientspaceshallbeavailabletoaccommodatethreenumbersepoxyCT’sofdoublecoreandtwonumbersthreecorecabletermination.Thecableentryshallbefromthetop/bottom.



1.1.5 SeparateCompartments Circuitbreakers,instrumenttransformer,busbars,cableetcshallbehousedinadistrictdifferentcompartmentsasrequiredforform3a,compartmentalization.Allrelays,switches,lamps,etc.comprisingthecontrol,indicationandprotectivedevicesshallbehousedinaseparatecompartmentonthefrontofthecubicle.



1.1.6 TechnicalParticularsofVCBCircuitBreaker

S.NO. DESCRIPTION 11KVA RatedCurrent 800AB RatedVoltage 24KVC RatedFrequency 50Hz

D RatedShortCircuitbreakingCurrent26.3KAfor1sec

E Ratedshortcircuitmakingcurrent(KAP) 66KA

F Insulationlevel(KVrms/KVP) 50KV/125KV

1.1.7 EarthingSwitch Cableearthingswitchshallbeprovidedinthecablechamberandshallbeoperatedfromthefrontofthepanel.TheON/OFFpositionofswitchshallbeindicatedbymechanicalindicator.Theearthingswitchshallbesuitablyinterlockedwiththebreaker,sothatitcanbeoperatedonlywhenthebreakerisinOFFposition. Earthingswitchshallalsobeprovidedonbusbarside.TheON/OFFSwitchshallbeindicatedbymechanicalindicator.Theearthingswitchshallbesuitablyinterlockedwiththebreaker,sothatitcanbeoperatedonlywhenthebreakerisinOFFposition.1.1.8 IsolatingContacts Thebreakerisolatingcontactsshallconsistoftwoparallelflatsilverplatedcopperbarswithballpointcontactstogiveaverticaltoleranceof±10mm.1.1.9 LowVoltagePlugandSocketConnector Atwentypinplugandsocketconnectionalongwithflexibleleadsshallbeprovidedtoconnectcontrolinstrumentationandinterlockcircuitsonthebreakertruckandinthepanel.Theplugandsocketassemblyshallbesuitablyinterlockedwiththetruckpositionslikeserviceandtest/isolatedposition1.1.10 InterlocksandSafetyDevices Thefollowinginterlocksshallbeprovided:a. Thetruckcannotbemovedfromeithertesttoservicepositionorviceversa,whenthecircuitbreakeris‘ON’.b. Thecircuitbreakercannotbeswitched‘ON’whenthetruckisinanypositionbetweentestandserviceposition.c. Frontpartofthetruckcannotberemovedwhenthebreakerin‘ON’position.d. Thelowvoltageplugandsocketcannotbedisconnectedinanypositionexcepttest/isolatedposition.e. Thetruckcannotbemovedinsidethepanel,whentheLTplugandsocketisdisconnected.f. Earthingswitchcannotbeswitched‘ON’whenthetruckisinsidethepanel. g. Thetruckcannotbeinsertedwhentheearthingswitchis‘ON’.



1.1.11 SafetyDevices ThefollowingSafetydevicesshallbeprovidedforthesafetyoftheoperatingpersonnel:a. Individualexplosionventsshallbeprovidedforbreaker/busbar/cablechambersonthetopofthepaneltoletoutthegasesunderpressuregeneratedincaseoffaultinsidethepanel.b. CubiclewithfrontplatetowithstandthepressureforinternalarcfaultasperPEHLArecommendation.c. Circuitbreakerandsheetmetalenclosureshallbefullyearthed.d. Selflockingshuttersshallbeprovidedwhichshallcloseautomaticallywhenthetruckiswithdrawnto‘Testposition’andnoseparatepadlockingoftheshuttershallberequired.1.1.12 ProtectiveEarthing Theearthingconnectionbetweenthetruckandthecubicleshallbebymeansofslidingcontactssothatthetruckisearthedintheisolatedpositionwheninsertedandremainsearthedwhenthetruckispushedfurtherintotheconnectedpositionorwhenthetruckisbeingwithdrawnuntilthetruckhasmovedparttheisolatedposition.1.1.13 CurrentTransformer I. GeneralRequirements Accommodationshallbeprovidedinthecircuitbreakerpanel,tomountonesetofduelratioCT.AccesstotheCTSforcleaning,testingorchangingshallbefromthefront,backortopofthepanel. II. Rating DuelratioCTSofsuitableburden(buteachnotlessthan15VA)shallbepreferredwith5ampssecondaries. InstrumentSecurityFactor(ISF)ofeachCTshallnotbemorethan5. TheCTsshallconformtorelevantIndianStandards.Thedesignandconstructionshallbedrytype,epoxyresincastrobusttowithstandthermalanddynamicstressesduringshortcircuits.CTterminalsshallbeshortingtype.Current&voltagecircuitsshallbelaidinseparatewireways.SecondaryterminalsofCTSshallbebroughtouttoasuitableterminalblockwhichwillbeeasilyaccessibleforterminalconnections.Testterminalblockshallbeprovidedinthefrontsideofthepanelfortestingpurpose. CT’Sshallhave2Nos.ofcoresforfollowingapplication: Core-1 formetering Core-2 forovercurrent&earthfaultprotection. Classofaccuracyofeachwinding Meteringclass 1



