J...MITSUBISHI ELECTRICCORPORATION,JAPANOPERATION AND MAINTENANCE MANUALOF230/115 kV 44/63 MVA TIE TRANSFORMERAPPROVEDWITHCONDi7IO\\i" IOUT Leil.., No, 5;2;14jCYAi'()!\r,O"j"d: NOv ., .... ,""ON" ""li!-, /" -"275kVIout of insulatingoil) islessthancriteria. RefertoFig.2.I M. Content I :530ppmI:5 20ppmICriteriaof OLTCoil isshowninTable3.2-a.(4) Power factor(tan a) This property shall be measured in When the measured tan a and/orandresistivity accordancewiththemethod resistivity of oil are not satisfactory(at 80C and 40Hz to describedinJISC2101 orIEC tocriteria, itisrecommended60Hz) Pub.247(at80C). Reclaimingof oil by fuller's earth or(Everyoneor two replacementof oil.years) Eachcriterionisshownin (For reference:Table6and7. tan afor Bushing;Table9)(5) Acidvalue Measure acidvalue andjudge it with 1ncaseof unsatisfactory, itis(Everytwoyears) thecriteriaof Table8. desirable toexchangewithnewoil.-5/22- SSN-91779No. Items Method Action3 Cooling fanmotors (1)Measureinsulationresistanceof If insulationresistanceisfanwitha500Vmegger. less than2M Q, checkabalancing of(Usuallyitismeasuredwith500V loadcurrent of three phase. Incase(Every two years or megger. ) of fan, dry out the interior of fanthe motor.timeof periodical(2)Measureloadcurrent at each Ifit is morethanthe rated current,inspectionat thephase, andcompare themwith checkthreephasebalancingofloadtransformer stopratedcurrent. current.operation)(maxvalue- minvalue)averageisRefer tothetobewithin10 percent.instruction of coolingfanmotor.4 Cooler control cabinet (1)Check theof a If therubber gasketiswornout,andterminal boxand control cabinet and a terminal exchangeitwithanewone.cables. includepower box.feeders coFlnectionsmegger test,etc.(2)Ascertainthetightness of all Tightentheloosebolts.. control wiring connections.(The timeof periodicalinspectionatthe(3)Operateall switches, If any part mal-operates, adjust ortransformer stopannounciators and lamps to exchange themwithnewone.operation)observeproperfunctionsaccordingtoschematicdiagrams.(4)Measureinsulationresistanceof If such defect is found. putcablewith500V megger. insulationtape on it or exchangeitCheck any crack or abrading on withone.cableinsulation.-6/22- SSN-91779Table 3.2-a: Permissiblevalesfor OLTCdiverter oilPermissiblevalueLocationof OLTCBreakdownvoltage Water contentInstalled tolinesideincluding~40kV/2.5mmgap ;;; 30ppmdeltawindingInstalledneutral side~30kV/2.5mmgap ;;; 40ppmNo. Items MethodIAction5 Protectiverelays Insulation resistance and operation test should be checked at the time oftransformerstopoperationofperiodicinspectionor at least onceevery twoyears.(1) Dial typewinding temperatureindicator(2) Dial typeoil temperatureindicator(3) Dial typeoil level gauge(4) Buchholzrelay(5) Self reset typePressurerelief device(6)Conservator shuttervalve for oil leak fromtank(7) OLTCprotectiverelay(OnlyTie transformer)(1)Insulationresistance Measureinsulationresistanceof Whentheinsulationresistanceislessprotectiverelaysincluding their than2M Q, checkdews inthewiring witha500VTT)egger. terminal box.(2) Operationcheckor Operationtests shouldbe made only The cause of mal:-operation shouldcontactcheck whenprotectiverelaysoperatedeven beinvestigatedbyoperationtestsif notroublesof a transformer according to instruction books foroccurred. protectiverelays.6 Corrosioncheckon Check and record the condition of Inorder toprevent aseriouscoolersand corrosiononcoolers. corrosion, repaintingshall bemadeatconnections Theappearanceofatransformer leastonceeveryfiveyears.shouldbeinspected toseewhether Any connection that shows signs of( At thetimeof theyareingoodconditionswithout havingbeenhot shouldbethoroughlyperiodical inspection) anydiscoloration, whichindicates cleanedandboltedtogethertightly."hot" connection.