New 8 Specification of 3311kV 1620MVA TransformerWord格式文档下载.docx
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New 8 Specification of 3311kV 1620MVA TransformerWord格式文档下载.docx
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Atmospherically,MechanicalandChemicalimpurities
Moderatelypolluted
TheinformationisgivensolelyasaguideforTendersandnoresponsibilityforits,accuracywillbeacceptednorwillanyclaimbasedontheabovebeentertained.
Transformersuppliedunderthiscontractwillbeinstalledintropicallocationsthatcanbeconsideredhostiletoitsproperoperation.Particularproblemsthatshallreceivespecialconsiderationrelatetooperationinahotenvironmentandpresenceoftheinsectsandvermin.
7.3SystemParticulars
SL.
no.
SystemCharacteristics
VoltageLevel
1.
NormalSystemVoltage,kV(VoltageClass)
230
132
33
11
3.
MaximumSystemVoltage,kV
245
145
36
12
4.
SystemFrequency,Hz
50
5.
PhaseRotation(Anti-Clockwise)
RST
6.
TypeofSystemGrounding
Solid
7.
RatedFaultLevel(3-PhaseSymmetrical),MVA3sec.
16300
6000
1500
500
8.
BasicInsulationLevel,kV
750
650
170
75
7.4STANDARDS
TheequipmentspecifiedinthisSectionofthecontractshallconformtothelatesteditionoftheappropriateIECspecificationsandotherrecognizedinternationalstandard.Inparticular:
IEC
76-1
Powertransformers(General).
76-2
Powertransformers(TemperatureRise).
76-3
Powertransformers(InsulationLevels,DielectricTestsandExternalClearanceinair).
76-5
Powertransformers(AbilitytoWithstandshortcircuit)
137
Bushingsforalternatingvoltagesabove1kV.
156
Methodofdeterminationofelectricalstrengthofinsulatingoils.
296
Specificationforunusedmineralinsulatingoilsfortransformersandswitchgear.
551
Measurementoftransformerandreactorsoundlevels.
616
Terminalandtappingmarkingsforpowertransformers.
722
Guidetolightningandswitchingimpulsetestingofpowertransformers.
5493
Protectivecoatingofironandsteelstructuresagainstcorrosion.
7.5TechnicalSpecification
RatedMVA(ONAN/ONAF)
16/20MVA
2.
NumberofPhases
3(Three)
Frequency
50Hz
WindingInsulation
Uniform
NormalTransformationRatioatNo-load
33/11KV
RatedHTVoltage(PhasetoPhase)
33KV
MaximumHTVoltage(PhasetoPhase)
36KV
RatedLTVoltage(PhasetoPhase)
11KV
9.
MaximumLTVoltage(PhasetoPhase)
12KV
10.
RatedCurrentHT(ONAN/ONAF)
280/350Amps
11.
RatedCurrentLT(ONAN/ONAF)
840/1050Amps
12.
BasicInsulationLevel:
a)Highvoltagewinding
170KV
b)Lowvoltagewinding
75KV
13.
Installation
Outdoor,Tropical,Highrainfall&
Humidity.
14.
Type
Core,Conservator&
OilImmersed
15.
TypeofWindings
DoubleWoundofElectrolyticCopper,freefrombursandsplinter.
16.
TypeofCooling
ONAN/ONAF
17.
Coolant
MineralOilasperIEC-60296
18.
TypeofSystemEarthing
EffectivelyEarthed
19.
BushingMaterial
Porcelain
20.
TypeofBase
OnWheels
21.
DirectionofNormalPowerFlow
HT-LT
22.
Phaseconnection:
(-)
a)33KVwindingwithbushingCT
Delta
b)11KVwindingwithbushingCT
Star
23.
VectorGroup
Dyn11
24.
Neutraltobebroughtout:
a)HT
Nil
b)LT
Yes
25.
NeutralInsulation
Fullinsulationand100%loadingcapacity
26.
MaximumTemperatureriseover400Cambientatfullload&
tapchangeisatnormalposition:
a)WindingbyResistance(0C)
650C
b)OilbyThermometer(0C)
600C
27.
ImpulseFrontWaveTestVoltage(1.2/50MicroSec.WaveShape):
a)Highvoltageside
170KV
b)LowvoltageSide
75KV
28.
PowerFrequencywithstandTestVoltagefor1(one)Minute:
a)Highvoltageside
70KV
28KV
29.
ImpedanceVoltageat750C,atnormalratioandratedfrequency,andatONANcondition.
8.5%
30.
Typeoftapchangercontrol
Features
Thetapchangerwillbeonloadautoregulation,remotecontrolandmanual.Theonloadtapchangerwillimmersedinthetransformertank.Thediverterswitchcompartmentwillbeprovidedwithitsownoilconservatorwhich,willnotbeconnectedtothetransformeroiltank.
Thediverterswitchcaneasilybeliftedoutofitstankformaintenanceandinspectionwithoutopeningthetransformercover.Theonloadtapchangerwilloperatebymeansofamotordriveunit.Thisunitwillinstallonthesideofthetransformer.
