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191问答库 > 地铁供电系统引起直流偏磁的原理是什么？

地铁供电系统引起直流偏磁的原理是什么？

2025-03-15 14:09:09

推荐回答（1个）

回答1：

　　地铁供电系统采用直流供电方式，一般为DC750V或1500V。分为单边供电系统和双边供电系统
　　由于机车下走行轨与地不是完全绝缘，部分直流分量将流入大地。这部分电流专业上叫做杂散电流。
　　由于入地杂散电流的作用，会在牵引站附近产生地电位分布。与直流输电接地极类似。倘若此时，具有交流连接的两台接地主变位于不同地电位，将产生一定的偏磁电流。

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