-7/22- SSN-917793.3 Additional inspectionThefollowinginspectionsandmeasurementsarerecommendedforapreventivemaintenanceandininvestigatingatransformer trouble.Forpreventivemaintenance, followingitem1 and2arerecommended.For investigationat a timeof transformer trouble, all itemsarerecommended.Table3No.123ItemsInsulatingoilAnalysis of dissolvedgasinoil.InsulationresistanceoftransformerwindingsRatio testMethodAfter a transformerisput intoservice, aperiodicanalysisofgasdissolvedinoil isrecommendedatleasteverysixmonths.Usinganappropriateair tightcontainer, oil should be taken fromthetransformer.Thedissolvedgasshouldbeextracted fromanoil andanalyzed.Measuretheinsulationresistancebetweenapair of windings,andbetweeneachwindingsandgroundbya1,000or2,000voltmegger attheperiodical inspection.The megger test should be made tocheckif thetransformeris insuitableconditionfor operation orapplicationof thedielectrictest.Refer toFig.1 .Measuretheratioofatransformerbytwovoltmeter meth adorwitha ratiotester.Ifthetransformer has taps, the turnratioshouldbe measuredfor all tapsas well as for the full winding. Thetestvoltagemaybebetween100and200 at theratedfrequency.-8 / 2 2 ~ActionorremarksWhet) theamountof combustiblegasesareobtained, evaluationscanbemade toaprobablelocationand type of trouble which may bepresentinatransformer.(Refer toTable10)The insulation resistance is subjecttowidevariationwithtemperature,humidity and cleanness of bushingporcelains.It maybelow duetotheleakagecurrent throughtheweakest point ofinferior insulation, in which casegases dissolved in oil should beanalyzed.Compare thetest results with thoseinthe test report.If it isdifficult tomeasurebecauseoffluctuation of voltmeter pointer orbecause of unbalance of a bridgecircuit, other electric characteristicsuch as winding resistance shall bemeasured.SSN-91779No.456ItemsWindingresistanceExcitation currentlowvoltageImpedancevoltageMethodMeasure the winding resistance bybridgemethodorbydropof potentialmethod. If oil pumpsareprovided,theyshouldbeoperatedinmeasuringwinding resistance. Theoil tempera-ture should be also recorded at thesametime.Incaseof lowvoltageandlargecapacitydelta winding(Ex. generatortransformer), thereisaverydifficultytomeasure thewindingresistanceprecisely.Andneedstopaycareful for judgement.at Measure theexcitationcurrentatlow. voltage(100-200volts)appliedonthelower voltagewindingwithotherwindingbeingopen-circuited.Thevoltagewaveshapeshouldbesinusoidal.Note1.1Measure the impedance voltage atlow current(5 - 10 amperes) appliedon the higher voltage winding withlowervoltagewindingbeingshort-circuited.Note2Actionor remarks[f the winding resistance, correctedto a specified temperature, isdifferent from the data obtainedpreviously, measure exciting currentinorder tocheck thedifference.[fthe measuredexcitation current ismuchlarger thantheoriginal dataatinstallation, measureimpedancevoltageinorder tocheck thecause.Note 1.2If themeasuredimpedancevoltageismuchdifferent fromthe original dataat installation. check again andincludeother characteristics.Note37 BushingcurrentTransformerExcitationcurrentandwinding Same asabove4and5.resistanceshouldbemeasuredinthesamewayasitems4and5.-9/22- SSN-91779Note: 1. Excitationcurrent atlowvoltage1.1Theammeter shouldbeconnectedinside of voltmeteras shownbelowtoavoiderrorduetohighImpedancemeasurement.ConnectionTRFig.Cl)1.2 If themeasuredvaluessatisfy theexpressionbelow, thetransformermaynothaveaseriousInjury suchaslayer shortingSeeFig.CllVM/IMVR/[R;;;; 10Measured voltageRated voltageMeasured currentRated cu rrentNote: 2. Theshorting cableshouldbemore than100mm' initssectionandbeasshorteraspossibleinitslengthtoavoidmeasuringerror.Cableconnectionr------{ATRNote: 3. If thosecharacteristicvalues fromtheitem 2 to6areabnormallydifferent compared the datawithoriginal data. itisrecommendedtocarryoutainternal inspection. Inthiscase, youarekindlyrequest totell usknow theinformationasappendix II.