一起发电厂直流系统接地故障的查找及处理.pdf

2电工电气(205 No.)一起发电厂直流系统接地故障的查找及处理作者简介:朱瑜龙(1985- ),男,助理工程师,大专,从事火电厂电气设备维护工作。摘要: 介绍了一起发电厂输煤 110 V 直流系统负极接地的故障。通过拉路法查出故障接地点,判断脱硫湿式球磨机 B 开关及 5C 皮带机开关控制回路存在接地点。由于是负极两点接地同时存在,对直流系统接地采用拉路法查找带来难度,分析了处理过程,更改拉路法方案,找出故障原因并提出改进措施,为用拉路法查找直流系统短接地提供了参考。关键词: 直流系统接地;拉路法;两点接地中图分类号:TM645 文献标识码:B 文章编号:1007-3175(2015)01-0032-02朱瑜龙(天津蓝巢电力检修有限公司,天津 300380)ZHU Yu-long(Tianjin Launch Electric Power Maintenance Co., Ltd, Tianjin 0080, China)Abstract: Introduction was made to a power failure of 110 V DC system negative electrode grounding in the process of transporting coalin power plant. There existed grounding points in the control circuits of desulfurized wet ball mill B and 5C belt machine switches. Faultgrounding points were found by the pulling path method. Because two negative electrode grounding points existed at the same time, it wasnot easy for the pulling path method to search grounding points in the DC system. This paper analyzed the process carefully and adopted thepulling path method to find the fault reasons, raising some improved measures, which provides references for searching grounding points inthe DC words: DC system grounding; pulling path method; two points groundingSearch and Process of a DC System Grounding Fault in Power Plant0 引言发电厂的直流系统,对于机组的安全运行有着至关重要的作用。应保证在任何情况下都能可靠地向负荷供电。随着发电机组单机容量增大,直流系统的负荷也不断增加,使系统日趋庞大、复杂,对其供电质量的要求也越来越高。如何保证直流系统安全运行也变得非常重要。下面就以一起发电厂输煤110 V直流系统接