一起线路故障纵联方向保护拒动的分析及改进方案

Analysis and improving schemes of direction pilot protection rejecting movement in a line fault

针对一条线路连续发生2次同一点区内高阻接地故障,纵联保护未动作的问题,详细介绍和分析了纵联方向元件的动作方程、逻辑,得出了由于突变量方向元件误判反方向导致整套纵联保护拒动;进一步分析突变量方向动作条件及实现方法,得出由于故障后电压故障分量小,导致方向误判的结论。依据分析结论提出相应的解决方案,并通过现场数据进行了可行性验证。

Aim at the problem of the high resistance grounding fault in twice Occurring same point inside area of a line, the pilot protection rejecting movement, introduces and analyzes the action equation and the logic of the pilot protection direction element, puts forward corresponding solutions.