-10/22- SSN-917794. MAINTENANCEMaintenanceof partsandmaterials shouldbeplanned according tothetable4.Table4No. MaterialsandpartsBushing:Test tapof bushingMaintenancefrequencyThefrequencyofmaintenanceisonlywhen the lid(cap) of test tap isopened for measuringand/oranyinvestigations..RemarksWhenatest tapof bushingisused,becareful not todamage a screwpart of a bushing test tap. Thetest tap capshouldbemadecertainlyafterusing..Damaged screw part photodue to insufficient tightnessof screw2345678Porcelaininsulatorsuchasbushing,surgearrester,supporting insulatorCooler(Radiator type)Paint formainbodyandconnectionsBearing of cooling fanmotorsProtectiverelays( thermometer,pressurerelay,oil level gauge)Gasket forconnection( cork& neoprene)RubberbagofConservatorCleaning shouldbedoneperiodically.Interval dependsonactualcircumstanceconditionatsite.Dust andother foreignmaterials,accumulatedonthefinnedareashould be blown out to maintain theefficiencyof thecooler.Repaintingshouldbedoneonceeveryfiveyears.Expectedlifeof cooling fanmotors ofthesealedtypebearingisapprox. 3years.In this case, grease up work is notrequired.Each expected life is approx. tenyears.Check the contact operation at theperiodical inspectionincludinginsulationresistance.Expectedlifeisapprox. tenyears.Expectedlifeis 15years.-11 /22-According toeachinstructionbook.Withcompressedair and/orwater.Recommended cleaning frequency isonceeverytwoyears.Aftercleaning thepaintedsurface.Cleaning shall be made with solventforremoval of fat.If a motor becomes noisy due todeterioration of bearings, replace itwithnewones.Replacement of this bearingshall bemade according to the instructionbookExchangewithnewones, if thecontact isnotoperatedinnormalfunctions.If oil leaks fromgasket are serious,exchange with newones at the timeof inspection.Ifanydamageof rubberbagissuspected, exchangewithnew one.SSN-91779No. Materialsandparts Maintenancefrequency Remarks9 De-energized tap Operate theDTCpositionmanually [nternal inspection is recommendableChangermore than threeboth-waychangesbefore DTCcontact operation. if the(ForMaintransformer)everyseveral yearswhentransformertap position is not operated moreisout of service.than3years.Experienceshows thatupto25switchingoperations oneachcontactis necessaryfor removingtarnish onthecontacts.10 On-load tap Lifting inspectionof thediverter Eachinspectionitemshall bedone intapchanger( OLTC) insert shall beplannedby the accordancewith theappliedOLTC(ForTie transformer) operationnumber andpassing years instructionbook.inaccordancewiththeOLTCinstructionbookwhen thetransformer isout of service.-12/22- SSN-917795. TROUBLE SHOOTING1). Diagnosisof protectiverelaysinoperationIf anyprotectiverelaygivesanalarm, investigate its causesinaccordancewiththefollowingtable.Table5No.2345RelayPressurereliefdeviceBuchholzrelayDial typeOiltemperatureindicatorWinding temperaturemonitorOil level gauge(Dialtype)FunctionThispressurerelief deviceis toprotect the transformerincaseifinternal fault or short circuit wereoccurredinthetransformer.Thefirst stageofthisrelaydetectsthe gas formation due to minortroubleintransformer.The second stage detects rushingoil duetoserioustrouble.The dial type thermometer indicatesthe top oil temperature and highestoil temperatureexperienced.Itgivesanalarmwhenoiltemperature getsto thealarmsetting(BOC for example).Thewinding temperatureindicatordetectsindicatesmaximumwindingtemperatureofatransformer.It alsohas protectivefunctionstogiveanalarm, andautomaticfunctions tocontrol cooling system.Dial type oil level gauge indicatestheoil level inaconservatorofanoil-immersedtransformer.Whentheoil level comesdowntothebottomof a conservator, its pointerindicateszeroandgiveanalarm.-13/22-Probablecause1. Transformerinternal fault.Faultcanbeconfirmedbygasanalysisinoil.2. Mal-operationof its owndefectsduetodeterioration.3. Pressureriseduetochoking offilterindehydrating breather.Check the filter whether it ischoking ornoL1) Transformer internal faultIf any gases areaccumulatedintherelay, stopoperationoftransformer immediately andcarryout of analysis ofaccumulatedgasanddissolvedgas inoil.2) Mal-operationof itsown defectsduetodeterioration.1) Overloading2)Insufficient efficiencyof radiatorunitsduetodust andother foreignmaterials accumulated on thefinnedareaorduetoaheavyscaleinthewater coolingcoils.3)Mal-operationof thermometerorthermal contact duetotheirowndefects.If indicationof thermometerisnotcorrect,checkoil level inthesensor pocket andadjust tocorrect level.1. Shortageofoil2.Abnormallylowambienttemperatureinwinter season.3. Oil leakage4. Deteriorationof itscontactSSN-91779No. Relay Function Probablecause6OLTCprotective An OLTCprotective relay detects 1)Fault of diverter insert.Relay some faultsinadiverter of on-load 2)Fault of wholeOLTC.tap changer. 