Protectionclass 5P101.1.14 PotentialTransformersThepotentialtransformersshallbeconfirmingtoIS3156/IEC60185.Theprimarywindingsofthepotentialtransformersshallbeinsulatedandshallbeofthecastrestintype.Potentialtransformer(PT’S)shallbemountedonadrawouttrolleyandhousedinseparatemetalcompartmentandshallhavecontrolfusesontheH.V.sideandaminiaturecircuitbreakerontheL.V.sideofthewindings.HTHRCControlfusesshallbeconfirmingtoIS–9385/IEC–60282.MiniatureCircuitbreakershallcomplywithIS–8828/IEC–60898.Padlockingfacilitiesshallbeprovidedforbothserviceandisolatedposition.Thepotentialtransformershallbeasspecifiedbelow:Ratio : 22000V3/110/V3/110VVABurdan : 100VAfor100/V3and110VwindingClass : CL–1forboththewindings.BasicInsulationlevel : SameasmentionedforVCBinclause-6.Overvoltagefactor : 1.2ContinuousSinglephasePT’SshallbeusedandshallbeconnectedinStar/Star.1.1.15 ProtectionandTrippingArrangement ProtectionAllprotectionrelayshallbenumerictypeofapprovedmake. Theprotectionandtrippingarrangementofcircuitbreakershallbe:i. NumerictypeinstantaneousshortcircuitprotectionDeviceNo.50Range500–2000%shallbeprovidedonallphases.

ii. NumerictypebackupovercurrentprotectionforPhasefaultsDeviceNo.51Range50–200%shallbeprovidedonallphases.

iii. NumerictypegroundfaultprotectionDeviceNo.50G.CT’s.Range20–80%shallbe

provided.

iv. Lockoutandtripsupervisoryrelaysetcshallbeprovidedwithmanualresetfacility.

v. Auxiliaryrelayfortransformerfault.

vi. SurgeArrestor



1.1.16 ControlWiring Thecontrolwiringshallbecarriedoutwithminimum2.5sq.mm.PVCinsulatedcopperconductorcables.Thewiringshallbesecurelyfixedandneatlyarrangedtoenableeasytracingofwires.IdentificationPVCferrulesshallbefittedtoallwireterminalstorendereasyidentificationandfacilitatecheckinginaccordancewithIS5578and11353.1.1.17 MeteringInstrumentPanelAccessories I. MeteringDigitaltypeTrivectormeterofapprovedmake(Smartdemandcontroller)shallbeprovidedontheincomerfeeder.Specificationofthemetershallbeasfollows: Accuracy : Class0.5,complianttorevenueclasscertification. : Realtimemeasurementperphase&average V,I,PF,KW,KVAR,KVA : Peakdemand,slidingwindow.Protected. : V&Iunbalance,Phasereversal : TimeofUse(TOU) PowerQualityMeasurement: : TotalHarmonics Logging&recordingforallmeasurements: : Intervalorevent-based,32channelmeasurement. &recording : Eventlogging : “Bust”datarecording : Min/Maxrecording Alarming : Over&undermeasurementdetectionby24setpoint functions. Multiport Communication: OneeachofRS485andRS232ports(withopen protocol) II. InstrumentPanels Theinstrumentpanelshallbepartofthehousing.Relays,metersandinstrumentsshallbemountedaspergeneralarrangementdrawingstobesubmittedbythevendors.Theyshallbeofflushmountingtype. III. Instrumentations



a) DigitaltypeVoltmeterofclass1.0accuracyand96x96mmsquareinsizeasperIS-1248shallbeprovidedatincomerpanel,withselectorswitch.Theinstrumentshallbecalibratedfortherangesspecified.

b) DigitaltypePowerfactormeterofclassof1.0accuracyconformingtoIS:1248shallbe

providedatincomerpanel.

c) DigitaltypeAmmeterofspecifiedrangetoclass1.0accuracyand144x144sqmminsizeasperIS-1248shallbeprovidedatbothincomerandoutgoingpanelsalongwithnecessaryselectorswitches.

d) Digitaltypefrequencymeterclassof1.0accuracyconformingtoIS:1248shallbe

providedatincomerpanel.IV. Thefollowingminimumindicationlampsshallbeprovidedinthefrontofcubicle. Breakeropen/closed/tripped,springcharged,tripcircuithealthyandcontrolsupplyhealthy.LampsshallbeclusteredLEDtypeandtripcircuitsupervisionschemeshallbeofcontinuoussupervisiontype.V. Aftermeetingallnecessarycontrolandindicationrequirements2nos.NOand2nos..NCauxiliaryofthebreakershallbemadeavailablefortheowner,wireduptoterminalblock.VI. SeparateMCB’sshallbeprovidedforlamps,heatersandotherinstrumentationetc.oneachpanel.VII. Anti-condensationspaceheaterssuitableforoperationon240Vsinglephas,50HzA.C.foreachcubicleandwiththermostatcontroloneincandescentlampwithswitchand3pin5ampsplugsocket.1.1.18.Drawings/DocumentsRequiredForReview/Approval Followingdrawingsdocumentsshallbesubmittedbythemanufacturerforapproval.a. Generalarrangement(GA)ofequipmentlayout.b. Equipmentlist.c. Relayandmeteringsystemschematics.d. Supplyanderectionschedule.e. Catalogueandspecificationsheets.1.1.19.InspectionandTesting AftermanufacturingofswitchgearpanelstestsshallbecarriedoutontheequipmentasperrelevantISandElectricityRegulations.



