110kv+xlpe电缆附件局部放电超高频检测与传输特性的分析-(5269)

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1、哈尔滨理工大学工学硕士学位论文PartialDischargeDetectionusingUltraHighFrequencyinllOkVXLPECableAccessoriesandSignalPropagationPropertiesAbstractPartialdischarge(PD)inhi曲voltagecableaccessorieswillproducenanosecondsteeppulsecurrentandwidebandUHF(UltraHi曲Frequency)signals．However,theUHFelectromagn

2、eticsignalsaredifficulttoradiateoutward．UHFsignalswillattenuateseriouslywhenpropagatingalongthecablecore．nleUI-IFsignalsofPDaredifficulttodetectbecauseofthemetalshieldingofjointswhichwillabsorbUHFsignals．Ontllebasisofsignal．propagationtheoryandR．Jobava’Snumericalmodelofimpedanced

3、istributionweightedparameterratioofmultilayercompositemedium，UHFsiganlsgeneratedbypartialdischargepropagateincableandjointsisstudiedbyusingcapacitorcouplingmethod．Themainresearchworkisasfollows：刀船theoryofelectromagneticwavepropagationintheUHF—rangeisgiven．砀Preflectionandrefractio

4、nlawsarediscussedwhenelectromagneticwavesfromPDpropagateincompositemediumlayers．Theattenuationofsemi·conductinglayerisspeciallyanalysed．Amplitudeattenuationofpropagationcharacteristicscouldbederivedbycableequivalentcircuitandpropagationformula．Inordertoanalyzethepotentialproblems

5、duringtheproductionandinstallationprocess，threetypicaldefectmodelsin10kVXLPEcablejointaredesinged，usingthefiniteelementanalysismethod．Thedefect’Sposition，size，shapeandappliedvoltagearedeterminedonthebasisofresultsofsimulation．UHFpartialdischargedetectionsystemisestablished，andthe

6、widthofcapacitancecoupledsensorisdeterminedbycontrastexperimerit．UHFsignalsfromPDofthreetypicalmodelsaredectectedintheexperimentsystem．ThenthepropagationcharacteristicofUHFsignalsareanalysed．PatternrecognitionofUHFpartialdischargesignalsisconfirmedaccordingtoexperimentdataofthree

7、typicaldefectmodels．Keywordspartialdischarge，cableaccessories，propagationproperties，patternrecognitionII哈尔滨理工大学工学硕士学位论文目录摘要⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯IAbstract⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．II第1章绪论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯11．1课题研究的目的和意义⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯l1．1．

8、1XLPE电缆附件的重要性和故障类型⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．11．1．2局