孟加拉国 50MVA 132kV 电力变压器英文招标书Word格式文档下载.docx

孟加拉国 50MVA 132kV 电力变压器英文招标书Word格式文档下载.docx

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GhorashalPowerStation.

a.132/33/11KV,ONANrating25/25/18MVA,ONAFrating50/50/35MVA,outdoormounting,3phase.50Hz,uniforminsulation.1324x2%KV（HVtapson-loadoperating9Nos.oftaps）,mineraloilimmersedequippedwithBCT.Thesupplyoftransformerwillalsoincludesuitablesize（sizewillbeconfirmedduringdetailEngineering）ofMSrailforplacingoftransformeronfoundation.DuringsubmissionofthebidthetechnicaldatarequirementofBPDBshallbefullycompliedbythebidder.IncaseofanydeviationobservedinbidderstechnicaldatafromUser’stechnicaldata,thebidder’sbidwillbedeclarednon-responsive.Thebidderwillprovide1（one）engineerforexpertserviceduringinstallation,testingandcommissioningofthetransformerfor15days.ThefollowingspecificationarepreparedbasedontheexistingonewithaviewtoprocureanidenticalonebecausebothwillruninParallel.SuccessfulBiddermayvisitGhorasalpowerstationfortakingnecessarydataformexistingoneexternallybymeasurementfordetailengineering.

b.TheinsulationvalueofHV/MV/LVsidesare:

（i）Highestsystemvoltage:

145/36/12kV

（ii）BasicinsulationLevel（BIL）:

650/170/75kV

（iii）Powerfrequencywithstand

Voltage（1min）:

275/70/28kV.

TheInsulationlevelofHV&

MVNeutralBushingshallbesameasPhaseBushings.

c.TheHVbushingandbushingfortheneutralshallbecapacitortype,porcelainbeingbrownglazed.TheBCTfittedintheneckofeachbushingshallhave2core&

4tappingofeachcore.Theratio,accuracyclassandburdenofBCTareasfollows:

HVBCT:

（i）1stcore:

Nooftapping:

4

1sttap:

400/1A,3P20,20VA.

2ndtap:

600/1A,3P30,30VA.

3rdtap:

750/1A,3P30,75VA.

4thtap:

1000/1A,1P30,30VA.

（ii）2ndcore:

4

400/1A,class0.2,20VA.

2ndtap:

600/1A,class0.2,30VA.

750/1A,class0.2,75VA.

1000/1A,class0.2,30VA.

BushingfortheneutralofHVside:

（1）1stcore:

200/5A,10P15,15VA.

300/5A,3P10,10VA.

400/5A,3P20,20VA.

600/5A,3P30,30VA.

（ii）2ndcore:

Sameas1stcore:

d.TheMVbushingandbushingfortheneutralmaybeofcapacitortypeorporcelaintypewithoutsideglazedofbrownporcelain.TheBCTfittedintheneckofeachbushingshallhave2core&

MVBCT:

600/5A,3P30,30VA.

750/5A,3P30,75VA.

1000/5A,1P30,30VA.

Sameas1stcore.

（I）1stcore:

1sttap:

e.TheLVbushingmaybeofcapacitortypeorporcelaintypewithoutsideglazedofbrownporcelain.NoCTrequiredforthebushing.

f.Valuesofresistancereactanceofthetransformershallnotbedeviatedbymorethan2%（twopercent）oftheBPDB’Srequirementsandthecore&

copperlossoftransformershallnotexceed5%（fivepercent）ofBPDB’Srequirements.Theabove-mentionedvaluesarethetolerancevaluestobemaintainedduringfactorytestingifexceedsthetransformerwillberejected.

Theimpedancevoltage,corelossandcopperlossofthetransformershallbe:

ImpedancevoltageatHV-132-kV,MV33,kvat50MVAandat750C:

BetweenHVandMVwinding=11.568%

BetweenHVandLVwinding=19.443%

BetweenMVandLVwinding=6.051%

Corelossatnominalvoltage,normalratioandatratedfrequency=37.914kW.

Totalexcitationcurrent=0.251%

Fullloadcopperlossatnominalvoltage（HV=132kV,MV=33kV）normalratioatratedfrequencyandat750C:

50MVAHVandMVwinding=271.712KW

35MVAHVandLVwinding=170.854KW

35MVAMVandLVwinding=130.092KW

g.Thewindingshallbecapableofwithstanding:

14.3timesbasecurrentfor5seconds.

16.6timesbasecurrentfor4seconds.

20.0timesbasecurrentfor3seconds.

25.0timesbasecurrentfor2seconds.

