天大自动化学院绝缘技术课件8

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1、HVLABSchoolofElectricalEngineeringandAutomationTianjinUniversity,Tianjin300072,CHINAIntroductiontoPartialDischargeandDiagnosticsforHighVoltageEquipmentBackgroundtoinsulationdiagnosticsandfailureIntroductiontopartialdischargeOn-linepartialdischargetestmethodsExampleresultsPDasanassetmana

2、gementtoolConclusions本讲内容MV&HVPlantCommissioningQualityAssurance（中低压电站投入运行设备的安全保障）Ageingpopulationproblem（基于绝缘老化带来的影响）Toprovidereliablelifeextension（提供可靠寿命延伸评估）Tofocusplantrepairsandtargetreplacements（电站设备维修与设备更换）Toavoidunplannedoutages（避免无计划停电）Troubleshootingandfailureinvestigations（检修

3、与事故调查）Safety(mostlywithcableterminations&sealingends/outdoorHVplant)（安全角度）为什么要进行绝缘诊断?InternalInsulationfailure（内部绝缘破坏）Thermalrunawayofinsulation（热击穿）Corrosionrelatedfailures（电化学击穿）Lightningandimpulseflashoverfailures雷滑闪击穿Lossoffluidorgas,leadingtoinsulationfailureAccessoriesfailures(ter

4、minations,cableboxes,CTs,VTs,HVPDCouplersetc)附件破坏Other(fire,explosion,thirdparty)绝缘破坏类型DestructiveTests（破坏性试验）Breakdowntests击穿试验Impulsetests脉冲试验Destructiveexaminations破坏性试验Mechanicaltests机械测试NonDestructivetests（非破坏性试验）Voltagepressuretests(VLFHi-pot)耐压试验Partialdischarge(PD)testing局部放电测试D

5、ielectriclossangle(TanDelta)介质损耗测试Insulationresistance绝缘电阻Stepvoltagemeasurements布进电压Resistancetests阻抗测试ThermographicSurveys形变测试Typetests（型式试验）SeeHVPlantManufacturerslistsoftests测试方法局部放电现象“Alocalisedelectricaldischargethatonlypartiallybridgestheinsulationbetweenconductorsandwhichcanorca

6、nnotoccuradjacenttoaconductor”IEC60270Definition局部放电的定义?VoidinInsulationSharp,Irregularsurfaceonconductor‘Floating’metalworknearconductorsTreeGrowthininsulationCoronafromsharpobjectsathighvoltageSurfaceDischargesInternalPDInternalPDInternalPDInternalPDExternalPDExternal/SurfacePDExterna

7、l/SurfacePDSurfacePDfrominducedvoltages局部放电的类型+VVoidInsulation等效电路Breakdownpaths-V绝缘体内部气泡局部放电的例Actualmeasuredcurrentpulses(thesearestochasticinnature)Va局部放电模型XLPE聚合物的电树枝生长绝缘纸的电痕现象绝缘老化的实例干式终端的绝缘纸电痕破坏现象trees交联聚乙烯中蝴蝶状水树及其电树击穿LowLight,HighDefinitionPhotostakenatNightInsulatorString