地铁直流牵引供电系统杂散电流分析

Analysis of Stray Current in Metro DC Traction power System

从离散模型出发,利用有限元分析法对地铁直流牵引供电系统的接触电压及杂散电流进行了分析。分析结果表明,结构钢电阻率对接触电压和杂散电流影响不大,而钢轨电阻率、过渡电阻、机车电流以及供电区间长度等参数均对接触电压和杂散电流有明显影响。地铁杂散电流防护工程中,关键在于前期对源头的控制,如加强轨道对结构钢的绝缘,合理设计结构钢筋的截面积等。地铁建成后,应重视杂散电流的监测与防护的功能。即“注重维护,加强监测”的防治原则。

This paper analyses the rail potential and stray current in metro DC traction power system. The fact shows that the specific resistance of concrete steel has little influence upon the touch potential and stray current, while the specific resistance of rail, the rail-ground transition resistance, the train current and the distance between the transformer substations have greater influence upon them. At last, the method to prevent stray current and the principle of ＂better maintenance and more monitors＂ are introduced.