3)Malfunctionof OLTCprotective(Only Tie transformer) relay due tonormal deterioration.7 Otherrelay This relaydetectsthedifference betweentheinput current andtheoutput1)Differential relay currentofatransformerconvertedbycurrenttransformer. It alsooperatessometimeswiththeinrushcurrentwhena transformerisexcited.2)Over current relay Theserelaysdetect faultsintheel ectrical systemincluding transformer.andground fault relay2. Oil leakage1)Oil leakagefromwelding portiona) TemporaryactionApplyeffectiveadhesivematerialsafter cleaning aoil leak portion.b)Permanent actionTakeactionby weldingrepair.2)Oil leakagefromgasket portionAs for a temporary repair, apply adhesive materials. At time of stop operation of transformer,wronggasketshouldbereplacedwithnewoneasthepermanentaction.-14/22- SSN-91779Fig1. Allowablevalueof transformerinsulationresistance1000It age: SystemvMore tha 66kV~'"500EFrom2 kV to66k..t:0bJ)Fom6.6kV o 22kV ~-5~200"t:'"Good+''"" ..~Lt:1000:;::;Poor'""S'".55020L-__----L -'- ..L-__--' -'-__- - " - ~ _ _ _ ' _ < - -o 10 20 30 40 50 60Transformer oil temperature(OC)Fig2. Relationbetweendielectricstrengthandamountof waterinsulating oil70 60 30 40 50Water-,:arts mllion 1'I ""iltrt (FfM)20 10\~~.......~'\~"-~I'------.oo1020403050-15/22- SSN-91779Table5: MELCOCriteriaof Dielectricstrength(Breakdownvoltage) for Transformeroil( Withsphereelectrodeof 2 5mm gap)No, Transformer voltage Dielectricstrength Judgement Action1. More than 40kV GoodPeriodical measurementEveryoneyear.~230kVAfterreinvestigation, oil2. Lessthan 30kV PrecautionTreatment withfilteringordegassingTable6' MELCOCriteriaof Power factor (tan () at80Cfor TransformeroilNo. Transformer voltage Power factor(%) Judgement Action1. Less than1.0 GoodPeriodicalmeaslJrernentEveryoneyear.230kV~More than3.0 PrecautionExchange tonewoil is2.Recommendable..Remarks: Newoil shall beaddedBTA(Benzotriazole: 30mg/Uinoil.Table7: MELCOCriteriaof Resistivityat 80CforTransformeroilNo. Transformer voltage Resistivity( Q 'cm) Judgement ActionMorethan 5E"Periodical measurement1. GoodEveryoneyear.I--230kVExchangetonewoil is2.Lessthan1E"PrecautionRecommendable.Remarks: Newoil shall beaddedBTA(Benzotriazole : 30mg/Uinoil.Table8: MELCOCriteriaof acidvalueNo. Acidvalue( mgKOH/g) Action1 Less than0.1 Good2 Over 0.3Filteringor exchange inearlierstagewithnewoil-16/22- SSN-91779Table9: PermissiblevalueofBushing tan6" appliedoiHmpregnatedpaper type(Refer toIEC137)No. Bushing Insulation tan6" (%) Judgement Action1 ;;;O. 7 GoodPeriodical measuremeptevery1-2years.-Oil-impregnatedpaperAfterreinvestigation,2>1.a Precaution exchange tonewbushing isrecommendable.Table10-1: Combustiblegasand typeof fault withdissolvedgas analysisof insulatingoilNo. Decomposedgases Typeof fault1 H,. CH4 Q.,tl4.C,H,. !;btl,. C3H, Local heatingin theoil2CO. CO,. H,. CH,. Q.,tl4. C,H,. Local heating in the oil impregnated solid-!;btl,. C3H, insulaticm...3 Ji,. CH4. Q.,Ji,. C,H,. C3H, Dischargein theoil..4 CO. CO,. Ji,. CH4. Q.,Ji,. C,H,. C3H, Dischargein theoil impregnatedsolidinsulation.5 CO. CO,. C,H,. C3H, Degradation of insulationmaterialsNote: Underlinemeansasignificantgas.Table10-2: Maintenancelevel for important gases ondissolvedgasanalysisinoilNo. Nameof gases MaintenancelevelH2(Hydrogen) Lessthan400ppmC2H2(Acetylene) Less than0.5ppmC2H4(Ethylene) Less than100ppmCO(Carbonmonoxide) It should be evaluate by necessary and sufficient conditions at thesametimeasbelow.That isbothCO3-17/22- SSN-91779APPENDIX I ActionforsafetyandqualityNo. working condition Actionfor safety1 Exterior check (1) Becarefulnot theapproachliveparts.2 Exterior testand (1) De-energize theconcernedtransformerbycircuit breakersandremedial work lineswitches.(2) Groundthelineterminal of the transformer.(3)Attachcautiontagsnot tooperateswitchesfor circuitbreakersandlineswitch es.Seenote.(4)De-energize thecontrol cabinetsfor coolersand tapchangerbyACandDCswitches.