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1、哈尔滨理工大学工学硕士学位论文TheAnalysisoftheLargeCapacityTransformer
WindingsRadialStabilityAbstractPowertransformersoccupiesaveryimportantpositioninthemoderngridoperation,thatthemainroleresponsibleisenergyredistributionandchangethevoltagelevel,soitisamoreexpensiveandmoreimportantequipmentinthepowersy
2、stem.Inrecentyears,withthevigorousdevelopmentofourcountry'selectricityindustry,thevoltagelevelandcapacityoftransformerbecomeincreasinglydemanding,inthiscase,whenthepowertransformersuddenshort-circuit,windingswithstandelectricpowerisalsogrowing,whichthestabilityofthewindingsformedahugechal
3、lenge.Inthispaper,takinga120MVA/220kVdouble-windingpowertransformerasasimulationexamples,usingANSYSfiniteelementanalysissoftware,introducingthe"field-circuitcoupling"method,thenbuildingtwo-dimensionalfiniteelementmodelwhenlowvoltagewindingsoccurthree-phaseshort-circuit,usingthesimulationr
4、esultsofshort-circuitimpedancetoprovetheanalysismethodsandmodelsarecorrect.Onthisbasis,thencalculatethehighandlowvoltagewindingsmagneticfluxleakagedistribution,fluxdensity,axialandradialshort-circuitpowerinbothdirections.Thelowvoltagewindingisastheinternalwindingvoltageandthehighvoltage
w
5、indingisastheouterwindingintwo-windingpowertransformer,duetotheradial
forceActingonthetwowindingswhenashort-circuitoccursaredifferentdirections,
thatislowvoltagewindingwithstandinwardlycompressivestress,whilethehigh
voltagewindingwithstandtensilestresswhichissurroundedbyanoutwardly,so
the
6、reisaneedtoassessmentthetwowindingsstabilityrespectively.Forlowvoltage
winding,introducingtothelinearbucklinganalysismethod,takingthediskthat
withstandthemaximumshort-circuitpowerasasimulationmodel,thencalculatethe
criticalbucklingstress,andcomparewiththeactualradialstressobtainsthesafety
7、
factor.Basedonthelinearbucklinganalysis,usingthenonlinearbucklinganalysis
whichismoreaccurateincomputingandmorecommonlyusedinengineeringfield
tosolve,thenobtainsthecriticalradialdisplacementvalueofthedisk.Atlast,-II-哈尔滨理工大学工学硕士学位论文calculatethecriticalbucklingdispla
