地铁轨道对地绝缘损坏时杂散电流变化规律研究

Study of Stray Current When Track to Earth Insulation Defect Occurrs

地铁轨道对地绝缘如果发生局部损坏 ,该处的轨道对地电位将接近于零 ,进而造成轨道对地电位最大值以及杂散电流的增加。如果损坏位置位于牵引所回流点附近 ,则轨道对地电位的最大值变为正常情况下的 2倍 ,杂散电流变为正常情况下的 4倍 。

When local defect of track to earth insulation occurs,the track to earth potential of the position will be changed to zero,which will increase the maximum value of track to earth potential as well as the stray current.If the defect occurs at the return point of track substation, the maximum value of track to earth potential will be doubled and the stray current will be fourfold.This paper discusses how to adopt a system to monitor the stray current when defect occurs.