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1、AnalysisofCurrentDuetoClosingLoopinDistributionNetworkBasedonAngleChangingXUANKeGUOXiaojing，ZHANGFugangElectricalEngineeringCollegeofNortheastDianliLuoyangPowerSupplyCompanyUniversityLuoyangCity，HenanProvince，471000，ChinaJilinCity，JilinProvince，132012，Chinae-mail:xuanke021@163.comAbstract—P
2、ointtotheproblemofthelarge-scalepowercut,whileanalysistheloopcurrentbeforeclosedloopoperation,findingtheloopclosingoperationindistributionnetworkwillgenerateoutthefactorsaffecttheclosedloopcurrentandtakinglargeloopcurrent,itwillcausetheover-currentprotectionoreffectivemeasures;ithasimportan
3、tsignificancetothesafequick-breakprotectionoperation.Anewalgorithmofcalculation[1-3]andstableoperationofthegrid.andanalysistheloopcurrentindistributionnetworkisproposed,Thereference[4-7]commonlyofferedthepracticalamathematicmodelthatconsideringtheanglechangingbetweencalculationmethodofclose
4、dloopcurrent,usedtheequivalencethemaintransformersisestablished,thesteady-statecirculartheorem,thesteady-statecurrentandsurgecurrentofclosedcurrentcanbeobtainedbyadoptingtwo-stagemethod,throughloopcouldbeobtainedthroughasimpleandapproximatetheestablishmentofdifferentialequationstoderivether
5、elationshipbetweenimpactcurrentandsteady-statecircularcalculation.However,thesimplifiedcalculationmodelistoocurrent.Inthepowerflowcalculation,theloopcurrentissimple,thecalculationresultscanbutroughlyapproachedtheaffectedthatduestotheanglechangingandtheproportionalityactualsituation,failedto
6、considerthechangingofpracticalcoefficientofvoltageofmaintransformer,analysistheerrorsystem.Thispaperusesthepresenttwo-stagemethodofcausedbyavarietyofvariables.Theactualexamplesindicatethecalculatingtheloopcurrent,considerstheanglechangingalgorithmisn’tonlyeffectivebutalsosimpleandpractical,
7、betweenthedifferencemaintransformers,aimsattheclosedsatisfyingtherequestofprojectapplying,theproposedmodelloopoperationoftwofeedersinUrumqiarea,establishestheprovidesthetheoreticalsupportfortheschedulingmodelofclosedloop,calculatestheclosedloopcurrent,de
