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雷电冲击下SF_6气体放电击穿电压分散性的实验研究.docx

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雷电冲击下SF_6气体放电击穿电压分散性的实验研究 Abstract ThepurposeofthisresearchwastoinvestigatethedispersionofdischargebreakdownvoltageunderlightningimpulseinSF6gas.Inthisexperiment,thevoltagedistributioncharacteristicsofSF6gasunderlightningimpulsewereanalyzedbymeasuringthedischargebreakdownvoltageofSF6gasunderdifferentelectrodegaps,gaspressure,andhumidityconditions.TheresultsshowedthatthebreakdownvoltageofSF6gasunderlightningimpulsewassignificantlyaffectedbyelectrodegapdistance,gaspressure,andhumidity.ThevoltagebreakdownofSF6gasdecreasedastheelectrodegapdistanceincreased,anditwasalsoinfluencedbythehumidityandgaspressure.ThisresearchprovidesascientificbasisfortheapplicationofSF6gasintheelectricalindustryandlaysafoundationforfurtherresearchonthedischargecharacteristicsofSF6gasunderlightningimpulse. Keywords:SF6gas,Lightningimpulse,Dischargebreakdownvoltage,Voltagedispersion Introduction SF6gas,whichhasmanyexcellentproperties,suchashighdielectricstrength,goodinsulationperformance,andthermalstability,iswidelyusedinpowersystemequipmentinsulations.Thegascanwithstandhigh-voltageandhigh-frequencyelectricalstresses.Amongtheelectricalbreakdownmodesofinsulatinggases,thelightningimpulsedischargeisconsideredtobethemostseriousphenomenon,whichcancausesignificantdamageandshouldbecarefullystudied. IntheapplicationofSF6gas,itisimportanttounderstandthebreakdownvoltagecharacteristicsofthegasunderlightningimpulse.ThevoltagebreakdownofSF6gasisaffectedbymanyfactors,suchasgaspressure,electrodegapdistance,andhumidity.Thesefactorsmayleadtothedispersionofthedischargebreakdownvoltage,whichmayimpactthesafeoperationofthepowersystemequipment. Inthisstudy,weaimedtoinvestigatethedispersionofdischargebreakdownvoltageunderlightningimpulseinSF6gas.WeconductedexperimentstomeasurethedischargebreakdownvoltageofSF6gasatdifferentelectrodegapdistances,gaspressures,andhumidityconditions. ExperimentalMethod Theexperimentwascarriedoutusingacylindricalstainless-steelelectrodesystemwithagasdensitycontroller.TheSF6gaswasfilledintot