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1、华北电力大学硕士学位论文AbstractRunningUHVtransmissionlineswillinevitablybumpedintheconstructionprocessleadingtoscratchthewireorwireitselfexistsprominentmetal,forminglocalcoronadischargepointsources.Atpresent,inordertoreducethecoronaloss,widelyusedincreasingthewi
2、rediameterorthenumberofsplitormethodofincreasingtowerheight.Althoughthesemethodscanachievetheeffectofreducingthecoronaloss,buttheinvestmentislarge,andtolarge-scalereplacementofwiresorraisethetowerheightisunrealistic,therearesomelimitationsinpractice.T
3、herefore,forthetransmissionlineconductormadelaterepairinevitablyakindofeffectiveshortcuttoreducethecoronaloss.ThispaperdiscussesuseRTVcoatingtoimprovethetransmissionlinecoronadischargephenomenon.Studyingtransmissionlinecoronalossbycoronacageisacost-ef
4、fectivemethod.Coronacagecansimulateconductorsurfacefieldstrengthconditionsoftransmissionline.Coronacageiswidelyusedinconductorcoronacharacteristicsstudy.Paperbasedonthelaboratorysmallcoronacage,useultravioletimagingtechniquetomonitorcoronadischargeofs
5、moothconductorandLGJ400/50underscratchesandprotrusionsurfacestate,andtheinfluenceofdischargeafterpaintingcoating.Usecoronalossmeasurementsystemmeasuringresistancecurrentandcoronaloss,usingthemethodoftangentplaythecoronaonsetvoltage,analysistheeffectof
6、coatingonthecoronaloss.Theresultshowsthatcoronaonsetvoltageofwireunderscratchis105kv,afterpaintingcoatingthevoltagebecome120kv,increased14.29%.Whenthevoltageis130kv,coronalossdecreased55.0%;Undertheconditionofthesurfacecoatedcarbonparticles,afterpaint
7、ingcoatingthecoronaonsetvoltagefrom96kvto109kv,increased13.54%,whenthevoltageis130kv,coronalossdropped24.6%.Theexistenceofthescratchesandprotrusions,maketheconductorcoronainceptionvoltagedropped,letthewirecanreachcoronaonsetvoltageunderlowervoltage,pa
8、intcoverchangedthesurfaceconditionofthewire,improvedthecoronaonsetvoltage,andunderthesamevoltage,theconductorsurfacedischargephenomenonblunts,thecoronalossisreduced.Keywords:smallcoronacage；transmissionline；coronadischarge；anti-coronacoating；c