1.1.20.QualityAssurance Vendorshallsubmitinsubstantialdetailaqualityassuranceplanindicatingallactivitiesstepbystepatvariousmanufacturing/fabricationstagestomeettherequirementofthisspecificationandvariousstandards/regulations/practicestoenablecomprehensiveassessmentofitsmeritsandreliability.2. AUXILIARYEQUIPMENTFORSUB-STATION:2.1 BatteryChargerUniti General ThebatterychargershallbeFloatcumBoosttypeThyristorcontrolled.ThechargershallhaveselectorswitchforAutoFloat–Boost/ManualFloat/ManualBoostModeofoperation.DuringAutoFloat–BoostMode,AutomaticChangeovershalltakeplacefromFloatModetoBoostmodeandVice-Versa.ThismeansthatwhentheBatteriesarefullychargedthechargingshallautomaticallychangefromBoostchargetotricklecharge.ii. ConstructionFeature FloatcumBoostchargerandDCDistributionBoardshallbehousedinsheetsteelcubiclewithpanelsof1.6mmthickness,louversforventilationglandsplatewillbeprovidedforcableentryfrombottom.ThecubicleshallbepaintedinSiemensgreyshadeRAL-7032.Thebatterychargerisdividedintotwocompartments.Theuppercompartmenthousesthebatterychargerwithallthenecessarycontrols.Thelowercompartmentissuitableforhousingthebatteries.iii. Performance TheD.CoutputvoltageofFloat/Boostchargershallbestabilizedwithin+2%forACinputvariationof230V+10%,frequencyvariationof50Hz+5%andDCloadvariationof0-100%.ThevoltageregulationshallbeachievedbyaconstantvoltageregulatorhavingfastresponseSCRcontrol.Theripplecontentwillbewithin3%ofDCoutputnominalvoltage. ThereshallbeprovisiontoselectAutoFloat/ManualFloat/ManualBoostmodes.DuringAutoFloatModethebatterychargingshallautomaticallychangeoverfromBoostModetoFloatModeandViceVersa.DuringManualFloat/Boostmodesitshallbepossibletosettheoutputvoltsbyseparatepotentiometers. Thebatterychargershallhaveautomaticoutputcurrentlimitingfeature.iv. Components Thebatterychargershallessentiallycompriseofthefollowing 1No.doublepoleON/OFFMCBatACinput. 1No.pilotlamptoindicatechargerON. 1No.MainTransformer:Doublewound,naturallyaircooled,havingcopperwinding.1setsinglephasefullwavebridgerectifierconsistingof2Nos.diodesand2Nos.SCRs,liberallyrated,mountedonheatsinksandcompletewithresistor/condensornetworkforsurgesuppression.



1No.rotaryswitchtoselectautofloat/manualfloat/manualboost.Duringautofloatmodeautomaticchangeovershalltakeplacefromfloatmodetoboostmodeandviceversa.1setsolidstateconstantpotentialcontrollertostabilizetheDCoutputvoltageofthefloatcumboostchargerat+2%oftimesetvalueforACinputvoltagevariationof230V+10%,frequencyvariationof+5%from50Hzandsimultaneousloadvariationof0-100%andalsocompletewithCurrentLimitingCircuittodroptheFloatChargeroutputvoltageuponoverloadstoenablethebatterytotakeover.1No.electroniccontrollertoautomaticallychangeoverbatterychargingfromboosttofloatandviceversa..1No.DCammeterandtoggleswitchtoreadchargeroutputcurrentandbatterycharge/dischargecurrent.1No.movingcoilDCvoltmetertoreadtheDCoutputvoltage.2setpotentiometertoadjusttheoutputvoltageduringmanual/autofloatandboostmodes.1No.doublepoleON/OFFMCBforChargerOutput(24VDCRating).2setDCoutputterminals.1setfortheloadandtheothersetforthebattery.AlarmAnnunciation:Visualandaudiblealarmwithmanualacceptresetfacilityshallbeprovidedforthefollowing:a. ACmainsfailb. ChargerFailc. Load/Outputovervolt. Rating

ACInput : 230V+10%AC50Hzsinglephase.

DCOutput : Tofloat/boostcharge24V/200AHbatteriesandalsosupplyacontinuousload.

CurrentRating : 30.0Amps

FloatMode : 27.0Vnominal(Adjustable)between24-28.0V.

BoostMode : 28.2Vnominal(Adjustable)between24-29.0V.

