近些年来,各路局电气化牵引区段过桥及室内位置多次发生牵引回流引发信号电缆大面积烧损故障,而且一根电缆烧损往往波及10余根相邻电缆,故障延时很长,对行车造成严重影响。虽然各铁路局都做了大量分析,有的安排了初 In recent years, the various sections of the electrification traction section across the bridge and indoor position several times lead to return traction induced large-scale signal cable burning failure, and a cable loss often spread to more than 10 adjacent cables, the delay is very long , Have a serious impact on driving. Although all railway administrations have done a lot of analysis, some have arranged for the beginning