城轨交流牵引供电系统钢轨电位分析与治理

Analysis and Treatment of Rail Potential of Urban Rail AC Traction Power Supply System

在已有城轨交流牵引供电系统研究基础上,针对该系统的独有电缆牵引网结构特点,推导了城轨交流牵引供电系统分布钢轨电位表达式,搭建仿真模型,仿真分析各种工况下的钢轨电位,发现新系统钢轨电位过高的问题。为了使城轨交流牵引供电系统远期高峰工况钢轨电位不超过相关标准规定,借鉴现有电气化铁路钢轨电位的治理思路,提出了新系统在牵引所设置集中接地极、增设贯通地线、上下行钢轨横联、并联回流线等措施并逐步进行仿真分析,根据仿真结果提出新系统钢轨电位治理的综合措施,最后验证了该综合措施可有效治理新系统的钢轨电位。

Based on the research of the existing urban rail AC traction power supply system,according to the unique structural characteristics of the cable traction network of the system,the expression of the rail potential of the urban rail AC traction power supply system is derived,and a simulation model is built to simulate and analyze the rail potentials under various working conditions.It is found that the rail potential of the new system is too high.In order to make the rail potential of the urban rail AC traction power supply system in the long-term peak working condition not exceed the relevant standards,drawing on the existing rail potential treatment ideas of the electrified railway,measures are proposed for the new system,such as setting a centralized ground electrode in the traction station,adding a through ground wire,lateral combination for the upper and lower rails,and parallel return lines.These measures are simulated and analyzed step by step.Based on the simulation results,the comprehensive measures for the rail potential treatment of the new system are proposed.The simulation proves that the measures effectively suppresses the rail potential of the new system.