直供方式下影响钢轨电位分布的因素研究

Research on the Factors Affecting the Rail Potential Distribution under the Direct Supply Mode

为了有效抑制钢轨电位升高,建立了铁路牵引供电系统仿真模型,利用铁路牵引供电系统仿真模型研究了影响钢轨电位分布的因素。结果表明:相同牵引电流作用下,最大钢轨电位随机车与牵引变电所距离的增大而增大;相邻吸上线间的间距增大,吸上线内的最大钢轨电位增大;在相邻两根吸上线的区间内,机车位于区间中心时钢轨电位最大。

If the traction current is increased,the rail-to-ground leakage will increase at the same time,which will increase the rail potential.Signal equipment near the rail and even the lives of workers will be threatened when the rail potential rises,especially It is a signal device connected to the track.When the potential of the rail is too high due to excessive leakage current,it is very likely to have malfunction or failure.The increase in the leakage of the rail to the ground will also corrode the insulating pad between the rail and the sleeper.,The insulation capacity between the rail and the sleeper is reduced,and the leakage current of the rail is further increased,which will cause abnormal traction return.The rail is the key path for the traction current to flow back to the traction substation.However,excessive rail current will cause the rail potential to rise.If the rail potential value cannot be controlled within a safe range,driving safety will be affected.Therefore,in order to restrain the rail potential from rising and ensure that the rail potential is within a safe range,it is urgent for researchers to develop effective technical measures and appropriate potential reduction schemes.Otherwise,the excessively high rail potential will cause safety hazards to the operation of the locomotive.