(5)Attachcautiontagsonswitchboxes.3 Whenaninternal Sameas aboveexcept thefollowingadditional items.inspectionistobe (1) Replace nitrogen gas completely with dry fresh air, if it wasmade filledin the transformer forsafetywork.(2) Makesure thereis 18% or moreoxygen tosustainlifeinatransformertank.(3) Makesure your pocketsareempty toavoidentering anyforeignmaterial intothetransformer.(4)Takeoff awristwatchandaccessoriesonyour body.(5) Listupnameandquantityof all toolstobebrought intoa transformer tank.(6)Spreadout cleanclothoncoil groupswhenrepairing.(7) Protectlampswithguardsnot tobreak theminatank.(8) Becareful not todropanytool andforeignmaterial intoatransformer. Secureall toolswithhandlines.Any metallicitemdroppedinto atransformer must be removedtoprevent serioustroubleinfuture.4 Confirmation before (1) Makesureall foreignmaterialsareclear beforeclosingmanholeenergization andenergizing.(2) Check thequantityofall toolsbrought outfromatank.(3) Removethegrounding wiresontheline terminals of thetransformer.Note When testandremedial workmustbecarriedout under theliveconditionsforanySpecial reasons, payattentiontolivepartstoprotectyourself againstelectricalshock.-18/22- SSN-91779APPENDIX II Technical informationtobesent to themanufacturerWheneveryouneed technical adviceforanytroubleof partsandlora transformer itself fromMitsubishi ElectricCorporation, youarekindlyrequested tolet usknow thefollowingtechnicalInformation.1 Nameof powerstationorsubstationwherethetransformer isinservice.2 Serial numberandratingsof thetransformerintrouble.3 Name, typeandserial numberof thepartsintrouble.4 Detailedexplanationincaseof severe troublesa. Durationandamperesofove,r current.b. Over voltageandlor surgeappliedon thetransformer.c. Protectiverelaysinoperation.d. Loadcondition(voltage, current andpower factor)e. Copies of PISor SiSlayout drawings which showlocation ofthetransformerand otherelectrical equipmentsuchas circuit-breakers, lightningarresters andlineswitches.f. Copiesof skeletonsequencedrawings forcontrol panels.When a transformer is suspected transformer internal fault, we recommend5dissolvedgasanalysisassoonaspossible.6 Anyother informationavailableabout thetroubleYourquickanddetailedinformationarebeing expected, whichwouldresult inquickandmoreappropriateactionsforitsrecovery.-19122- SSN-91779APPENDIX ill1. Locationof theleakWelding Method for oil leakr-!.. ,. . . , . . , ~I>/'-~~2. Repairingmethod(1) Preparation(1-1)Takeoff thepaint completelyfromtheweldedportionof theoil leak withwirebrush,portablegrinder or emery clothetc.(1-2) Confirmthepointof oil leak.If the point of oil leak is too small for normal visual check, use the penetrantdeveloping liquidtohelp todetect thepoint.(2) Welding(/22) Weldaround theleak pointasshown inFig-2.(2-2) The weldingelectrode is recommend touse the followingtype*JISD 5016 JIS : JapaneseIndustrial StandardMitsubishi'srecomendingbrand : LBM-52( KobeSteelCo. )*AWSE 7016 AWS: AmericanWeldingStandard(3) Checking(3-1) Take off the slugs and spatters completely fromthe welded portion with brush,portablegrinder or emery clothetc.(3-2) Spraythepenetrant developing liquidtothe repairedportion let for 12 hours andconfirmthat thereisno oil leak.(4) Painting(4-1)Cleanthe weldedportionagain.(4-2) Paint theanticorrosivepaintone layer.(4-3) After 12 hours fromundercoating, paint the finishcoat paint.-20/22- SSN-91779KJHGoc16lid lEI I IDUH INE FORTIE TRANSFORMER15'''SYI92150TITlEMITSUBISHIELECTRICOl it COHPERTMENT PROJECT FILE NO 8K-502G-300K.l s.IPRlllTloup. OIST.r-=-;;-;;;-;",",,;o;-;-;e;;,--;=c=---1-SOCIALIST REPUBLIC OF VIET NAMELECTRICITY OF YHT HAMHYDROPOWER PROHn MANAGEMENT UNIT NO.5BlION KUDP HYDROPOWER PROJECTLOT N21V it SELECTOR14I131:4U II.Ua/1gfflll m6-IO-!3S.lllmllI :oloup -IFI3Iol I IH!TSUBI5HI ELECTRIC CORPORATIOHiii iii 9; -$--aS.hmiDIN.lN .II: aEn F.Millli/1/1RMSFOOIiER COILCOMPARTMENT IlISlDE TAI;K46 AIRRELEASE PLLGFOR RADIATOR 1SETIS2 1W>.NHOLE FOROlTC 348 OIL filmUNIT FOR OLTC 351 IRES [STANCE ELEMENT FORREMlTEOILTEMPERATURE [ punOOATO'CI 144 CONNECTINGVAlVE [BUCflHl)LZRELAY CONSER.I SIZE50 I45 CONNECTINGVAl..VE lBUCHHOLZRELAY -GIIS COLLECTORJ SIZE IS (47 OILDRAINPLIJ3 FOR RADIATOR 1SET27 HA!IDHDl.E 1 SET29 00. ITAPCHAAGER- 00. I SIZE50 1If! llElfYllRATlIIGFILTERBflEATHER FOR TAP CHANGER 128 CONNECTINGVALVE lTIlANSF. I SIZE50 I25 LIFTINGLoo aJACKINGBOSS 426 HAllLABEEYE 420 IWHATORVALVE 1 SET23 FLANI>EO'IIHEELWlTHFOUNOATlONBOLT SR21071 422 EAATHIIIBTEllMIIW.224 RATINGPLATE SV1927B 121 COOLINGFAN 4 SETS16 WHlDINGTEMPERATURE INDICATOR 119 RIlDIATOR 1 SET17 DEHVDflATJIlGFILTERBREATHER FOR lW>JlSFOJIMER 1... 