汽轮发电机定子绕组内部电气故障研究

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1、河海大学硕士学位论文汽轮发电机定子绕组内部电气故障研究姓名：徐树峰申请学位级别：硕士专业：农业电气化与自动化指导教师：马宏忠20070301ABSTRACTAsthebasicequipmentofelectricenergyproduction，synchronousgeneratorplayaveryimportantroleinsafetyandstabilityofthewholepowersystem．W确therapiddevelopmentofelectricutilityindustryandtheincreasingcapacityofgenerator,inc

2、reasingreliabilityforsafeoperationofgeneratorisrequired．Intemalfaultsinstatorwindingsarethecommonelectricalfaultofagenerator．Mostofthesefaultsareinitiatedfromfailureofmonitoringtheturn-to—turnshortcircuitintime．Iftheintemalfaultsaredevelopedwi血outcontr01．therewillbedisastertothestatorwindings

3、．Faultanalysisanddiagnosishaveessentialmeaningintheoryandpracticalvalueinengineering．Inthisthesis，thefinite．elementmethod(FEM)wasusedasthetheorybasisofelectromagneticfieldanalysisofgenerator．Ansoftsoftwareisusedasatoolforanalysisandsimulation．Thefiniteelementmethodisapowerfulmethodtosolveelec

4、tromagneticboundaryvalueproblems．Inthecurrentperformanceanalysisofthemotorandotherfieldsontheelectromagneticfieldcalculation，almostwithoutexception，thefiniteelementmethodorrelatedmethodsofthenumericalcalculationwereadopted．Andthepre-processingoffiniteelementmethodiSaverykeystepforfiniteelemen

5、tanalysisbecauseitiSrelatedtotheaccuracy．’l,computerefficiencyandshareresourcesBasedonAnsofiSMaxwel2Dsoftwareenvironment．thesimulationturbogeneratormodel(TheNo．3simulationgeneratorindynamicsimulationlaboratoryofHohaiUniversity)wasestablished．Thenthedistributedconditionoftheelectromagneticfiel

6、dofgeneratorinnormalandfaultstatusWascalculated．nlefaultdiagnosisforthegeneratorwasdonebypost-processingthesimulationresults．Accordingtotheanalysisofthesimulationresults，incombinationwiththetestdataofNo．3simulationgeneratorofdynamicsimulationlaboratory,tlleinfluenceoftherelatedelectricalparam

7、etersofthegeneratorwhichcausedbyimemalfaultsofstatorwindingWasanalysedsystematicly．Thechangeoftheelectricalparameterssuchasthree—phasestatorcurrentandfieldcurrentindifierent10adlevelsanddifferentshortturnwasdescribed，thefault1aWSwasfound．Thec