變壓器繞組內(nèi)部短路故障的數(shù)值模擬方法研究.pdf

1、浙江大學(xué)碩士學(xué)位論文變壓器繞組內(nèi)部短路故障的數(shù)值模擬方法研究姓名：胡冠中申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：電工理論與新技術(shù)指導(dǎo)教師：姚纓英20060301浙江大學(xué)碩士學(xué)位論文ABSTRACTTransformersdosufferfromtheintemaishortcircuitfaultsmainlyduetointernalinsulationfailureThefaultproducesagreatercurrent，andtheloss

2、andheatal：ealsoincreased，TheinsulationfailurebecomesincreasinglysevereandfinallymakesthetransformeroutofworkTodetectatransformerinternalfault，atransformermodel，whichCansimulatethesefaults，isrequiredTheefficiencyofthemode

3、landtheexactnessofthesimulationareveryimportanttotheinternalfaultdetectionThispaperprovidesanumericalsimulationmethodpreciselysimulatingtransformerinternalfaultsbyusingFEAandstateequationofthesystemisproposedThismethodfo

4、undsafiniteelementmodeltosimulatetransformershorttestUsingtheparametersbyenergyperturbationstatefunctionCanbeestablishedtoanalyzethediversificationoftheterminalcurrentFirstlyamodelwhichsubtlysimulatesthewindingstructureo

5、fthetransformerbyFEATheinitializationregionpreciselymodelsthewindingturnConsideringthewindingstructureandthefaulttype，trallsformerinternalturngroundandtttmturnfaultissimulatedbyusingFEMandenergyperturbationmethodSecondly

6、thispaperprovidestheinductancecalculationformulabyenergyperturbationandalsoachievestheinductancematrixbyusingFEAItrevealsthatthismethodCansimulatetheworkconditionoftransformermagneticnonlinearcomponentThethird，inordertov

7、alidatetheexactnessofthemodel，aprogramisproposedtOcalculatetheinductancematrixbyusingleakagefactorsmethod，ItrevealsthatthemodelprovidedbythispaperiscorrectTheforthistransformerinternalshort—circuitfaultsimulationbyusingt