地铁400 V开关柜断路器极数选择和中性导体接地方式分析

马德明（中铁第四勘察设计院集团有限公司，武汉市 430063）

Analysis of Poles Number Selection of Subway 400V Switch Cabinet Circuit Breaker

and Neutral Conductor Earthing Method

MA Deming（China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063，China）

Abstract：With regard to problems existing on poles number selection of incoming line and bus coupler circuit breaker 400 V switch cabinet，earthing method of neutral conductor in rail transit sector,as well as the investigation of the current situation of the industry design，this paper analyzes the reasons. Meanwhile，this paper analyzes the poles number selection and neutral conductor earthing method of 400 V switch cabinet according to the requirements of relevant specifications and the typical failure cases of subway engineering,and proposes the corresponding selection schemes and suggestions.

Key words：subway;power supply system;400 V switch cabinet;circuit breaker;selection of poles number;multi‑power system;neutral conductor;earthing method

摘　要：针对轨道交通行业400 V开关柜进线、母联断路器极数选择和中性导体接地方式存在的问题，以及行业设计现状的调研情况，分析其原因。结合相关规范要求和地铁工程典型故障案例，对400 V开关柜断路器的极数选择和中性导体接地方式进行分析，并提出相应选择方案和建议。

关键词：地铁；供电系统；400 V开关柜；断路器；极数选择；多电源系统；中性导体；接地方式

中图分类号：TU852      　　  　  文献标识码：A

doi：10.3969 / j. issn.1003 － 8493.2022.05.006