VoltageRegulation : +2%forACinputvariationof230V+10%.FrequencyVariationof50Hz+5%andDCloadvariation0-100%

Ripple : Lessthan5%



v. DCDistributionBoard Itshallbeprovidedinthechargingcubicle,itwillcomprisesofthefollowing: Incoming :1No.63ADPMCB Outgoing :10Nos.16ADPMCB2.2 SafetyEquipmentDangerPlateDangerplateshallbeprovidedonHVandMVequipment.MVdangernoticeplateshallbe200mmx150mmmadeofmildsteelatleast2mmthickwithvitreousenamelledwhiteonbothsideandwithinscriptioninredcolouronfrontside.FireExtinguishersPortableCO2conformingtoIS:2878-1976,anddrychemicalconformingtoIS:2171-1967shallbeprovidedintheSub-station.RubberMatsforElectricalPurposeMaterials:Matsshallbeofvulcanizedrubbercompoundfreefromfabricinsertionsandfibrousmaterials.Theuppersurfaceshallhaveribblesoranyotherpattern,thethicknessshallnotbelessthan6.5mmattherootofthepattern.Thematerialshallbefreefromblisters,pinholes,cracks,embededforeignmattersandotherdefects.



3.TECHNICALDATAFORSWITCHGEARCUBICLETYPEWITHVCBBREAKERTENDERERMUSTFILLINTHEFOLLOWINGTECHNICALDATA VCBBREAKER 3.1 SwitchgearCubicle i. Make ii. Type iii. ReferenceStandard iv. Voltage(System/Rated) v. Phase/Frequency vi. ShortCircuitRating a. InterruptingSymmetrical b. Shorttimefor1/3sec.3.2Construction i. DrawoutfeatureforCircuitBreakerwithService Test&Disconnected ii. Minimumclearspacerequiredat: a. Frontforbreakerwithdrawl b. Rear iii. Overalldimension&Operatingweight3.3BusBar i. Material&grade ii. Referencestandard iii. Crosssectionalareasize iv. Continuouscurrentat40degC v. Maxtempriseoverfor40degC vi. Shorttimecurrentfor1/3sec. vii. Minclearanceofbarebusbar& connection a. Phasetophase b. Phasetoground



VCBBREAKER 3.4CircuitBreaker i. Make ii. Type iii. Ratedvoltage iv. Ratedfrequency v. No.ofpoles vi. Ratedcurrent a. Continuousat40degC&within cubicle b. Shorttimecurrentfor1sec/3sec3.5 Max.tempriseover40degCambient3.6Ratedoperatingduty3.7Interruptingcapacityatratedvoltage andoperatingduty a. Symmetrical3.8Ratedmakingcurrent3.9 No.ofbreakeroperationspermissible withoutrequiringinspectionforrefilling SF6gasreplacementofcontacts&other NotApplicable mainparts. a. At100%ratedcurrent b. At100%ratedshortcircuitcurrent3.10Typeofcontacts a. Main b. Arcing3.11Minclearanceinair a. Betweenpoles b. Betweenliveparts&ground3.12Operatingmechanism a. Type



b. No.ofbreakeroperationsstored c. Tripfreeorfixedtrip? d. Antipumpingfeaturesprovided3.13ClosingCoil a. Voltage b. Permissiblevoltagevariation c. Powerrequiredatratedvoltage3.14Breaker/breakercubicleprovidedwiththe following: a. Mech.safetyinterlocks b. Automaticsafetyshutter c. Emergencymanualtrip d. Mech.ON/OFFindicator e. Operationcounter f. Springcharge/dischargeindications g. Manualspringchargingfacility h. MechanicalAntipumping3.15Netweightofthebreaker3.16Impactloadforfoundationdesign3.17Overalldimensionsinmm



4.TECHNICALSPECIFICATIONSFORTRANSFORMERS

4.0 SCOPE Thisscopecoversdesign,manufacture,inspection&performancetestingatmanufacturer’s

works,deliveryF.O.RSiteincludingpacking,forwarding,loading,transportationtosite,unloadingatsiteofTransformersofcapacityasmentionedintheBOQandDatasheets,11/0.433kV,ONANcooled,Dyn11connectedtransformersprovidedwithOnloadtapchangerhavingtapchangerangeof+5To-15%instepsof1.25%onHVwinding.

4.1 AtthediscretionofthePurchaser,BIDDERmayhavetoundertakesupervisionoferection,

testingandcommissioningoftheequipmentsupplied.Pricesfortheaboveshallbeseparatelyindicatedascalledforinpriceschedule.

4.2 Thetransformersshallbeprovidedwithoilnatural,airnatural(ONAN)methodofcooling.The

transformersshallbeprovidedwithdetachabletype,builtonradiatorsandaccessories.4.3 TheHV&LVwindingsofalltransformersshallbebroughtoutthroughsuitablyratedbushings

mounted on non-magnetic material in separate air insulated cable box with non-magneticglandplate.Thecableboxesshallbeprovidedwithfacilityforsupportingfromthegroundaswell.

4.4 TheneutralpointoftheLVwindingshallbebroughtoutseparatelythroughsuitablyrated

bushings,onintheLVterminalboxandotherontopoftransformertankforearthling.Two(2)nos.50x6mmcopperstripearthflats,suitablysupportedon1.1kVpintypeinsulatorsfixedtothetankbodyfrombushingtogroundlevelshallbeprovided.

