自耦变压器绕组辐向稳定性分析

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1、哈尔滨理工大学工学硕士学位论文TheStudyoftheAuto-—TransfomerWindingsRadialStabilityAbstractAsanextremelyimportantdeviceofgrid，powertransformers，playsanirreplaceablerole，whetherinpowerplants，substations，transmissionanddistributionnetworkaswellasthemajorityofusersandthen

2、ationaleconomyvarioussectors．Withtheconstructionoflargegird，thecontinuedincreaseofthetransformervoltagelevel，capacity,short-circuitpoweralsoincreases，windingsstabilityproblemshavebecomemoreandmoreserious．Tothisend，thispapertakea500kV、334000kVAautotransf

3、ormerasexample，Fromthemagneticpotentialbalanceprinciple，usethefiniteelementsoftware，adopt“field—circuitcoupling”method．respectivelybuild2一Daxisymmetricfiniteelementmodelwhenlowvoltage—COillillonwindingsrun，attheexitoflowvoltagewindingOccursthree-phasesh

4、ortcircuitandcommon-sedeswindingsrun，attheexitofcommonwindingoccursthree-phaseshortcircuit．Usemodeltosimulatetworunmodesshort-circuittest，striketheshort—circuitimpedancethroughsimulationresuits，contrasttothemeasuredvalues，andthenprovetheaccuratenessofth

5、emodel．Thus，theratedphasevoltageisappliedacrossthewinding，calculateforeachdiskshort-circuitcurrent，currentdensity,leakagemagneticfluxandshort-circuitpower．Whentwotransformer。windingsrun，thedirectionofthewindingscurrentiscontrary,radialshort—circuitpower

6、madetwowindingsmutuallyexclusive，thatisinternalwindinginwardbuck，externalwindingoutwardstretch．henceitneedtorespectivelychecktheinternalandexternalwindingstabilityundertheradialshort-circuitpower．Astotheinternalwinding，selectthediskwitchwithstandthebigg

7、estradialshort-circuitpower,usebeamelement，basedontheactualsizeofthedisk，establish3一Dmulti—spanmodelofasingledisk，uselinearbucklinganalysismethod，calculatetransformerradialcriticalbucklingload，andthenobtainthesafetyfactoratmaximumradialshort—circuitpowe

8、r．Basedonlinearbucklinganalysis，applynonlinearbucklinganalysismethod，loadedradialshort-circuitpoweronthe哈尔滨理工大学工学硕二b学位论文originalmodel，solvetheinternalwindingdisplacementundertheradialshortcircuitforce，andcarryoutchecking．Totheout