电力变压器的局部放电及测量

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1、ReviewofLecture71.PartialDischargeinPowerCapacitors2.ParametersandStandard3.ElectricalDetectionofPDinCapacitorContents:ParameterstoestimatethePDofcapacitorApparentcharge,qInceptionvoltage,UiExtinctionvoltage,UeChangeofqwithvoltageapplyingtime1PowerSourceCompen

2、sationreactorisusedinseriesorparallelwithCxsothattodecreasethecapacityoftestingtransformerReviewofLecture7CurrentsthroughLandCwhilethetwoelementsconnectedinparallelVoltagesacrossLandCwhilethetwoelementsconnectedinseries2ReviewofLecture7DetectioncircuitsStraigh

3、tdetectioncircuitsBalanceddetectioncircuit3ReviewofLecture7SomeproblemsneedtobenoticedDetectionimpedancesisrequiredtowithstandlargecurrent.SeveraldetectionimpedancesareneededtomatchthecapacitorsamplesConnectiontypesofcapacitorelementsinfluencedetectionresults.

4、4Lecture8PDDetectioninPowerTransformers电力变压器的局部放电及测量5Contents1.SignificanceofPDdetectioninTransformer电力变压器测量局放的重要性2.PDPropagationinWindings4.DetectionCircuitsforTransformers5.Calibration6.TheInfluenceofDischargesinBushing3.TestProcedureandPermissibleApparentCh

5、arge7.ElectricalLocationofPDinTransformers局部放电在绕组中的传播测试程序和允许放电水平变压器局部放电的测试回路校正套管放电的影响变压器局部放电的电气定位方法61.SignificanceofPDDetectioninTransformerpowerfrequencywithstandtestimpulsewithstandtestPDoftenaffectsthetransformer’spropertiesinalong-termperiod.Thewithstandst

6、rengthinashorttimedoesnotchangesignificantly.Withstandtestisdestructive,thevoltageissohighthatinsulationiseasytobedamaged.工频耐压试验冲击耐压试验局部放电通常影响变压器的长期运行性能，而对短时的耐压强度影响不大。耐压试验是有损试验，容易对绝缘造成破坏ThevoltageofPDtestismuchlower,andthetestingdurationislonger(0.5~1h).局部放电试验

7、的试验电压相对较低，试验持续时间也较长72.PDPropagationinWindingsEquivalentcircuitofatransformerwindingC-groundcapacitanceperunitlengthL-inductanceperunitlength,parasiticinductanceK-seriescapacitanceperunitlength,longitudinalcapacitanceO-neutralpointA-highvoltageend单位长度对地电容单位长度的串

8、联电容单位长度的电感，即寄生电感中性点高压端8Equivalentcircuitofawindingwithacavitydischargesource2.PDPropagationinWindings92.PDPropagationinWindingsVoltageresponsealongthewinding沿绕组的电压响应103.TestProcedu