4.5 Dissolvedgasanalysisof theoil shallbeperformed twice,beforeandafter temperature rise

test.Separatepriceshallbeindicatedforthistest.5.0 CODESANDSTANDARDS Thedesign,manufactureandperformanceofequipmentshallcomplywiththerequirements

ofthecodesandstandardsIS-2026orlatest

5.0 DESIGNANDPERFORMANCEREQUIREMENTS5.1 TheVENDORshallindicatehisrecommendedspareswithquantity&unitprices.

5.2 TransformersshalloperatewithoutinjuriousheatingattheratedkVAatanyvoltagewithin+/-10percentoftheratedvoltage&+/-3%offrequency.

5.3 Transformersshallbecapableofdeliveringtheratedcurrentatavoltageequalto105percentoftheratedvoltagewithoutexceedingthelimitingtemperaturerise.



5.4 Overloadsshallbeallowedwithintheconditionsdefinedintheloadingguideoftheapplicablestandard.Undertheseconditions,nolimitationsbyterminalbushings,orotherauxiliaryequipmentapply.

5.5 CORE5.5.1 Themagneticcircuitshallbeconstructedfromhighgradecoldrollednon-aginggrainoriented

siliconsteellaminations.

5.5.2 Theinsulationstructureforthecoretoboltsandcoretolaminationplatesshallbesuchastowithstandavoltageof1500Vforoneminute.

5.6 TANK5.6.1 Tanktogetherwithradiators,coolers,conservator,bushings,vesselandotherfittingsshallbe

designedtowithstandpermanentdistortion,thefollowingconditions:

a) Fullvacuumof760mmofHg.forfillingwithoilbyvacuum.

b) Internalgaspressureof0.35kg/cm2(5lbs./sq.in)withoilatoperatinglevel.

5.7 VALVES5.7 Eachtransformershallbeprovidedwithfollowingvalvesonthetank:

a) Drainvalvesolocatedastocompletelydrainthetank.

b) Filtervalveattopoftransformertank,oneof50-mmsize.

c) Oilsamplingvalves.

d) One15-mmairreleaseplug.

e) Valvesbetweenradiatorsand/orcoolers.

f) Two-pluggedpipeoutletsforapplyingvacuum.

5.8 TAPCHANGINGGEAR5.8.1 On-LoadTapChangingGear TheonLoadtapchangershallbeprovidedwithMarshallingBox(LocalPanel)alsooperableby

meansofanoperatinghandlebroughtoutsidethetankandoperablefromgroundlevelmanually.Thesameshallbewithautomaticvoltageregulatorforautomaticvoltagechangeover.Itshallbeequippedwithanindicatingdevicetoshowthetapinuseandshallbeprovidedwithalockingarrangementtolocktheswitchinposition.ThereshallbeaRemotetapchangecontrolpaneltobelocatedinMainM.V.PanelRoom.All

ControlcablingtoRTCCpanelwillbeinthescopeofTransformerManufacturer.

5.9 BUSHINGS5.9.1 Bushingsshallbedesignedandtestedtocomplywiththeapplicablestandards.



5.9.2 BushingsshallbesolocatedonthetransformersthatfullflashoverstrengthwillbeutilizedandminimumclearanceasrequiredfortheBILshallberealizedbetweenlivepartsandlivepartstoearthedstructures.

5.10 CABLEBOXESANDDISCONNECTINGCHAMBERS1. 3.10.1 Asconnectionarebycables,disconnectingchambersshallbeprovidedfordisconnecting

andmovingawaythetransformerwithoutunsealingthecablesordrainingoilformthemaintank,havingthecableboxorchamberbehindonPurchaser’sexternalsupports.

3.11 FITTINGSANDACCESSORIES Fittings&accessoriesasindicated,butnotinlimitedto,shallbeprovided.3.11.1 Inspectionmanhole(s)withcover(s).3.11.2 Liftinglugsoreyesforliftingoffullyassembledtransformerbycrane.3.11.3 Jackingpads,at least four innumber,at suitableheight, for lifting thecomplete transformer

filledwithoil.3.11.4 Liftingarrangements for (a)completetransformerfilledwithoil, (b) fortheassemblyofcore

andcoilsandhaulingeyesoneachfaceofthetransformer.3.11.5 Neutral earthling bar of copper of specified section installed from the neutral bushing to

ground level suitablysupportedalong its runonporcelain insulators, togetherwithclampingarrangementsatneutralbushingandfortwoPURCHASER’Searthconductors.Thesupportinginsulatorsshallbetankmounted.

3.11.6 Terminalmarkingandratingplatesshallbeasperthespecifiedstandard.3.11.7 Conservatorfortransformer.Theconservatorshallbeofsufficientvolumetomaintaintheoil

sealfromtheminimumtemperatureof–5deg.Cuptoanoiltemperatureof100deg.C,withoil level varying within the minimum and maximum visible levels. The conservator shall beprovidedwiththefollowingaccessories:

a) Fillingplug,sumpanddrainvalve. b) 150mmdiametermagnetictypeoillevelgauge. c) Aboltedcoveratoneendforcleaning.

d) Valveforshuttingoffoiltothetransformer.

e) Weather-proofdehydratingbreatherwithsillica-gel. 3.11.8 Pressurereliefdevice.3.11.9 GasandOilActuatedRelay(BuchholzRelay) AdoubleflattypeBuchholzrelaysasperspecifiedstandardshallbeprovided.Allgasevolved

in the transformer shall collect in this relay. The relay shall be provided with a test cock



suitableforaflexiblepipeconnectionforcheckingitsoperation.A5mmcopperpipeshallbeconnected from the relay test cock to a valve located about 1.25M above ground level tofacilitate sampling with the transformer in service. The device with two electricallyindependent ungrounded contacts, one for alarm on gas accumulation and the other fortripping on sudden rise of pressure. These contacts shall be wired upto transformermarshallingbox.Therelayshallbeprovidedwithshut-offvalvesonconservatorsideaswellasthetankside.

