高电压设备测试（High Voltage Equipment Testing）（英文版）课件 Worksheet 4 AC Voltage Withstand and .pptx

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高电压设备测试（High Voltage Equipment Testing）（英文版）课件 Worksheet 4 AC Voltage Withstand and .pptx

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《HighVoltageEquipmentTesting》ACVoltageWithstandandSeriesResonanceWithstandTest主讲人：何发武（副教授）

OperatingWorksheet：WithstandVoltageTest

TableofContents01Followme02Workshop03Training

01Followme

Ⅰ.OverviewofACWithstandVoltageTestDuetofactorssuchasmoisture,insulationaging,anddamage,theinsulationperformanceofelectricalequipmentmaydeteriorate.TheACwithstandvoltagetestisthemostdirectandeffectivemethodtoevaluatetheinsulationadequacyofelectricalequipment.Thepurposeofthetestistoassesstheinstallationqualityandinsulationstrengthoftheelectricalequipment.Generally,thewithstandvoltagetestisconductedduringequipmenthandover,majorrepairs,andannuallyafterpassingtheinsulationpreventivetesttopreventinsulationaccidents.

Ⅰ.OverviewofACWithstandVoltageTestSincetheACwithstandvoltagetestisadestructivetest,priortestssuchasinsulationresistance,DCleakagecurrent,anddielectriclossmustbeperformedonthetestspecimen.OnlywhenthetestresultsarenormalcantheACwithstandvoltagetestbeconducted.Ifpoorinsulationconditionssuchasmoistureandlocaldefectsarefoundintheequipment,theyshouldbedealedwellbeforeconductingthewithstandvoltagetesttoavoidunnecessaryinsulationbreakdown.Newlyinstalledoil-insulatedequipment,suchastransformersandcircuitbreakers,alsorequireawaitingperiodofatleast48hoursforallgasbubblestoescapefromtheoilbeforethetestcanbeperformed.Ifitisgas-insulatedelectricalequipment,thetestshouldbeconductedunderthelowestallowablegaspressuretoeasilydetectinternalinsulationdefects.

Ⅰ.OverviewofACWithstandVoltageTestThewithstandvoltagetestcanbedividedintothefollowingcategories:powerfrequencywithstandvoltagetest,inducedvoltagewithstandvoltagetest,andimpulsevoltagetest.Thepowerfrequencywithstandvoltagetest

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高电压设备测试（High Voltage Equipment Testing）（英文版）课件 Worksheet 4 AC Voltage Withstand and .pptx