摘要
在对220 kV母线T区充电操作中,为防止母差保护大差后备功能误动作切除运行母线或运行支路,需要采取相应的风险防控措施。通过分析国内主流厂家多个型号的母差保护大差后备逻辑,针对不同保护型号和不同工况,提出了缩短对侧后备保护延时、强制模拟盘刀闸位置和短接母差保护对应充电间隔电流互感器(Current Transformer,CT)回路等措施。同时考虑到主变间隔与线路间隔对T区充电时的区别,提出了主变后备保护定值和跳闸矩阵的修改建议。现场实际运行案例证明了所提一、二次应对措施的有效性。
When charging the 220 kV busbar T area from other side substation through the transmission line, some type of busbar protection may mis-trip the operating busbar and lines because of the large differential relay＇s backup function. In order to prevent this risk, solutions should be taken. The different logics of the majority of busbar protections are analyzed. Several solutions are proposed, such as setting the switch simulation device manually, shortening the operation time of the backup protections, and shortening the CT from the charging equipment to the busbar protection. Considering the differences between the transform T area and this transmission line T area, this paper proposes the method to reset the transformer backup protection setting values. The above solutions to primary and secondary problems are verified by a practical operation case.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2017年第16期157-162,共6页
Power System Protection and Control
基金
广东电网公司科技项目(GDKJXM20162446)
2017年中国电机工程学会青年人才托举工程资助
关键词
母线T区
大差后备
线路间隔
主变间隔
母线保护
误动
busbar T area
large area differential backup protection
line T area
transformer T area
bus bar protection
malfunction