3.11.10 TemperatureIndicators3.11.11 DialTypeThermometer All transformers shall be provided with dial type thermometer for top oil temperature

indication.Thethermometershallhaveadjustableelectricallyindependentungroundedalarmandtripcontacts,maximumreadingpointerandresettingdevice.Thecontactsshallberatedminimum0.5Amakingand0.2Abreakingat220VD.C.

3.11.12 Asetofhydraulicjackssuitableforthetransformerundersupply.3.12 TESTS AlltransformersshallbecompletelyassembledatWorkstoascertainthatallpartsfitcorrectly.3.12.1 RoutineTests Routinetestsasperspecifiedstandardsshallbeperformedonalltransformers.Thefollowing

additionalpointsmaybenoted. a) Resistanceofeachwindingofeachphaseshallbemeasuredat principal and at all the

tapsandcorrectedto75deg.C. b) Impedancevoltageshallbemeasuredatprincipalandatallthetaps. c) Noloadlossandexistingcurrentshallbemeasuredatrated frequency at 90%, 100%

and330%ratedvoltage.Thesetests shall be done after impulse tests if the latter arespecified. Excitingcurrentshallbemeasuredoneachphaserecorded.Form factorshallbenotedduringthetestandincludedinthetestreport.

d) Noloadlossandexcitingcurrentshallbemeasuredandrecorded with 415V, 3

phase,50Hz.inputonLVside(assumingLVis ratedhigherthan415V). e) OilLeakageTest:Themaintransformertankandalloilfilledcompartmentsnecessaryfora

completetransformerincluding coolersshallbefilledwithtransformeroilandsubjectedtoa pressure of 0.35 Kg/cm2, above the pressure that would be obtained under normalconditionswith full headof oil. Thepressure shall bemaintained for 12hours duringwhichtimeno oilleakageshalloccur.Whenheatruntestisspecified,theoil pressure test shallbeperformedimmediatelyafterheatrun. Otherwise the testmaybeperformedatambienttemperature.

f) Magneticbalancetestfor3phaseunits. g) Calibrationoftemperatureindicatorsandrelays.



h) Measurementofzerosequenceimpedance.3.12.2 TypeTests ThetypetestsshallbecarriedoutbytheVENDORasper IS:2026ifsodesiredbyPurchaser.

BiddershallfurnishtypetestcertificatesalongwiththeBid.3.12.3 TestReports Testresultsshallbecorrectedtoareferencetemperatureof75deg.C TwocopiesofpreliminarytestresultsshallbesubmittedforthePURCHASER’Sapprovalbefore

despatchoftransformer. Additionalboundcopiesofcompletetestresultsincludingalltestsontransformers,auxiliaries,

currenttransformercharacteristicsshallbefurnishedwiththetransformer.NumberofcopiesanddistributionscheduleswillbeintimatedtosuccessfulBIDDER.

3.12.4 PerformanceTests The following additional tests shall be conducted atmanufacturer’sworks and price for the

sameshallbeincludedinthebaseoffer:3.12.5 HVTestonMagneticCircuit Afterassembly,eachcoreofthetransformershallbesubjectedtoavoltageof1500VACfor

durationofoneminutebetweenallbolts,sideplatesandstructuralsteelwork.Thetestshallbe conductedonce again just prior todespatchof the transformer from theManufacturer’sWorks.Thesetestsshallbeconductedasroutinetestoneachtransformerincludedunderthiscontract.

3.12.6 PressureTestonReliefDevice Thepressurereliefdeviceofeachsizeofferedshallbesubjectedtooilpressure.Thetestshall

be conducted with increasing oil pressure and the device shall be checked for operatingpressure.Thedeviceshallalsobecheckedtoensurethatitsealsoffaftertheexcesspressurehasbeenrelieved

3.12.7 VacuumTestonTransformerTankandRadiators The transformer tank shall be subjected to full vacuum and thereafter tested at an internal

pressureof3.33KN/sq.m(25mmofHg)foronehour.Thepermanentdeflectionofflatplatesaftervacuumhasbeenreleased,shallnotexceedthevaluespecifiedbelowwithoutaffectingtheperformanceofthetransformer.

Horizontallengthofflat Permanentdeflection Plate(inmm) (inmm) --------------------------------- ------------------------------ Uptoandincluding1500 5 751to1250 6.5



1251to33500 8 1751to1500 9.5 2001to2250 33 2251to2500 12.5 2501to3000 16 Above3000 19 Thistestshallbeconductedononetransformerofeachratingspecified.3.12.5 PressureTestonTransformerTankandRadiators Thetransformertanktogetherwithradiators,conservatorandotherfittingsshallbesubjected

to a pressure corresponding to twice the normal head of the oil or water to the normalpressureplus35kN/sq.m,whichever is lower.Theappliedpressureshallbemeasuredatthebaseof thetankandmaintainedforonehour. Thepermanentdeflectionof flatplatesafterthe excess pressure is released shall not exceed the values specified above. This shall beconductedononetransformerofeachratingspecified.