Thewindingshallbeofelectrolyticcopper,freefrombursandsplinter.Papershallbeusedforconductorinsulation.

h.TheinsulatingoilshallmeetallrequirementsasdefinedbyNEMAstandard/B.S.shallbechemicallystable,freefromacidityandothercorrosiveingredientsandshallposseshighdielectricstrength.Oilforfirstfillingshallbeshippedinnon-returnabledrums.10%ofthequantityrequiredforatransformeristobesuppliedinadditionduetousuallossesduringinstallationcentrifugingetc.

i.Thetransformertankshallbeofweldedconstructionfabricatedfromhightensilesteelplateandshallbedesignedtowithstandfullvacuum.

j.Thetransformershallhaveairsealcelltypeoilconservatortank（theoilsurfaceiscompletelyisolatedfromtheatmospherebyinstallinganoilresistantrubbercellintheinterioroftheconservator）atthetop.Transformerwillbeprovidedwith2separateconservators（1formaintankandanotherforOnloadTapChanger）,whichwillbehavingprovisionformountingseparateMOLG.OneparttobeconnectedwithtransformermaintankthroughBuchholtzRelay（withcocksonbothside）andtheotherpartwithOLTCtankthroughanothergasRelay（withcockeitherside）.Bothwillhaveoillevelindicate（visual）withcontactsformedicating“LOWOILLEVEL”inthecontrolpanel.

k.PressureReleaseDevicesforbothMainTankandOLTCTankshallbeprovided

l.SilicagelBreatherwithglasswindowshallbeprovidedforbothhalvesoftheconservatorlank.

m.TheOn-loadTapChangeroperatingdeviceshallbeequippedwithlocal（manualandelectrical）andremoteelectricaloperatingdevicewithappropriateinterlocking.TheOLTCmotorshallbe3-phase400Voperatingtype.Themechanicalpositionindicationshallbetherebothatthetapchangeraswellasontheoperatingdevice.ContactsArrangementsshallbethereforremotepositionindicator（bydigitaldisplaysystem）ofthetap.Appropriateglandsfortheentryofcontrolcableshallbeprovided.

n.SufficientCoolingFans（3-phase,400V,50HZ）ofadequatecapacityshallbefittedonthebodyofthetransformerforcoolingpurposetoachievetheONAFratingovertheaverageambienttemperatureof400C.ThereshallbeacontroldeviceinweatherproofhousingfittedonthebodyofthetransformerandequippedwithcontrolrelayoperatedbysensingdeviceofoiltemperatureinsidethetransformerandoperaterequisiteNo.offans.Besidethereshallbemanualswitchingdeviceofcoolingfans.

o.TheRadiatorsshallbeinbanks,whichcanbefilledwithorremovedfromthebedsoftransformertank.SufficientradiatorsshallbeprovidedtoachievetheONANratingataverageambienttemperatureof400C.Eachbankofradiatormusthavetwostopvalveoneofwhichshouldbefixedatthetopandtheotheratthebottom.

p.Besidethemaincomponentsofthetransformertheotherfeaturesandaccessoriestobeassociatedwhichareasfollows:

（i）Inspectionholewithcover.

（ii）Manhole.

（iii）Nameplatewithcompletediagramsandmainspeculations.

（iv）Upperandloweroilvalvesoilsamplingvalveanddrainvalve.

（v）Laddertoclimbuptotopwithbarrieratthebottom.

（vi）Thermometerforsendingoilandwindingtemperatureanddisplay:

WTIshallhavetwocontactsamongthemonewillbeusedforalarmcircuitandotherwillbesuitableforintercroppingofHVandMV/LVCircuitBreaker.

（vii）AllHV（132KV）terminalsshallbeprovidedwithappropriateconnectingclampstobeconnectedwith636MCMACSRconductors.TheLV（33KV）terminalsshallhavealsoconnectingclampsappropriateforbeingconnectedwithone636MCMACSRconductor.Theneutralterminalshallhaveconnectingclampstobeconnectedwith2/0HDBSwire.Thesizeofconductorsmaybechangedduringapprovalstage.

（viii）Thereshallbefourwheels（flangetype）suitableformountingonrailsandtocarrythetransformerasawhole.

（ix）Thetransformershallhaveatleasttwogroundingterminalsonitsbody.

AllferrouspartsofthetransformershallbegalvanizedorpaintedwithappropriatepaintsofMUNSELLNO-5Y7/1.Transformerwithmaximumshippingheight（notexceeding11feet）willbepreferred.

q.Onesetofextragasketsandonesetbushingofeachtypeistobesuppliedwiththetransformerlotwithoutextracost.

r.Thelosscapitalizationofpowertransformerwillbedonebythefollowingformulaforevaluation.

C=A+25650XFL.

Where:

C=CapitalizedcostinTaka.

A=QuotedC&

FcostinTake.

FL=TotalconsumptionofcoolingfansinKW.

s.MakeandModelofTapChanger:

ThetransformerwillbefittedwithMR,GermanymakeOnLoadTapChanger（M111500YModel）

t.ColorofFinishPaint:

AlltheexistingtransformersatGhorashalarehavingexternalAluminumfinishPaint,Thesamewillbeprovidedforthenewtransformer.

u.Terminationoftertiary:

Tertiary（11KV）windingwillbebroughtoutsidetotanktopafterclosingdeltawindinginsidethrough3externalbushings.（Bushingswillbesuppliedextra）

v.ControlschemeofTapChanger:

OnLoadTapChangercontrolschemeofnewtransformerwillbesuitableforindividualoperationoftransformerfromControlroom.Master–Follower,Individualoperationfacilitywillbeprovidedinthisunit.

w.Terminalconnector:

Transformerwillbesuppliedwithterminalconnector