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1、哈尔滨理工大学工学硕士学位论文AnalysisofShortCircuitFaultsforHydro-GeneratorwithAsymmetricBrandWindingsAbstractInthehydro-generatordesignprocess,thechoiceofratedspeedshouldnotonlyconsiderbasicparameters,suchasratedvoltage,ratedpowerfactorandstatorlineload,butalsoconsidertheturbinespeed.Asaffectedbyhydr
2、aulicconditionsinthedesignofhydraulicturbinespeed,theseparametersoftendonotmatcheachother.Inordertoimprovethegeneratordesignrationalityasymmetricbrancheswindingconnectionmethodisadopted.Inthispaper，a300MWhydro-generatorwithasymmetricbrandwindingistakenasanexample,thetransientprocessesofs
3、tatorwindingandfieldwindingshort-circuitfaultsareanalyzedandsimulatedbasedon2-Dfiniteelementmethod.Firstly,thesymmetryconditionofthestatorwindingwasanalyzed,andputforwardtwomethodswhichweresuitablefortheasymmetricbrandwindings,accordingtothetraditionalwindingconnectionofthelapwindingandt
4、hewavewinding.Thenthemethodwasusedtogettwowavewindingconnectionschemesandtwolapwindingconnectionschemes.Establishmentofa2Dfield-circuitcoupledfiniteelementmodeltosimulateloadoperatingconditionsanalysisandmanyusefulphysicalquantitieswereobtained,suchasbranchcurrentwaveform,phasevoltagewav
5、eformandharmoniccontent,etc.Secondly,intheno-loadoperationcondition,simulationanalysisofthree-phaseshortcircuit,two-phaseshortcircuitandsingle-phaseshortcircuitthreekindsofcircumstances,Getthreephasecurrent,eachbranchcurrentandtheexcitationwindingcurrenttransientwaveforminthefaulttime.An
6、alysistherulesofthebranchcurrentindifferentwindingconnectionmethod,revealsthebranchcurrentcharacteristicsofasymmetricbrancheswindingofturbinegeneratorfaulttime.Atthesametime,dampingwindinginfluencedonstatorcurrentandexcitationwindingcurrentofthesethreekindsoffaultswasstudied.Finally,chan
7、gingruleofexcitationwindingcurrentandfraction-harmonicsofbranchcurrentwerestudied,throughtheanalysisofexcitationwindinginter-turn-II-哈尔滨理工大学工学硕士学位论文shortcircuitfaultontheno-loadoperations,andthepositionoffaultinfluencedoncharacteristicsofbrandcurrentwasstudiedtoo.Usingthi
