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500kV主变压器冷却器全停跳闸分析及处理.docx

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500kV主变压器冷却器全停跳闸分析及处理 Abstract: Thispaperanalyzesanddealswiththefull-stoptrippingofthecoolingsystemofa500kVmaintransformer.Thepaperintroducestheprinciplesofthecoolingsystemandthereasonsforthetripping,analyzesthecausesofthetrippingincombinationwiththeoperationandmaintenanceofthetransformer,andproposessolutionstoensurethesafeandstableoperationofthetransformer. Keywords:500kVmaintransformer,coolingsystem,full-stoptripping,causes,solutions Introduction: The500kVmaintransformerisanimportantequipmentinthepowersystem,anditsstableoperationisdirectlyrelatedtothesafeandreliableoperationofthepowersystem.Thecoolingsystemofthetransformerisakeypartofensuringthenormaloperationofthetransformer.However,inpracticaloperation,thecoolingsystemofthetransformeroftenhasproblemssuchasfull-stoptripping,whichaffectsthesafeandstableoperationofthetransformer.Therefore,itisnecessarytoanalyzethecausesofthefull-stoptrippingofthecoolingsystemofthe500kVmaintransformerandproposeeffectivesolutions. Principlesofcoolingsystem: Thecoolingsystemofthe500kVmaintransformerismainlycomposedofacoolingoilpump,acooler,acoolershell,acoolerfan,acooleroilcircuitandacoolercontrolsystem. Theprincipleofthecoolingsystemistocirculatethecoolingoilthroughthetransformerwindings,thecoreandthecooler.Theheatgeneratedbythetransformerisabsorbedbythecoolingoilandthentransferredtothecooler.Thecoolerexchangesheatwiththeambientairthroughthecoolerfantodissipatetheheat,thusensuringthenormaloperatingtemperatureofthetransformer. Causesoffull-stoptripping: Thefull-stoptrippingofthecoolingsystemofthe500kVmaintransformerismainlycausedbythefollowingreasons: 1.Insufficientoilvolume:Theinsufficientoilvolumeinthecoolercancausethetemperatureoftheoilinthecoolertoriserapidly,andthetemperaturesensorwillsendasignaltothetriprelaytocutoffthepowersupply. 2.Coolerfanfailure:Thecoolerfanisakeycomponentofthecoolingsystem,whichisresponsiblefordissipatingtheheatofthecoolingoil.Thefailureofthecoolerfancancausethetemperatureoftheoilinthecoolertoriserapidlyan