50 I RESISTANCE ElEMENT FORREMlTEWINDINGTEMPERATURE {PtlllIlOATtrc I 137 OILSAMPLlNGVAlVEWITHPUll ffilANSF. TANKl SIZEIS 14 TVBUSHING TYPE' PO' t2HV-1600AJ SR21075 330 Al!TlJKl;T!CStUTTERVAlVE 50 1E32 00. [CONSER. FORTlWI5. 1 SIZE50 135 OILDRAINVALVE [CONSER. FOR TRANSF.1 SIZE25 114 DIAl TYPEOIL GAUGE FORTN' CHAIIGER 18-00027 1a PROTECTIVE RELAYFOR III Ie 343 VAO.AIMVAlVE FOIl TRANs. SIZE50 142 GAS COLLECTOR FOR BUCHHOLZ RELAY 134 OILOlm.ET VAlVE FOROIL FIlTERUNIT SIZE25 3H OILS*lPLINGVAlVEWIn! PUX; lCOflSER, FOR TANIO SIZE 15 16 ON lllADTAP CHo\NGER rTYPE M11MS Il 37 "OTOll DRIVE UNIT 133 00. lCONSER. FOR TAP CHANGERl SIZE25 13B OILIIIlETVALVE FOROll FILTERlINIT sm25 3 F

40 OIL DRAINVAlVE IOLTe O'1PAAiMENTl SIZE50 115 OILTBiPEAATURE INOll:ATOR 136 00. lTRANSF. TAM----(welded) __Main bodyTeflon gaskettt Cap nut.'-'.'-'.'.' "

Stainless flexible tube"OUTLINE DRAWING".Fig-N2 Detail of flexible tubeConnection flangei Note; Thebreather should be removed whenI pressurizing to the OLTC and main body.(2)Connect the conservators and the top of the filter breatherwith the flexible tube along the supports and according toFig-N1, N2, N3 and N4.l.Filter breather for OLTC or main tank and flexible tube between the conservator and filter breather.(Filter breather is called as Dehydrating filter breather or Silica-gel breather)(1) Mount the fIlter breather for the OLTC or main body andthe filter breather on the positions according to theFig-N3(3)Connect the flexible tube and filter breatherwith the gasket and bolts.(4)Insert the silica-gel to the filter breather for the OLTCand main body..(5) Remove the oil pot from the filter breather of the OLTCand main tank and after inserting the silicon oil,re-attach the oil pot to the filter breather.OilpotFig-N1FilterbreatherInlet ofsilica-gelr-::----_Flexiblerl---'----'---h tube

SiliconoilMainbodyFlexibletube,Support(welded)TubesupportBolt&nut Fig-N4281412. Dial type temperature indicator for oil and windingBoltSupport(welded)(l)Mount the temperature indicator on the positionTubeaccording to the "OUTLINE DRAWING". support(2) Lay the conduit and conduit protectoralong the supports temporarily.(The supports are attached by welding in thefactory.)(3) Fix theconduit and conduit protector on allof the supports using the cushions, tubesupports and bolts as shown in Fig-N5.,CapillarytubeFig-N5.Note; Conduit and conduit protector should not be bent less than the radius of lOOmm.Conduit and conduit protectorIndicationcompartmentRadius :More thanlOOmmSensor~ II I\...JWireooFig-N6 Temperature indicator(4)Mount the sensor port on the mounting position. (Some sensor ports were mounted in the factory.Refer to Fig-N7.)[OIL TEMP. INDICATOR] [WINDING TEMP. INDICATOR]Conduit andconduitprotectorGasketIDillevel(3ccJMTD)Sensorasket GasketSensor portSensorConduit and__conduitprotectorSensorportDillevel(llOccIMTH)Fig-N7 Sensor and sensor port(5) Pour the insulating oil into sensor port. (See Fig-N7.) And fix the sensor on the position.291413 Resistance element for oil and winding temperature.(1) Mount the sensor port on the position with the gasket and tightening nut according to the"OUTLINE DRAWING" and Fig-N8. (Some sensor ports were mounted in the factory.)(2) Pourtheinsulating oil intosensor port. (SeeFig-N8.) Andfixtheresistanceelement on theposition with the gasket.[ FOR WINDING TEMP. ]Sensor[ FOR OIL TEMP. ]ResistantelementGasketSeIlsor/portr--=ol Tightening nutfor sensor port GasketFig-N8 Sensor and sensor port(3)Mount the resist/lilt element for the winding temperature according to the "OUTLINEDRAWING" and Fig-N8. (This type resistance element is unnecessary insulating oil.)

