重载桥梁区段信号电缆防护牵引电流影响的改造措施

Improvement Measures for Protecting Signal Cables against Interference of Traction Current in Bridge Section in Heavy Haul Railways

由于重载铁路牵引电流增大,对轨旁信号电缆的干扰也趋于严重,尤其在桥梁区段,甚至出现电缆烧损的情况。在此背景下,首先对大秦线AT供电和贯通地线条件下的接地方案和特点进行概述,系统总结重载条件下信号电缆对牵引电流干扰进行防护的改造措施,包括消除可能引起电弧放电的电位差、对信号电缆和贯通地线进行物理隔离、必要条件下加设地网、对贯通地线进行断线检测、有效防止接触网闪络等现象、信号电缆双端接地宜改为单端接地等。

Railway signal cables along the track side will suffer severe electromagnetic interference with the increase of traction current in heavy haul railways, even they might be burned especially in bridge sections. In view of the situation, the paper briefly summarizes the feature of grounding scheme in Da-Qing railway under AT power supply mode and ground wire, and gives the improvement measures for protecting signal cables from interference of traction current such as reducing the potential difference that may cause arcing, isolating physically the signal cables and ground wire, installing additional ground mat if necessary, monitoring the status of ground wire, effectively avoiding the flashover from over-head contact line and adopting single-end grounding instead of double-end grounding.