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1、大型电力变压器短路事故统计与分析StatisticsandanalysisofshortcircuitaccidentoflargepowertransformerWangMengyunLingminin1Thepowertransformerinthepowersystem,shortcircuitistryingtoavoidpeopleandisnotabsolutelyavoid,especiallyexports(end)shortcircuit,overcurrentgeneratedhugemechanicalforce,greatharmtothepo
2、wertransformer.Therefore,thenationalstandardGB1094andtheinternationalstandardIEC76havemadethecorrespondingstipulationtothewithstandingshortcircuitcapacityofthepowertransformer.Itrequeststhatthepowertransformershouldbeabletowithstandallkindsofshortcircuitaccidentsintheoperation.However,n
3、earlyfiveyearsofnational110kVandabovevoltagelevelsofpowertransformeraccidentstatisticsanalysisshowsthattheleadingcauseoftheaccidentisnotenoughtocauseashortcircuitstrengthhasbecomeapowertransformeraccident,seriouslyaffectingthesafeandreliableoperationofpowertransformer.Thisisduetoexterna
4、lshortcircuitcausedbyastatisticalanalysisofpowertransformerfaults,andproposedtoreducethiskindofaccidents,triedtopromotetheimprovementofthepowertransformerfactoryproductsandperfect,andpromotetheoperationdepartmentstofurtherimprovetheoperationmanagementlevel.2shortcircuitaccidentoflargepo
5、wertransformerAccordingtoincompletestatisticsfrom1991to1995,thenational110kVandabovevoltagelevelofpowertransformeraccidentoccurred317times,thetotalcapacityoftheaccidentis25348.6MVA.Theaverageaccidentrateperunitis0.83%,andtheaverageaccidentrateofcapacitymeteris1.10%.Intheseaccidentsdueto
6、externaldamagecausedbyshortcircuitofpowertransformeris93times,thecapacityof6677.6MVA,accountingforthesameperiodof29.3%timesthetotalaccidents,accidentsaccountedforthetotalcapacityof26.3%(seeTable1).Table11991~1995thepowertransformershort-circuitaccidenttimesandcapacitystatisticsItisnotdi
7、fficulttoseefromtable1thattheshort-circuitstrengthofpowertransformerisnotenough,whichhasbecomeoneofthemainreasonsleadingtothedamageofpowertransformers,andhasbecomeaprominentproblemintheoperationofpowertransformers.Therefore,itisimperativetoimprovetheantishortcircuitcapacityofla