单母线分段400 V开关柜接地保护方案的优化  

Optimization of grounding protection scheme for single bus section 400 V switchgear

作　　者：马德明[1] 刘胜林 Ma Deming;Liu Shenglin

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉430063 [2]长沙市轨道交通集团有限公司,湖南长沙410133

出　　处：《电力系统装备》2020年第3期70-71,共2页Electric Power System Equipment

摘　　要：单母线分段接线下的400 V开关柜采用三极进线断路器方案时,应满足N排单点接地的要求,使得400 V进线框架断路器剩余电流保护设置定值需要降低灵敏度,以保证运行安全。本文提出了一种基于400 V框架断路器的通信模块,通过N-PE排电流测量值触发,两个进线框架断路器通信比差,进行选择性确认,以提高接地保护灵敏性的方案。When a 400 V switchgear adopts a three-pole incoming circuit breaker scheme under single-bus section wiring,it should meet the requirements of N-row single-point grounding,so that the setting value of the residual current protection setting of the 400 V incoming frame circuit breaker needs to reduce sensitivity to ensure Operational safety.This paper proposes a communication module based on a 400 V frame circuit breaker,which is triggered by the N-PE discharge current measurement value.The communication ratio of the two incoming frame circuit breakers is poor,and selective confi rmation is performed to improve the sensitivity of ground protection.

关 键 词：单母线分段 TN-C-S、400 V 三极断路器 接地保护 

分 类 号：TM76[电气工程—电力系统及自动化]