绝缘局部损坏下地铁杂散电流分析

Analysis of Stray Current under the Partial Insulation Failure in Metro

简述杂散电流产生机理,建立均匀电阻下杂散电流分布的数学模型,分析杂散电流的分布规律。地铁运行多年后,走行轨对地可能发生绝缘损坏,走行轨纵向电阻值和走行轨对地过渡电阻值可能发生变化,运用Matlab软件进行仿真,仿真结果显示在绝缘局部损坏下,绝缘损坏处杂散电流将显著增大。

The paper describe the mechanism of generation of stray current, build the mathematical model of the stray current＇s distribution under even state, and analysis the law of stray current＇s distribution. After many years＇ running, the insulation of metro＇s running rails to earth may be broken. The longitudinal resistance of running rails and the transition resistance of running rails to earth may change. We can use MATLAB to simulate, and analysis the law of stray current＇s distribution in these conditions, The simulation results show that the stray current will increase significantly in the insulation place under uneven state.