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10350μs冲击电流波测试方法研究.docx

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10350μs冲击电流波测试方法研究 Introduction 10350μselectricalimpulsecurrentwaveisawidelyusedtestmethodinelectricalengineering,especiallyfortestingtheinsulationofelectricalequipment.Theapplicationofthistestmethodismainlytocheckwhetherelectricalequipmentcanwithstandtheimpulsevoltagecausedbylightningstrikesorswitchingoperations.Thismethodiscarriedoutbyapplyingahighvoltageimpulseofacertainwaveformanddurationtotheequipmentundertestandobservingtheinsulationpropertiesoftheequipment. Inrecentyears,theresearchonthe10350μselectricalimpulsecurrentwavetestmethodhasbeenincreasing.Thispaperwilldiscusstheprinciple,waveform,andtestingmethodofthistestmethod,andanalyzethefactorsthataffecttheaccuracyofthetest.Throughthestudyofthismethod,itisexpectedtofurtherimprovethedetectionlevelofelectricalequipmentinsulationandensurethesafeandstableoperationofthepowersystem. Principleof10350μsElectricalImpulseCurrentWave Theelectricalimpulsecurrentwavereferstoanimpulsewavewithadurationof10350μs.Itswaveformconformstoacertainstandard,anditsamplitudecanvarywithinacertainrange.Theimpulsecurrentwaveformisusuallyrepresentedbyacurrent/timegraph,whichreflectsthevariationofthecurrentvaluewithtimeduringtheimpulseprocess. Theprincipleofthe10350μselectricalimpulsecurrentwaveistoapplyahighvoltageimpulseofacertainwaveformanddurationtotheequipmentundertest,andtoobservetheinsulationpropertiesoftheequipment.Duringthetest,theequipmentisfirstchargedtoahighvoltage,andthentheimpulsevoltageisapplied.Whenthevoltagereachesthepeak,theimpulsecurrentflowsthroughtheequipment,andtheinsulationperformanceoftheequipmentistested. Waveformof10350μsElectricalImpulseCurrentWave Thewaveformofthe10350μselectricalimpulsecurrentwaveconformstotheinternationalstandard.Thepeakvalueoftheimpulsecurrentisusuallyexpressedastheamplitudeofthecurrentwave.Thewaveformoftheimpulsecurrentischaracterizedbytherisetime,duration,anddecaytime.Therisetimeanddecaytimerefertothetimerequiredforthecurrentwaveformtorisefrom10%to90%ofthepeakvalueandtofallfrom90%to10%ofthepe