地铁直流牵引供电系统馈线保护方法研究

针对目前国内地铁直流馈线保护方法不是很成熟，本文介绍了地铁直流牵引供电系统中采用的几种直流馈线保护方法，详细分析了大电流脱扣保护。di／dt电流上升率及电流增量保护、过流保护、双边联跳保护、接触网热过负荷保护，自动重合闸保护的基本保护原理，并举例说明了如何通过对电流上升率，电流增量，和电流上升持续时间t的测量来区分故障情况和正常运行情况。为地铁馈线保护的配置提供了理论基础。

Research on Protection Method of Feeder Line in Subway DC Traction Supply System

At present, the protection methods for direct current feeder in subway are not very well The paper introduces several protection methods of direct current feeder protection adopted in traction power supply system, analyses the principle of high current tripping protection in detail, changing rate of current d i /d t and current increment protection, overcurrent protection, doubleend intertripping protection, OCS thermal overload protection and automatic reclosure It describes how to distinguish the abnormal and normal conditions by changing rate of current d i /d t with example, current increment and duration time of current increment It provides theory basis for the configuration of feeder protection in subway