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1、558IEEETRANSACTIONSONPOWERDELIVERY,VOL.16,NO.4,OCTOBER2001Design,SimulationandTestingofanEHVMetal-EnclosedDisconnectorJoseLopez-Roldan,Member,IEEE,TerryIrwin,SteveNurse,ChristopherEbden,andJimHanssonAbstract—Oneofthemostdemandingdesignissuesinthedevel-opmentofmetal-clad
2、disconnectorsforapplicationat500kVandover,istoensuretheswitchingcapabilitiesofthedevice.Thispaperpresentstheissuesandprocessesinvolvedfromtheinitialdesignthroughtofinaltestingofa550kVdisconnector.Theinitialworkconcentratedondefiningthedesignparametersinordertominimizeth
3、eriskofarcbreakout.Computeranalysisusing2Dand3Dmodelingofthecontactconfigurationwascar-riedout.Asafollowingstep,beforebuildingthedisconnector,theresultsofthecomputationswerevalidatedbyastatictestwheretheelectrodearrangementwassetmanuallyatdifferentgapdis-tancesanddischa
4、rgesbetweencontactsweremonitored.FromthecomputationalandtestdataafinalcontactdesignwasoptimizedFig.1.3Danalysisshowingthechangeofelectricfielddistributionwhenaleaderbridgesthecontactgap.andadisconnectorprototypewasbuilt.Finallythecapabilitiesforbus-chargingcurrentswitch
5、ingweretestedinaccordancewiththeIEC1259standard.TheresultsofthesetestsincludemeasurementandcomparisonwithEMTPsim-ulationsofthefasttransientovervoltagesgeneratedbydiscon-nectoroperations.IndexTerms—Disconnector,gas-insulatedsubstation,SF6,VFTovervoltages.I.INTRODUCTIONIS
6、CONNECTORSinmetal-enclosedSF6-GasInsulatedDSwitchgear(GIS)areusedtoswitchsmallcapacitivechargingcurrents.Sincethedisconnectorisan“offloadswitchingdevice,”thespeedoftheoperatingmechanismisusuallyveryslowbycircuitbreakerstandards,anumberofFig.2.Electricfieldanalysisalongt
7、hetravelingdistance.pre-strikesorre-strikescanoccur,eachgeneratingavoltagetransientwhenclosingoropeningthedisconnector(1,2).II.DESIGNAsaresultofthehighdegreeofoccurrenceofsuchaxialdis-Inordertopreventthepossibilityofanarcbreakoutthemainchargesandthefasttransientovervolt
8、agesassociated,aline-to-parametersforthedesignofthedisconnectorcontactsare:groundfaultcanbeexperiencedinthesub
