浅谈发电机主开关二次接线回路改进  

Improvement of the Generator Main Switch's Secondary Wire Circuit

作　　者：庄朋 

机构地区：[1]国电电力发展股份有限公司邯郸热电厂,河北邯郸056004

出　　处：《华北电力技术》2016年第4期38-42,共5页North China Electric Power

摘　　要：某发电厂曾经发生两次机组跳闸事件,第一次锅炉MFT动作,12号机停机锅炉灭火;第二次低励失磁保护动作,12号机停机。两次事故均由于同一直流空气开关的直流电源消失而引起。文章结合这两次事故,分析了事故的原因,发现了发电机主开关二次接线回路在设计上存在的缺陷,并提出了最佳的改进方案。Two unit shutdown accidents had happened in a power plant. The first one was because of the trip of boil- er＇ s MFT and the followed fire blackout. The second was because of the trip of underexcitation protection. The two accidents were all caused by DC lost in grid control building. This paper analyzed the reason of the accidents, discov- ered the design drawback of circuit breaker, and provided the best way to solve the problem.

关 键 词：机组跳闸 直流电源消失 MFT动作 低励失磁保护动作 动作分析 

分 类 号：TM645.2[电气工程—电力系统及自动化] TK323[动力工程及工程热物理—热能工程]