!Note:Don't apply more than 10 rnA of electric current to the resistance element because this ;I resistance element is used very thin wire for sensor. I1._._._--.-._._._._--.-.-._._._-_._._._._---_.-._._._.-._._._._._._._._._" /.'I,IIII'\..IrrIIrI r'1r,Gas collection box fFlangerrr-n.._Joint4Attaching &assembling the gas collection box for Buchholz relay..(l)Mounting the gas collection box for Buchholz relay(2)Connecting thecopper pipe between Buchholz relay and gas collection box.Copper pipeFig-N9 Gas collection box and connecting pipe30/41Common base beam::f:I: : ~ : : I ~!Grounding pad- _ ~ IGrounding wire5.Connection of grounding wire.(l)Adjust the grounding wire to the grounding padattached the main tank(2)Cut the grounding wire about lOmm longer than thetop of the grounding wire.(3)Clamp the grounding wire with the grounding pad and bolts. .Bolt & spnngFig-NIO Grounding wire31/4114. Wiring ofproteetive circuit.I Preparation(I)Mount the cooler control cabinet on the position with cushions and bolts after mounting thesupports.(2)See the following drawings supplied by MELCO separately. (j)AUX. CIRCUIT WIRINGDIAGRAM (SVI9279) (2)WIRING SCKETCH(SV20072) ITEMLIST(SW36389)(3)Confirm the quantity and quality of all the parts referring the ITEM LIST.2 Cutting and laying the cable(I)As all of the cables are guided with the supports from the cooler control cabinet to the eachcooling and protective devices, measure the length of the wire for the each devices on the main body.(2)Cut the cables about one(l) meter longer than the measured length after confirming the detailsaccording to the drawings. And attach the cable mark as shown in Fig-PI.(3)F'ix all of the cable ends to the cabinet using the Cable glandaccording to the drawings.Fig-PI(4)Lay the cables from the cabinet side to the each devices (ex. BCT, cooling fan, oil temp. indicator,oil level gauge etc.) side along the cable supports. And fix the cables to the cable supporters usingbinder.3 Wiring(I)Treat the cabinet side end of the cable according to following procedure. See Fig-P2.(j)Cut only the Protector of the Cable as shown in Fig-P2 and fix the cable to the cabinet withCable grand(Cable connector).Attachment of a grounding wire is only a cable for PT. [Ie"". ,",,'Protector''''' ?\,;,,_'H Taping of this range by adhesive tapeFig-P232141confirming the cable marks, Connect all of the wires to the terminals in the cabinet afterattaching the crimp terminals in accordance with the drawings.@ Wires should be fixed and bound as nice looking.(2)Treat the device side end of the cable according to following procedure. (See Fig-P3.)CDAfter adjusting the cable length, Cut only the Protector and metal sheath of the cable as shownin Fig-P3.Fig-P3 the protector, inner protector and wire with adhesive tape as shown in Fig-P3.@After confirming the wire using multi tester or buzzer in accordance with the drawings, Connectthe wires to the terminals of the device with the crimp terminals.4. InspectionNOTE: CDResistantelementshould notbesent anelectric current because it isusedverythin wire. Insulation resistance: more than 10 M Q(I)After finishing the connection of all of the wires, Confirm that all of the wire connections arecorrect using multi tester or buzzer.(2)Measure and confirm the insulation resistance of all wires including the devices by 500Vmegger3314115.0illeakage test.1 Carry out the oil leakage test in accordance with following procedure; (See Fig-Q1.)(1) Fill the main body with the oil till level "2" of the conservator of the main body after opening V4.Pressureregulator24V17Nitrogegas cylinderCompoundgaugeV5liter breatherpipe for main bodyFig-Q1VB(Rubber bag)V2:::::-::::::::::;::::::::::::-:::::::.:..8:::;:::::;::-::;::::::.Conservatorfor main bodyConservatorforOLTCOil level~ y p a s s H o s e(Transparent vinyl hose)y1Filter breatherpipe for OLTC(2) Remove the filter breather from the filter breather pipe for main body. And attach thevalveV17, 22, 23 and V24. (V17, 22, 23 and V24 is used for installation work only.)(3) Arrange the nitrogen gas cylinder, pressure regulator, compound gauge and the hoses.(4) Apply pressure to the main body at 0.01-0.02MPa (0.1-0.2 kg/cm2) with the nitrogen gas andrelease the air from the conservator through the V4 till the oil is discharged from the V4.oValve situations : Opened valve--+V2,V4,Y17, V22, V23 and V24.Closed valve --+V5,V6.NOTE: Attend watchmen by the compound gauge and the V4 because the injection speedof the nitrogen gas should be controlled by the pressure of the compound gauge.And the V4 should be closed immediately when the oil is discharged.Main bodyPressure reliefdeviceAnd then put all of the oil out from the main body.(5)After removing the hose from the nitrogen gas cylinder and opening the V24, fill again the mainbody with the oil till the oil level is "6".(6)Apply pressure to the main body at 0.05MPa(0.5kg/cm2) with the nitrogen gas and after closingthe V24, jot down the pressure and the oil temperature. And sit the main body this condition for24Hours.(7) Check the transformer for air leaks withsoapy water and oil leaks after 24hours fromthe time when the pressure was applied.. Gasket2 Mount the pressure relief devices on the positions as followings. (See Fig-Q2.)