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1、ConferenceRecordofthe1996IEEEInternationalSymposiumonElectricalInsulation,Montreal,Quebec,Canada,June16-19,1996InfluenceofNegativeCorona-chargedSurfaceProtectiveMaterialonSurfaceDepletionRegionWidthZhangFengXuChuanXiangZhangShaoYunDepartmentofElectricalEngineeringXi'anJiaotong
2、University,ChinaAbstract:Thechangeofthesurfacedepletionregionwidth(SDRW)ofpnjunctionforhighvoltagesiliconrectifierscausedbynegativecorona-chargedsurfaceprotectivematerialhasbeenstudied.NegativecoronachargemakesthesurfacechargedensityofaSiOtinsulatorinterfacenegativeandthus,cau
3、setheSDRWtoexpand.ThephotocurrentmethodisusedtomeasuretheSDRWofreverse-biasedpnjunctionwithpositivebevelanglemesastructure.ThechangeSDRWcanbecausedbythedecayofthesurfacechargedensity.TheexpanseoftheSDRWtendtosaturateasthevoltageofthecoronaisincreased.Thedecayprocessisdifferent
4、withdifferentsurfaceprotectionmaterials.Numericalcalculationwereperformedandthesurfacechargedensityofnegativecorona-chargedinsulatorswasfoundtobeapproximately-louchargeslcm?INTRODUCTIONPolymershavebeenwidelyusedthroughouttheelectricaldepletionregionofapositivebevelanglerectifi
5、erbendsandelectronicindustry,suchaselectricaldevices,electricalupward.Whenthereisactualsurfacecharge,thedepletionwire,cable,etc.Besidesconductivity,dielectricloss,regionchangeswiththedifferentsurfacechargedensity.Thepotentialdischargeandbreakdown,therehasbeenpositivesurfacecha
6、rgenarrowsthesurfacedepletionregion,considerableinterestsinthecharacteristicsofthecorona-whilenegativeoneswidensit.chargedinsulators.ManyexperimentsandheoreticalworksForadefinitebevelangle,8isaconstant.Thereishavebeencarriedouttodeterminedtheprocessesbywhichacorona-chargedinsu
7、latorbecomesdischargedwhenrestingonanearthplane[l].Manymethodshavebeendeveloped,suchastheconstant-currentmodeandconstant-voltagemode[2],TSCandmanyothers.Thesurfacepotentialq=W;,+AW~+AW~measurementisoneofthemorewidelyusedmethod[3]andtheworkdonebyIeda[4]isatypicalexample.AWDisth
8、edegreeofdepletionregionbendsupwarddueToimprovethejunction-br
