近年来铁路先后发生多起信号电缆大面积烧损的事件,究其原因,主要是由于外部磁场的影响较大、电缆的接地方法不合理。对由外部磁场干扰而产生感应电流、电压的原理进行分析,并探讨电缆接地的方法,提出电缆接地的优化方案和防电缆烧损的措施,为工程实施和维护管理提出可行性建议。 In recent years, there have been a large number of railroad signal cable burning event, the reason is mainly due to the larger impact of the external magnetic field, the cable grounding method is not reasonable. The principle of induced current and voltage induced by external magnetic field is analyzed. The method of grounding the cable is also discussed. The optimal scheme of cable grounding and the measures to prevent the cable from burning out are put forward. The feasible suggestions are put forward for project implementation and maintenance management.