摘要
针对同塔双回或多回并架输电线路给接地距离保护带来的新问题,通过分析同塔线路在并列运行、一端分裂运行、两端分裂运行等不同结构,两端系统发生强弱变化以及在不同接线结构和运行方式下线路发生故障时接地距离保护的测量阻抗,得出了同塔双回线路对接地距离保护影响的基本规律,即平行线路零序电流影响故障线路保护测量阻抗的规律,并证明该规律可以指导同塔线路接地距离保护的整定计算及安全性评价。
The increase of double/multi-circuit transmission lines brings new problems on grounding distance protection.Upon analyzing measured impedance of grounding distance protection during faults of double/multi-circuit transmission lines with different power network structures and operating modes,the basic rule about influence of parallel-line zero-sequence current on measured impedance of protection during line faults is proposed,which has important significance for setting coordination and safety analysis about grounding distance protection applied in double/multi-circuit transmission lines.
出处
《广东电力》
2010年第10期24-28,79,共6页
Guangdong Electric Power
关键词
同塔线路
距离保护
测量阻抗
安全性
double/multi-circuit transmission line
distance protection
measured impedance
safety
