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动车组高压电缆局部放电性能测试研究.docx

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动车组高压电缆局部放电性能测试研究 Abstract Withtheincreasingpopularityofhigh-speedtrains,theperformanceandsafetyofthehigh-voltagecablesinthetrainshavebecomeincreasinglyimportant.Thepartialdischargetestisaneffectivemethodtoevaluatetheinsulationconditionofhigh-voltagecables,whichcanrevealthepresenceofdefectsandaginginthecableinsulation.Inthisstudy,weperformedpartialdischargetestsonthehigh-voltagecablesofaChinesehigh-speedtraintoevaluatetheirinsulationperformance.Theresultsshowedthatthepartialdischargecharacteristicsofthecableswereaffectedbyfactorssuchasthevoltagelevel,frequencyanddurationofthetest.Ourfindingsprovideareferencefortheevaluationoftheinsulationperformanceofhigh-voltagecablesinhigh-speedtrains. Introduction Dynamicperformanceandsafetyarethemostimportantparametersforahigh-speedtrainsystem.Thehigh-voltagecablesareanessentialpartofthetrain'spowersupplyandcontrolsystem.Theperformanceandsafetyofthehigh-voltagecablesarecloselyrelatedtothesafetyandreliabilityofhigh-speedtrains.Inrecentyears,withtheincreasingpopularityofthehigh-speedtrainsystem,thedemandforhigh-voltagecableswithexcellentinsulationperformancehasalsoincreasedsignificantly.Therefore,itisnecessarytoevaluatetheinsulationperformanceofhigh-voltagecablescomprehensively. Partialdischargeisaphenomenonthatoccursintheinsulationofhigh-voltagecableswhentherearedefectsoraging.Partialdischargecancauseinsulationbreakdownandevencompletefailureofthecable.Therefore,partialdischargemeasurementisanimportantmethodforevaluatinginsulationperformance.Thepartialdischargecharacteristicsofhigh-voltagecablesareaffectedbyfactorssuchasthevoltagelevel,frequency,anddurationofthetest.Thepurposeofthisstudyistoevaluatethepartialdischargecharacteristicsofhigh-voltagecablesinaChinesehigh-speedtrainandinvestigatetheeffectoftestfactorsonthepartialdischargecharacteristics. MaterialsandMethods Thehigh-voltagecablesusedinthisstudyweretakenfromaChinesehigh-speedtrain.ThecablesweremadeofXLPEinsulationandhadaratedvoltageof27.5kV.Weselectedapartialdischargedete