基于故障分量正序电抗的方向元件  

Directional Element Based on Fault Component Positive Sequence Reactance

作　　者：刘凯[1,2] 李小滨[2] 索南加乐[1] 刘荣[2] 夏经德[1] 

机构地区：[1]西安交通大学电气工程学院,陕西省西安市710049 [2]烟台东方电子信息产业股份有限公司,山东省烟台市264001

出　　处：《电力系统自动化》2009年第12期67-70,90,共5页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(50677051)~~

摘　　要：提出了基于故障分量正序电抗的方向元件。当线路上发生正向故障时,故障分量正序电抗等于背侧的系统电抗,极性为负,小于线路正序电抗;当线路上发生反向故障时,故障分量正序电抗等于线路和对侧系统的正序电抗之和,大于线路电抗。根据这个特点,可以判断故障方向。该方向元件易于实现,灵敏度高,不需要设置电压门槛,即使感受到的故障分量正序电压的幅值较小,仍可以准确地判别方向。A new directional element based on the fault component positive sequence reactance （FCPSR） is presented. When forward fault occurs, FCPSR is equal to the system reactance at the back side, and its sign is negative, also less than the line positive sequence reactance. And when reverse fault occurs, FCPSR is equal to the sum of the line reactance and positive sequence reactance of the system at the remote side, it is larger than the line reactance. The fault direction thus can be distinguished with such feature. The direction element based on FCPSR has high sensitivity and not needs to be set voltage threshold, even when the fault component positive sequence voltage is very low or close to zero. The direction element can work well.

关 键 词：故障分量正序电抗 方向元件 电压门槛 

分 类 号：TM773[电气工程—电力系统及自动化]