摘要
发电机失磁和失步保护都运用故障时的阻抗变化轨迹特性作为阻抗判据,因而两者的动作阻抗区域可能会有部分重叠,造成失磁和失步保护的逻辑运算冲突。文中提出通过修正阻抗圆或增加方向闭锁判据来解决失磁和失步保护在阻抗坐标平面第三象限可能会发生冲突的问题,具体做法是削去失磁阻抗的左半圆或者在阻抗坐标平面第三象限通过判断阻抗变化方向来防止失磁保护在失步故障时抢动。
Both loss-of-excitation protection and out-of-step protection are based on the impedance changing track during the faulty period. However, in some cases, the areas for the loss-of-excitation protection and out-of-step protection may overlap and therefore cause logic conflicts between the two protections. This paper presents two solutions to solve the conflict, either by deleting the left handed half circle or monitoring the impedance directions in the third quadrant of impedance coordinate plane. They are effective in preventing loss-of-excitation protection from action on any out-of-step fault.
出处
《电力系统自动化》
EI
CSCD
北大核心
2007年第17期61-64,共4页
Automation of Electric Power Systems
关键词
失磁保护
失步保护
阻抗动作特性
冲突
协调
loss-of-excitation protection
out-of-step protection
impedance operation characteristic
conflict
coordination