(1) Mount the pressure relief device on the position with the gasket.NOTE; Don't put the foreign materials into the main body.Fig-Q2(2)Mount the cover and the pressure relief vent.3414116.Final oil filling under vacuum.1. Carry out the final oil filling according to following procedure; (See Fig-R1.)(1) Arrange the oil purifier, oil storage tank, vacuum pump, vacuum gauge, pipe adapter, oil hoses,vinyl hoses and valves(Vll - V20 are valves for only installation) as shown in Fig-R1.)NOTE: It should be used that the vacuum hoses should be as short and large in diameteras possible.VI5Pressure regulator\Nitrogengas cylinderVI4(Oil storage tank)VIOilhose1Vacuum gauge(Compound gauge)'HoseVI6 (Vacuumpump)(Oil purifier)Oil level gauge for conservator(Temporally)V2(Maio body)V2I=:Bypass hose.5""1Fig-R1(2)Check the "VACUUM OIL" of the vacuum pumps for the vacuum pump set and oil purifier.(DVacuum oil level of the vacuum pump.No water in the vacuum oil.(3)After confirming the following valve situations, pull vacuum the main body till following criteria.Valve situationsCriteriaOpened valve V1,V6,V7,V8,V16,V17,V18,V19,V20,v21.Closed valve V2, V3,v4, V5, Vll,v12,V13,V14,V15.Vacuum degree Less than 1.0 Torr.(133Pa)Vacuum hold time More than 4.0 Hours(4) After closing the V16, VB and V19, carry out the vacuum leakage test for 30 minutes and confirmthe result is satisfactory the criterion. Again pull vacuum after finishing the vacuum leakage test.Criterion: V(Leakage value) ...... Less than 19kPaL!min(140 LTorrlMin.)V =(Pz - Pl)/30 X VlPl : Vacuum degree at 5 minutes later from the valves closing (Torr.)Pz: Vacuum degree at 30 minutes later from the Pl measured time (Torr.)Vl : Oil volume of main body (Litters)35141(5) Confirm the breakdown voltage of oil is more than 50 kV/2.5mm Gap. This testing oil sampleshould be taken from the outlet of the oil purifier.mg: more t . mm ap.In case of that the breakdown voltage of oil is not satisfactory, circulate the oil till thecriterion is satisfactory.MainbodyVIFwdirection(OilVII purifier) V12 V13VI4(Oil storagetank)VI5VI5 should beopened duringcirculation.Fig-R2Oil level'Fi' j.JJbody top~w.7,Main~Closed valveCriteria:Vacuum degree ->Less than 1.0 Torr.Oil temperature ->40 - 60C(Oil purifier outlet)(6)After confirming the breakdown voltage of oil, fill the main body with the oil through the VI tillthe temporary oil level under vacuum. (Temporary oil level is 300mm up the main body top asshown in Fig-R3.) Bushing turretValve situations (See Fig-Rl.) \Opened valve ->VI, V6, V7, V8,Vll, V12, V13, VIS,V16, V17.V18, V19 V20, V21.->V2, V3,V4, V5.Fig-R3(7)After closing the V16, stop the vacuum pump. And after closing the V18, replace the vacuumgauge to the compound gauge and again open the V18.(See Fig-RI.)(8) Fill the main body with the oil again till the pressure of the compound gauge hecomeso-0.005MPa (0 - 0.05 kg/cm2)(9)Close the V8 and V19. And open the V2.(lO)After closing the V6 and opening the V4, fill the conservator with the oil till level "2" of the mainbody conservator.(See Fig-Rl.)*Itchecksthattemporallyoil level gaugeanddial oil level gaugeareseensimultaneouslyandthere are no abnormalities in dial oil level gauge.Valve situations(See Fig-R1.) ;Opened valve ->V4, V2, VI, Vll, V12, V13, VIS, V17.Closed valve ->V6, V3, V5, V7,V8, V14,V16, V18, V19, V20.Criteria; Oil temperature ->40 - 60C(Oil purifier outlet)(ll)Replace thecompound gauge fromthe V18 to the filter breather pipe of theconservator. (FromFig-RI to Fig-R4.)(12)Arrange the nitrogen gas cylinder, pressure regulator, compound gauge and the hoses as shownin Fig-R4.36/41Pressureregulator(13)Apply pressure to the main body at 0.01 - 0.02MPa (0.1-0.2 kg/cm2) with the nitrogen gas andrelease the air from the conservator through the V4 till the oil is discharged from the V4(Fig-R4 shows the oil level situation after finishing this procedure.)Filter breatherpipe for main bodyV23Nitrogengas cylinderV2OilConservatorfor main bodyConservatorforOLTC..."J1Fig-R4r'-'-'-'-'-'-'-----'---'---'-'---'-----'---'-'-----'--,_NOTE: Attend watchmen by thecompound gauge and the V4 because the injection speed of the .! nitrogengas shouldbecontrolledby thepressureof thecompoundgaugeandtheV4 ~~ should be closed immediately when the oil is discharged_ . I~ . _ . _ . _ . _ . _ . _ ~ . - . _ . _ ~ ~ . _ . _ . _ . _ . _ . _ . _ . _ . _ . _ . _ . _ . _ . _ . _ . - . ~Filter breatherpipe for OLTC\ ~(l4)After closing the V24, removing the hose from the nitrogen gas cylinder and opening the V17, fillagain the main body conservator with the oil till the oil level is "6"Valve situations(See Fig-Rl) ;Opened valve ->VI, V2, Vll, V12, V13, V15, V17, V23.Closed valve ->V3, V4, V5,V6, V7,V8, V16, VI8, V19, V20..Criteria: Oil temperature -+40 - 60C(OiI purifier outlet)(15)Remove the valve(V17) and re-attach the filter breather from to the filter breather pipe for mainbody conservator, also OLTC too. (See Fig-Rl.)(16) The final measurement of insulated oil resistance.Measurement of at oil sampling from main body bottom valve.r ' - ' - ' - ' - ' - ' - ' - ' - ' - ' - ' - ' - ' - ' - ' ~i Criteria: More than 50kV/2.5mmGap !. 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