变频调速牵引电机绝缘局部放电行为及影响机理的研究

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1、西南交通大学硕士学位论文变频调速牵引电机绝缘局部放电行为及影响机理的研究姓名：郭小霞申请学位级别：硕士专业：高电压与绝缘技术指导教师：吴广宁20090501AbstractWiththedevelopmentofhighpowersemiconductordevices，frequencycontroldrivesystemsarewidelyusedinthefieldoflocomotivetraction．PulseWidthModulatedfPWM)techniquewhichprovidesmotorsupplyvoltagesischaracterizedbysq

2、uarewaveforms，widthmodulated,withsteeprisefrontslewrateupandhighpulserepetitionfrequency．Forthisreason，electricalinsulationoftractionmotorCanbeprematurefailuresundersuchpulsewaveforms．BecausedesignandmanufacturetechnologyofACmotorisnotcompletelysuitablefortractionmotorsuppliedbysuchadjustabl

3、espeeddrivesanymore，itisessentialmatcomprehensiveresearchforelectricalinsulationofelectricmotorsuppliedbyPWMvoltage．Thethesisisbasedonthelatestresearchresultsathomeandabroad，andpartialdischarge(PD)whichisoneofthemajorfactorsleadingtoagingofinsulationsisused餐mainobjects．Activityandmechanismof

4、PDofinsulationsystemoftractionmotorsuppliedbyadjustablespeeddrivesisinvestigated．Thesereasearchresultswillgreatlypromoteadvancementoftheoryofagingandbreakdownundersuchpulsecondition．Asaresu地frequencycontroltechniqueCanbewidelyused．AsthePDsignalbelongstorandomsignal，occurringprobabilityanddis

5、chargeamplitudearelargelyinfluencedbythedelay-timeofinitialelectron．However,theappearanceofinitialelectronisgenerallyrandom，SOstatisticsandanalysisofthatsignalisalwaysthehotissuehomeandabroad，whichneedstobefurtherresearched．Moreover,aunifiedviewpointonPDactivitiesandmechanismofinsulationunde

6、rdifferentsquarepulseshavenotbeenreachedpresently,whichalsoneedstobefartherstudied．Thisthesisdevelopsresearchworkaimingattheaboveproblems．Firstly,setuptheinsulationagingandPDmeaSurementmethod．UltravioletlightingWasaddedduringtheprocessofPDmeasurement,whichWasusedtoexcitephotoionization，addth

7、eappearanceprobabilityofinitialelectron,anddecreaSetheinfluenceoftimedelay．Secondly,SEManalysisofsamplesagedunderdifferentconditionsWasConduCted·TheinsulationdamagedegreecausedbyPDwasmored眈ctlvuIlde咖0dfrommicrocosmiclevelandmeanwhilecomparethecoron