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城市轨道交通普遍采用直流牵引供电方式,牵引电流由正母线经接触网流至机车,回流电流由机车经走行轨回流至牵引变电所负极。为减少杂散电流泄漏问题带来的影响,钢轨与地之间需要绝缘。实际运行的线路中,普遍存在轨地绝缘值较低的问题。本文为研究轨地过渡电阻变化时回流系统的轨道电压,轨道电流及杂散电流的变化情况,建立了回流系统仿真模型。通过仿真分析了轨地过渡电阻变化与回流系统其他参数变化的非线性,为地铁运营及维护提供理论依据。
Urban rail transit generally adopts the DC traction power supply mode. The traction current flows from the positive busbar to the locomotive via the contact net, and the return current flows back to the negative pole of the traction substation from the locomotive via the traveling rail. To reduce the effects of stray current leakage problems, insulation between rails and ground is required. The actual operation of the line, the prevalence of lower insulation value of the problem. In order to study the variation of orbital voltage, orbital current and stray current of the backflow system during the transition of rail transit resistance, a simulation model of the backflow system was established. The nonlinearity of the change of the transition resistance between rail and ground and other parameters of the return system was analyzed by simulation, which provided a theoretical basis for the operation and maintenance of the subway.