北京地铁房山线列车接地系统在实际应用中的问题及解决措施

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ProblemsofTrainEarthingSystemofBeijingMetroFangshan LineinPracticalAplicationandSolutions

WANGXiaotong

（OperationBranch2ofBeijingMetroOperationCo.，Ltd.，Beijing，China）

Abstract：TheBJD01trainsofBeijingMetroFangshanLinepresenttheproblemofelectrolyticcorosion of axle box bearings in large quantities in the actual operation. In course of troubleshoting， the static and dynamiccurentsoftheearthingcircuitweremeasuredandanalyzedtofinalyconfirmthattheelectrolytic corosionofaxleboxbearingshadbencausedbyincompatiblewiringofthetrainearthingcircuitwhichledto theunbalancedreturningcurentdistributionoftheearthing.Withtheincreaseoftrainloadandoperation sped，theunbalancedreturningcurentdistributionwilbecomemoreobvious.Acordingtothereturning curenttestonthesite，theactualcurenthasexcededthemaximumdesigncurentvalueforasingleaxle. Thisarticleproposesthre solutions：instalingearthingcurentreturningdevicesonthetrailercars; modifyingthewiringofearthingcircuitofthemotorcar;instalingearthingsystemprotectionresistorsor separatingtheoperationearthingfromtheprotectionearthing.Italsoexpoundsthethresolutionsrespectively fromtheangleoftrainoperation.Throughthecostanalysisandthetrainloaddistributionanalysis，it'sfinaly determinedthatthesolutionofmodifyingthewiringofearthingcircuitofthemotorcarcompliesmorewith theon-siteconditions.Theimplementationofthissolutionhasefectivelysolvedtheproblemofelectrolytic corosionoftrainbearingsofFangshanLine.

Keywords：metrovehicle;operationearthing;protectionearthing;earthingcircuit;electrolyticcorosion ofbearings

地铁房山线列车在40万 km 修程中，发现大量轴箱轴承出现电蚀情况，在对全部列车进行普查过程中，发现均存在不同程度的轴承电蚀情况，影响列车的安全性能，现对列车轴箱轴承电蚀原因进行分析，并提出解决措施。（剩余4866字）