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1、1462S.Kanekoetal.:DetectingCharacteristicsofVariousTypeAntennasonPartialDischargeElectromagneticWaveRadiatingthroughInsulatingSpacerDetectingCharacteristicsofVariousTypeAntennasonPartialDischargeElectromagneticWaveRadiatingthroughInsulatingSpacerinGasInsulatedSwitchgearShuheiKaneko,Shigemi
2、tsuOkabeTokyoElectricPowerCompany4-1,Egasaki-cho,Tsurumi-ku,Yokohama,Kanagawa,230-8510,JapanManabuYoshimura,HirotakaMuto,ChiekoNishidaandMitsuhitoKameiMitsubishiElectricCorporation8-1-1,Tsukaguchi-Honmachi,Amagasaki,Hyogo,661-8661,JapanABSTRACTAwidelyused,effectivemethodfordiagnosingtheins
3、ulationofagas-insulatedswitchgear(GIS)istodetectpartialdischargesusingsignalsintheultrahighfrequency(UHF)band.TodetectpartialdischargesignalsthatpropagateinsideaGIS,itisnecessarytoinstallasensorinsideorsetontheoutsideofaGIStank.ForGISsthathavealreadybeenconstructed,itiseffectivetouseextern
4、aldiagnosisusingelectromagneticwave(EM-wave)signalsthatradiate(leak)fromtheinsulationspaceroftheGIStank,andthereisstrongdemandforsuchadiagnosistechnology.ExternallyleakingEM-wavesareoftendetectedusinganantenna,andmultipleantennassupportingdifferentfrequencybandsarecommerciallyavailable.The
5、accuracyofexternaldiagnosiscouldbeimprovedbycomparingandevaluatingthecharacteristicsofvariousantennas.TheinsulationspacerofaGIStankisusuallyinstalledontheflangeandfastenedwithmetalbolts.GIStanksaremadeelectricallycontinuousbythesemetalboltsandhavethesamegroundingpotential.EM-wavesleakfromt
6、hepartofthesolidinsulatorsurroundedbythesemetalboltsandtheGIStanks.Thisleakingpartformsaslotantennaandhasaresonantfrequencythatdependsonthespacingbetweentheboltsinthecircumferentialdirectionoftheflange.Atthisresonantfrequency,theoutputofexternallyleakingEM-wavesishigherandenablesmoresensit
7、ivemeasurement.Inthisstudy,thedetectioncharacteristicswithdifferentantennapositionsanddirectionswerecomparedinconsiderationofthenumberandpositionsoftheboltsonthespacer,andthefrequencycharacteristicsofvariousantennaswereobtained.Toimprovethedetectionsensitivity
