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1、哈尔滨理工大学工学硕士学位论文TheAnalysisoftheLargeCapacityTransformer
WindingsRadialStabilityAbstractPowertransformersoccupiesaveryimportantpositioninthemoderngridoperation,thatthemainroleresponsibleisenergyredistributionandchangethevoltagelevel,soitisamoreexpensiveandmoreimportantequipmentinthepowersyst
2、em.Inrecentyears,withthevigorousdevelopmentofourcountry'selectricityindustry,thevoltagelevelandcapacityoftransformerbecomeincreasinglydemanding,inthiscase,whenthepowertransformersuddenshort-circuit,windingswithstandelectricpowerisalsogrowing,whichthestabilityofthewindingsformedahugechalleng
3、e.Inthispaper,takinga120MVA/220kVdouble-windingpowertransformerasasimulationexamples,usingANSYSfiniteelementanalysissoftware,introducingthe"field-circuitcoupling"method,thenbuildingtwo-dimensionalfiniteelementmodelwhenlowvoltagewindingsoccurthree-phaseshort-circuit,usingthesimulationresults
4、ofshort-circuitimpedancetoprovetheanalysismethodsandmodelsarecorrect.Onthisbasis,thencalculatethehighandlowvoltagewindingsmagneticfluxleakagedistribution,fluxdensity,axialandradialshort-circuitpowerinbothdirections.Thelowvoltagewindingisastheinternalwindingvoltageandthehighvoltage
windingis
5、astheouterwindingintwo-windingpowertransformer,duetotheradial
forceActingonthetwowindingswhenashort-circuitoccursaredifferentdirections,
thatislowvoltagewindingwithstandinwardlycompressivestress,whilethehigh
voltagewindingwithstandtensilestresswhichissurroundedbyanoutwardly,so
thereisaneedt
6、oassessmentthetwowindingsstabilityrespectively.Forlowvoltage
winding,introducingtothelinearbucklinganalysismethod,takingthediskthat
withstandthemaximumshort-circuitpowerasasimulationmodel,thencalculatethe
criticalbucklingstress,andcomparewiththeactualradialstressobtainsthesafety
factor.Base
7、donthelinearbucklinganalysis,usingthenonlinearbucklinganalysis
whichismoreaccurateincomputingandmorecommonlyusedinengineeringfield
tosolve,thenobtainsthecriticalradialdisplacementvalueofthedisk.Atlast,-II-哈尔滨理工大学工学硕士学位论文calculatethecriticalbucklingdispla