4.0 TERMINALPOINTS ThefollowingitemsshallbeincludedintheVENDOR’Sscopeofsupply:Interconnecting cables with supporting and terminating accessories for connections between

thetransformermainmarshallingkioskandallelectricalmeasuring,monitoringandprotectivedevices mounted on the transformer. For this purpose, either PVC insulated wires in G.IconduitsorPVCinsulated,armouredcablesbeused.

4.1 Necessary compression type,brass cable glands shall beprovidedat themarshallingbox for

thecablesmentionedaboveaswellasforterminatingthePURCHASER’Sincomingcablesfromremotepanels.

4.2 Tenpercentextraoil inadditiontothatrequiredforfirstfillingofcompetetransformershall

besuppliedinnon-returnabledrums.4.3 BushingterminalclampssuitableforconnectingthePURCHASER’Sconductor.4.5 Allnecessarysealingendswithglands,compound,tapes,cablelugs,armourearthlingclamps

andaccessoriesrequiredforterminationofthePURCHASER’Scableswherevercableboxesarespecified.

5.0 START-UP&RECOMMENDEDSPARES5.1 Thecostofrequiredstart-upandessentialsparesshallbeincludedforthetransformer.Same

shallbeconsideredforevaluation,atthediscretionofthePurchaser.5.2 Biddersshallfurnishalistofrecommendedsparesfor3yearstroublefreeoperation.6.0 SUPERVISIONOFERECTION,TESTING&COMMISSIONING6.1 TheVENDORSshall,ifsodesiredbyPurchaser,undertakesupervisionoferection,testingand

commissioning. Charges as indicated against relevant clause in the price schedule shall beinclusiveofincidentalexpensesatsite,lodging,boarding,localtransportofVendor’sengineer.



Vendor’sshallalso indicatetoand indicatetoandfroexpensesoftheirpersonnel fromtheirworkstositeonpertripbasis.

7.0 GUARANTEES7.1 TheitemsofperformanceontransformersasstatedinScheduleofPerformanceGuaranteeof

thisspecificationshallbeguaranteedeitherunderpenaltyorundercorrection.Thetolerancelimits beyond which penalty is liveable will be governed as per IS:2026, 1977 (Part-I). Thetemperatureriseguaranteeshallhavezerotoleranceonthepositiveside.

8.0 INFORMATIONTOBEFURNISHEDBYTHEBIDDERALONGWITHBID8.1 Thefollowinginformationshallbefurnishedalongwiththebid.8.2 Allannexure-BasperenclosedformatandScheduleofPricesdulyfilledin.8.3 AllGA,dimensional,weight,foundation,drawingsanddetails.8.4 Qualityplans.8.5 Sub-vendorlistforbought-outitems.9.0 INFORMATIONTOBEFURNISHEDBYTHEVENDORAFTERTHEAWARDOFCONTRACT Informationtobefurnishedafterawardofcontractaspermutuallyagreeddates.a) Positivesequenceimpedanceatmaximumvoltagetap.b) Positivesequenceimpedanceatminimumvoltagetap.c) Zerosequenceimpedanceatprincipaltap.d) Efficiencyat75deg.Cwindingtemperature. At75%fullload At50%fullloade) Maximumefficiencyandloadatwhichitoccurs.f) Regulationatfullloadat75deg.C.Windingtemperatureat: Unitypowerfactor 0.85powerfactorlag.g) Resistanceperphaseof: HVwinding : Ohms MVwinding : Ohms LVwinding : Ohms



h) Shippingdetails: Sizeofthelargespackage(mm) (Lengthxwidthxheight) Weightofthelargestpackage(Tonnes) Totalgrossweighttobehandled(Tonnes) Totalgrossvolumetobehandled(cu.meters)i) Make,typeandsizeofallvalves.j) Make,type,dialsize,numberofcontacts(ifprovided)andcontactratings(currentandvoltage

ratings)forthefollowing: Magneticoillevelgauge. Dialtypethermometer Windingtemperatureindicator(localandremote)k) Gasandactuatedrelay/suddenpressurerelay. Make Type Contacts - Number - Voltagerating - Currentratingl) Conservator Totalvolumeofconservator(litres) Volumesofconservatorbetweenthehighestandlowestlevelsofoil(litres).m) Calculatedtimeconstants. Naturalcoolingn) Thermalwithstandcapabilityunderfullshortcircuitconditions,intermsofnumberoftimesof

occurrenceofshortcircuitcorrespondinganticipatedpercentagereductionintransformerlife.Relevantcalculationsshallbesubmitted.

o) Drawings ThefollowingdrawingsshallbesubmittedforPURCHASERapproval. General outline drawing as submitted at the bidding stage butwith binding dimensions and

weights. Generaloutlinedrawingsshowingplan,frontelevation,andsideelevation,withallfittingsand

accessories,locatingdimensionsofcableentries,earthingterminals,foundations/floorfixingdetails,jackingpadsandweightsofthefollowing.

