摘要
同杆并架带弱馈线路逐步在电力系统中出现,这种系统中故障特征较之常规系统有所区别。文章提出新的跨线故障模型,采用六序分量法分析同杆并架带弱馈线路在发生跨线故障时过渡电阻对差动保护的影响,得出:在靠近弱馈侧发生跨线故障,跨线相之间的过渡电阻会影响差动保护的动作行为,甚至有可能导致差动保护拒动,从而使得该线失去速动保护。综合双回线考虑,继电保护可实现纵续动作。文章并建立了RTDS试验模型,仿真结果与理论一致。
Double-cuicuit transmission line with weak infeed is used in power system.The fault characteristics are different from the comventional line.This paper presents new cross-line fault model,analyses the character of the fault between two same lines on double-cuicuit transmission line and the influence on differential protection with six-sequence component.Cross-line fault occurs in the near weak feed-side,the transition resitance between fault phase will affect the behavior of differential protection,and even may lead to differential protection refusing.Relay of the double-cuicuit transmission line can fastly act successively.RTDS simulation shows that the result accords with the theory.
出处
《价值工程》
2010年第16期114-115,共2页
Value Engineering
关键词
同杆并架
弱馈
线路保护
double-curcuit transmission line
weak infeed
transmission protection
