地铁直流框架泄漏保护设置方案分析

Scheme Analysis of Metro DC Frame Leakage Protection

研究目的:直流框架泄漏故障是供电系统中一种影响较大的故障,一旦发生,将引起大范围停电,影响列车的正常运行。缩小框架泄漏保护故障影响的范围,迅速、准确查找故障,对于缩短接触网停电时间、尽快恢复供电意义重大。为此,本文研究分析目前框架泄漏保护主要的三种配置方案,以推出性价比最优的配置方案。研究结论:推荐设两套框架泄漏保护装置的方案,即整流器与负极柜用一套,直流开关柜用一套。此方案缩小了故障影响范围,缩短了停电时间,提高了直流供电系统的可靠性,性价比最优,可在工程实施中进行推广。另外,工程设计中,建议两套框架保护装置方案与直流进线采用断路器方案相结合,效果更好。

Research purposes： The DC frame leakage fault is the fault that can cause the big influence on the power supply system. Once this fault occurs, it will cause the large - scale power cut, and affect the normal running of the train. So reducing the scale influenced by the frame leakage fault and finding out the fault position rapidly and exactly are very crucial to shortening the power cut time and recovering the power supply as soon as possible. This paper researches and analyzes the three main schemes for frame leakage protection for getting the best cost performance scheme. Research conclusions ：The scheme of installing two sets of frame leakage protection devices is recommended. Namely, one set is for rectifiers and negative pole cabinet and the other one is for DC switchgears. With this scheme, the scale influenced by the fault can be reduced, the power cut time can be shortened, the reliability of the DC power supply system can be enhanced and the best cost performance can be obtained. So this scheme can be widely used in the projects. In addition, it is proposed it will be better to use this scheme along with the scheme of adopting the breaker in the DC incoming switchgear.