- Cableboxes



- Disconnectingchambers - Bushings - Plan, elevation, terminal details, mounting details, make and type number, current and

voltagerating,creepagedistanceandprincipalcharacteristics. - Ratinganddiagramplates. - Marshallingboxterminalconnectionswiringdiagram.



DATASHEET-TRANSFORMER1. GENERAL: 1.1 Application/Designation : Distribution Transformer 1.2 Qualityrequired : 2No. 1.3 Installation (Indoor/outdoor) : OUTDoor 1.4 DegreeofprotectionasperIS:2147 : IP–65 2. RATINGS 2.1 Rating : 3500KVA 2.2 NumberofPhase&Frequency : 3PH,50Hz 2.3 Typeofcooling : ONAN 2.4 Noloadvoltage- HV : 11,000V - LV : 433V 2.5 Vectorgroup : Dyn11 2.6 PercentageImpedance : AsperIS:20263. SYSTEMVOLTAGE 3.1 Nominalsystemvoltage - HV : 11,000V - LV : 433V 3.2 Highestsystemvoltage - HV : 12,000V - LV : 457V4. NEUTRALEARTHING 4.1 SYSTEMNEUTRAL a) Effectivelyearthed - HV : -- b) Resonant - c) Non-effectivelyearthed - LV : Effectivelyearthed 4.2 TRANSFORMERNEUTRAL a) Effectivelyearthed - HV : --- b) Resonant - c) Non-effectivelyearthed - LV : Effectivelyearthed d) Isolated - 5. INSULATIONWITHSTAND 5.1 Impulse(1.2/50__wave) - HV : 75KV



5.2 Powerfreq.(Dry&wet) - HV : 28KV - LV : 6. TEMP.RISE 6.1 ReferenceAmbient : 50Deg.C 6.2 OilbyThermometer : 50Deg.C 6.3. WindingbyResistance : 55Deg.C

7. _______________ 7.1 Taps(Onload)required : Yes,OnLoad 7.2 Tappingsonwindings : HV

7.3 Totaltappingrange : +5to-15%instepsof 1.25%7.4 ControlPanelforOLTC :Required

8. BUSHINGS 8.1 VoltageClass a) HVLineEnd : 12KV b) LVLineEnd : 1.1KV c) HVNeutral : --- d) LVNeutral : 1.1 8.2 Impulese1.2/___Wavewithstand a) HVLineEnd : 75KV 8.3 PowerFrequencywithstand a) HVLineEnd : 12KV b) LVLineEnd : 10KV c) HVNeutral : --- d) LVNeutral : 10 8.4 Minimumclearanceinair(inmm) a) HVphasetophase : 127 b) LVphasetophase : 50.8 c) HVphasetoearth : 76 d) LVphasetophase : 50.8 8.5 Minimumcreepagedistance(inmm) a) HVLineEnd : 125 b) LVLineEnd : 100 c) HVNeutral : --- d) LVNeutral : 100 8.6 CTDetails : ---9. TERMINALCONNECTIONS

9.1 Cableboxwithdisconnectingchamber :Cablesubjecttoconfirmationby purchaser.



9.2 LVCablebox : Cablesubjecttoconfirmationby purchaser.

Technicaldatasheet(tobefilledbythebidder)

ANNEXURE–B

S.No.Item

Bidder

1.0 Manufacturer 2.0 Transformerapplication/designation 3.0 Quantityrequired 4.0 Fullloadrating 5.0 Numberofphases 6.0 Ratedno-loadvoltages

a)HVb)LV

KVKV

7.0 Typeofcooling 8.0 Ratedpercentageimpedance % 9.0 Ratedfrequency 10.0 Installation Indoor/

Outdoor

11.0 Windingconnectionsa)HVb)LVc)Vectorgroup

12.0 Highest system voltages for whichtransformerwindingsaresuitablea)HVb)LV

KVKV

13.0 Tappingonwindinga)Onload/offloadtapsb)Totaltappingrangec)Tappingstepsd)OnHV/LVwindings

%

14.0 Maximumtemperatureriseofa)Oilbythermometerb)Windingsbyresistancemethod

0C0C

15.1 Loadlossatratedcurrentat750Cwindingtemperature (guaranteed, subject to +toleranceasperapplicablestandard)

KW

15.2 No-load losses (core loss and dielectric



loss) at 100% rated voltage andfrequency, subject to + tolerance as perapplicablestandard.

KW

16.0 Magnetization current at rated voltageand frequency in percent of full loadcurrent

%

17.017.117.217.317.417.5

WeightWindingsCoreOilTank,coolers&fittingsTotal(17.1to17.4)

KgKgKgKgKg

18.0 Efficiencyat750Cfullload,U.P.F % 19.019.119.2

MaximumFluxDensityAtratedvoltageAt110%ofratedvoltage

Wb/m2Wb/m2

20.0 Listofroutineteststobecarriedout 21.0 List of other tests which will be carried

outagainstextrapricequotedelsewhere

22.0 Drawing number of the general outlinedrawing enclosed with the bid, showingthe transformer with all the fittings andaccessories in plan, and other relevantdetails.

PREFERREDMAKES:VOLTAMP/KIRLOSKAR/UNIVERSAL/CROMPTON