摘要
反向经分支支路故障对距离保护的影响以前未能引起关注,文中结合实用的四边形继电器特性对这种故障情况进行了系统的分析,得到这种故障条件下测量阻抗和方向阻抗的变化轨迹及其特性,提出了方向特性门槛的参数的参考选择范围,发现了现有的四边形特性方向距离保护在反向经分支支路故障时有误动的可能。
Impedance between faulted line and ground is generally regarded as a resistance, but in some cases the equivalent impedance can be reactive. Fault on a transmission line connected to the bus behind the protection is equal to fault on the bus through a reactive ＂fault impedance＂. This problem has rarely been noticed. The impedance loci with fault impedance seen by the protection in this condition is analyzed. The theoretical analysis and digital simulation results show the possibility that distance protection with quadrangular characteristic may real-operate under this condition.
出处
《电力系统自动化》
EI
CSCD
北大核心
2006年第21期66-70,共5页
Automation of Electric Power Systems
关键词
距离保护
过渡电阻
电力系统
distance protection
fault resistance
power systems
