变压器绕组变形的在线监测分析

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1、ABSTRACT————————————————————————————————————————————————————一一ABSTRACT：Powertransformerisailimportantpartofpowersystem，andthefailureotmepowersystemwillcausesignificanteconomiclossesandevens嘶ousconsequences．Transformerwindingsdeformationisanimportantfactoraffecfingthes

2、afeoperationofthetransformer．Therefore，theoperationreliabilityCanbeimprovedbythetestanddiagnosisofthewindingdeformation．Inthisthesis，metransf．er劬ctioncharacteristicsoftransformerwindingsisstudied，whichlayatheoreticalfoundationforon—linemonitoringdevelopmentoftransform

3、erwindingdeformation．Takingintoconsiderationthemutualinductanceandthe10ssoftransf．0nnerwinding，thesimulationmodeloftransformerwindingisestablished．嘲(ingacontinuoussinglewindingtransformerasanexample，thetransformerwindinginductanceandcapacitanceparametercalculationmeth

4、odoftheequivalentcircuitmodelareintroducedinthisthesis。Thechangesofthewindingstructureandsizecausedbydeformationindifferentformsanddegreesarestudiedbythestructuralparametersmethod·Andparametersoftheequivalentcircuitaccordingtothedeformationsituationarecalculated．Theba

5、sicprincipleoftransformerwindingdeformationdiagnosisbasedontransferfunctionmethodisstudied．Acriterionofthewindingdeformationdiagnosisisproposedbyusingthecorrelationcoefficientandtherootmeansquareofthespectrumdifferencei11differenttime．Thesimulationofdifferenttypesandd

6、egreetransformerwindingdeformationareusedtoanalyzetheinfluenceofthetransferfunction．Thecorrelationcoe硒cientaIldtherootmeansquarevalueofthetransferfunctioncurvesaredemonstrated，whichcanbeusedasacharacteristicparameterforwindingdeformationdegreediagnosis．Andthecorrespon

7、dingjudgingthresholdbetweenmild，moderateandseveredefbnnationaI．egiven．Thetransferfunctioncurvecanbedividedintolowfrequencv，intennediatefrequencyandhighfrequencyaccordingtothepolenumber．Weshouldcalculate￡hevalueofthecorrespondingsegmentstojudgewindingcondition．7rhesimu

8、lationmodelISverifiedbytheexperiment，anditprovidestheoreticalbasisandalgorithmfortheon—linemonitoringofwindingdeformation．Th