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1、重庆大学硕士学位论文交联聚乙烯电缆局部放电在线监测及定位研究姓名：杜言申请学位级别：硕士专业：电气工程指导教师：廖瑞金20060501重庆大学硕士学位论文英文摘要AbstractWiththedevelopmentofelectricalindustrial,XLPEhasbeenusedwidelybecauseofitssuperiorelectricalandmechanicalproperty.Inordertoensurethesafetyoftransmissionnetwork,detectionof
2、XLPEhasbeenpaidgreatattention,andtheon-linemonitoringandlocationofpartialdischargeoccurredinXLPEbecomeoneoftheissuesofgeneralinterest.Basedonthetransmissioncharacteristicofpartialdischargeincable,azCablemodelconsideringskineffectisestablishedbyusingPSCAD/EMTDC
3、.Accordingtosimulationresults,thetransmissionandattenuationofpartialdischargehavebeenverifiedwhichsetthefoundationfordelay-timeestimationalgorithmforPDsiteslocation.Aself-integratingnetworkbasedbroadbandcurrentsensorforPDisdesignedandperformanceparameterareana
4、lyzed.Moreover,theresponsesensitivityandfrequencybreadtharestudiedfromintegratingresistance,magneticcorematerialofcoil,sectionalareaofwireandnumberofwindings.Frontendcircuitisdesignedandanexperimentalplatformisestablished.Accordingtospecifictypesofpartialdisch
5、argeofXLPE,3typicaldischargemodelsaredesigned.Duringtheexperiment,PDsignalscorrespondingtofourdefectsarecollected,andnoisecontainedinthemareeliminatedbywavelettheory.Simulationindicatede-noisehasachievegoodresults.Twotime-delayestimationalgorithmsforXLPEPDsite
6、slocation,namely,waveletbasedgeneralcorrelationmethodandtwiceweightedmethod,areproposed.Waveletbasedgeneralcorrelationmethodrelaxtheassumedconditionfortime-delayestimationofdirectcorrelationmethod,overcometheinaccuracyoflocationwhenPDsignalcorrelatewithnoise,e
7、xtendtheapplicationoftime-delay,andhavehighdegreeof3accuracyonscale2.Twice-weightedmethodbasedonwaveletisnotonlyparticularlysuitfortime-delayestimationunderlowSNR,butalsosuitforthePDLocationinlong23cableonscale2and2.However,itcannotovercomethelimitationofnon-c
8、orrelationbetweensignalandnoiseneededbygeneralcorrelationmethod.Accordingtothesimulation,bothofthetwoalgorithmscansuitforPDlocationofXLPEwithhighaccuracy.Inpractice,itshouldusethem
