铁路站场牵引回流系统的回流特性研究

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1、铁路站场牵引回流系统的回流特性研究曹晓斌何方方南交通大学电气工程学院国家电网芜湖供电公司摘要：在一些大型站场中，存在回流不畅、钢轨电位过高等回流问题，当发生接触M对支柱短路时，上述问题更加严峻。为了研究大型站场中牵引冋流系统的冋流特性,需要针对列车正常运行和接触网对支柱短路两种状态进行研究，运用接地分析软件CDEGS搭建相应的仿真模型，并根据所建模型进行仿真分析。由仿真结果可知:无论列车正常运行还是发生接触网短路故障，站场中只有小部分吸上线工作,因此导致钢轨上有较高的牵引电流;在发牛.接触网对单独接地支

2、柱短路故障时，支柱周围存在地电位过高等安全问题。针对以上问题，提出在牵引变电站附近多架设两条吸上线、将站场两端的贯通地线与回流线相连和将单独接地支柱底端与两侧钢轨的扼流变中性点相连的措施。通过仿真分析，提出的措施方案能够较好地改善站场中存在的回流问题并解决短路故障带来的安全问题。关键词：回流系统;接触网支柱;短路;地电位;作者简介：曹晓斌（1974—），男，湖南衡阳人，副教授，博士。E-mail:caoxiaobin@163.com收稿日期：2015-10-17ResearchonReturnCurre

3、ntCharacteristicsofTractionReturnCurrentSysteminStationYardCAOXiaobinHEFangfangSchoolofElectricalEngineering,SouthwestJiaotongUniversity;StateGridWuhuElectricPowerSupplyCompany;Abstract：Insomelargestationyards，returncurrentproblemsexist,suchasobstructedt

4、ractionreturncurrentandhighrailpotential.ThisisparticularlythecasewhentheoverheadcontactsystemisshortcircuitedtoOCSpole.Inordertostudythereturncurrentcharacteristicsofthetractionreturncurrentsysteminlargestationyards，thegroundinganalysissoftwareCDEGSwasu

5、sedtobuildthecorrespondingsimulationmodelsaddressingtwoscenariosinvolvingthenormaloperationofthetrainandshortcircuitoftheOCStoOCSpole.Asimulationanalysiswascarriedoutaccordingtotheestablishedmodel.Basedonthesimulationresults,undereitherscenarioofthenorma

6、loperationofthetrainortheshortcircuitoftheOCStoOCSpole,onlyasmallnumberofboostingcableswork,whileotherboostingcableshardlywork,thusleadingtohightractioncurrentontherail.InthecaseofshortcircuitfaultoftheOCStothesoleOCSpole,thesafetyproblemofexcessivegroun

7、dpotentialaroundthepoleexists.Inresponsetotheaboveproblems,thefollowingmeasuresareproposed,includingerectionoftwomoreboostingcablesinthevicinityofthetractionsubstation,connectionofthegroundingwireatbothendsofthestationyardwiththereturnline,andconnectiono

8、fthebottomofthesoleOCSpolewiththeneutralpointofchoketransformerofbothrails.Throughthesimulationanalysis,themeasurescanimprovetheproblemsoftractionreturncurrentandthesafetyproblemofshortcircuit,andcanbewidelyusedinrailwayst