OnLoadTapchangerwithmotordriveunitmanufacturer’sname&
country
MR,Germany/ABB,Sweden
TappingRange:
17Tapping10%instepsof1.25%i.e.33KV8x1.25%
31.
BushingCTfordifferentialprotection
400/5AonHV,1200/2.89AonLVofaccuracyclass5P15,burden15VA.
32.
NeutralBushingCTforStandbyEarthFault(SEF)&
RestrictedEarthFault(REF)protection
400-1200/5/5AonLVneutralofaccuracyclass5P15,burden15VA.
33.
Standard
Design,Manufacture,Testing,InstallationandPerformanceshallbeinaccordancetothelatesteditionsoftherelevantIECstandards.
34.
TransformerOil
Application
InsulatingmineraloilforTransformerItwillbefreefromPCB(polychlorinatedbiphenyl)
Gradeofoil
Class-1
PHYSICALPROPERTIES
Appearance
Liquidandfreefromsuspendedmatterorsediment
Densityat200C
0.895g/cm3(maximum)
Flashpoint(Closedcup)
1400C(minimum)
KinematicsViscosityat-150C
800cSt.(Maximum)
KinematicsViscosityat200C
40cSt.(Maximum)
Pourpoint
-300C(maximum)
ELECTRICALPROPERTIES
DielectricStrengthat50Hz(with2.5mmstandardgapand40mmstandarddepth)
Newuntreatedoil,shallgothroughfiltrationtreatmentbeforetheoilareintroducedintotheapparatusorequipment.Thebreakdownvoltageofthisoilshallbeatleast50KV.
Losstangent/Dielectricdissipationfactorattemp.900C,stress500V/mmto1000v/mmandfrequency40Hzto62Hz.
0.005(maximum)
CHEMICALPROPERTIES
Neutralizationvalue
0.03mgKOH/g(maximum)
Neutralizationvalueafteroxidation
0.40mgKOH/g(maximum)
Totalsludgeafteroxidation
0.10%weight(maximum)
PCBContent
FreefromPCB
STANDARDS
PerformanceandtestingofoilshallcomplywiththelatestrevisionoftherelevantstandardsBS148:
1972,IEC-60296orlatestrevisionthereon.
35.
Features&
AccessoriesofTransformer:
a)BushingInsulatoronHTandLT.
b)ArcinghornsonHTandLTbushings.
c)RemoteTapChangerControl(RTCC)facilityinTransformerHTincomingPCMPanel.
d)Oilconservator.
e)Buchholzrelaysinmainconservateroilpipe.
f)TapChangerProtectiveRelayinbetweenconservativeandtapchangeroilpipe.
g)Conservatordrainvalve,breatherandoillevelgaugewithalarmcontact.
h)PressureReliefDevice(PRD).
i)Dialtypethermometerswithalarmandtripcontracts.
j)CTforwindingtemperatureshallbelocatedatmid-phase(Y-phase)ofthetransformer.
k)Radiators.
l)Oneinspectionholewithcover.
m)Facilitiesforliftingcoverandcoilassemblyfromtank.
n)LiftinglugsforliftingcompleteTransformer.
o)Basedesignedforrollerswithbi-directionalflangedrollersparalleltoeitherCentreline.
p)Tankoilsampling,drainingvalveandoilcentrifugingoutlets.
q)Tankearthingpoints.
r)Fansforforcedcooling(ONAF).
s)Allmountingaccessoriesincludingrails(2Nos.railseach10Meterlong).
t)Allequipmentshouldbefullytropicalized.
u)Paintingtoapprovedcolourandshade.
v)Ratingnameplateanddiagramplateofstainlesssteelhavingengravedlettersfilledwithblackenamelpaint.
w)Theoilshallbesupplied/deliveredinnon-returnablesealedcontainers/drums.
x)Theoilshallbefresh,unused,cleanedandfreefromsuspendedmatterorsediment.
y)Thetestshallbecarriedoutontheoilastobesuppliedwithoutdryinganddegassing.
z)Uninhibitedoilsmustnotcontainanti-oxidantadditives.
aa)Laminated,detailedSchematicDiagramofControlCircuitofTransformer&
Tapchangerinside
Marshallingkiosk.
7.6InformationRequired
TheBidder/Manufactureraspertenderrequirementsshallprovideallinformation.Thefollowinginformation/documentshastobesubmittedalongwiththetenderotherwisethebidwillberejected:
a)TheTenderer/Manufacturershallsubmitthetestingprocedure&
listoftesting/measuringequipment,metersetcforofferedtypedtransformerusedforFactorytestwitness.
b)Construction,Installation,Operation&
MaintenanceManualofoffertypedPowertransformer.
c)Manufacturer’svalidISOCertificate.
7.7Documentation
ThefollowingDrawings,TechnicalDocumentsandInformationshallbesubmittedwiththeofferfortheofferedtype33/11kV,16/20MVAPowerTransformerorhigherMVAratingofsamevoltageclass,otherwisethebidwillberejected:
-
A.Commercial
TenderershallbeeligibleasperITTClauseNo.
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