摘要
介绍了某变电站220 kV线路11型微机保护在系统出现小扰动后发生误动事故的概况。通过分析误动保护的故障报告及软件流程,并结合现场模拟实验,指出了保护误动的原因是由于拨轮开关接触不良,造成定值跑区而使高频保护方式从闭锁式变为允许式造成的。结合本次事故发现的问题,提出了相应的整改措施,以避免相同事故的再次发生。
A mishandling fault of 11 type microcomputer-based protection of 220 kV line is introduced.Through analyzing the fault report and the software process of misoperation protection,and combining with the simulation experiment,the reason of misoperation protection is pointed out that the contact of thumbwheel is not good which causes fixed set-point not be within the zone and makes the way of high frequency protection from enclosed type to permissive type.In connection with the problems found in the fault,the corresponding rectification measures are proposed to avoid this fault.
出处
《四川电力技术》
2011年第3期45-47,共3页
Sichuan Electric Power Technology
关键词
误动
高频保护
定值区
微机保护
拨轮
misoperation
high-frequency protection
fixed set-point zone
microcomputer-based protection
thumbwheel
