城市轨道交通专用轨回流系统框架泄漏保护分析

Analysis of Frame Leakage Protection of Special Rail Return System for Urban Rail Transit

介绍走行轨兼作回流轨系统中的框架泄漏保护,分析了框架泄漏保护适用的故障类型;对比走行轨回流系统,总结专用轨回流系统的主要变化,重点针对专用轨回流系统中不同接地故障的电流路径及保护措施进行分析,得出结论:专用轨回流系统中的框架泄漏保护只需设置电流元件而无需设置电压元件。

The paper introduces the frame leakage protection of the return system with the running rail served also as the return rail,analyzes the types of faults applicable to the frame leakage protection,summarizes the main changes of the special rail return system compared with the return current system of the running rail,analyzes the current paths and protection measures for different grounding faults highlighted with the special rail return system.The conclusions are obtained that the only the current components,but not the voltage components,are required to be set for the frame leakage protection in the special rail return system.