适用于弱电强磁平行线路的序分量方向元件  

Directional Component Based on Sequence Component for Parallel Lines with Magnetically Strong and Electrically Weak Connection

作　　者：张琦兵 苏大威 徐春雷 彭志强 

机构地区：[1]国网江苏省电力公司,江苏南京210024 [2]国网江苏省电力公司电力科学研究院,江苏南京211103

出　　处：《江苏电机工程》2016年第6期42-44,49,共4页Jiangsu Electrical Engineering

摘　　要：针对于弱电强磁情况下平行线路相邻线接地故障时引起本线路零序方向元件误判的问题,分析了不同故障下各电压序分量的特点,基于不同的电压序分量,形成了零序方向元件。该方向元件根据不同故障类型,使用零序电压与正序电压合成方式作为比相参考电压。新提出的零序方向元件在弱电强磁的平行线路系统中能正确判别故障方向,防止纵联零序方向保护的误动,PSCAD仿真验证了该方向元件的有效性。The zero sequence directional component gives the wrong judgment when ground faults occur on the other line of the parallel transmission lines with magnetically strong and electrically weak connection. Focused on the problem, the characteristics of voltage sequence components under different faults are analyzed. Based on different voltage sequence components, a new zero sequence directional component is proposed in this article. Considering the different types of faults, the new zero sequence directional component takes the synthetic value of zero sequence voltage and positive sequence voltage as the reference voltage of phase comparison. The new proposed zero sequence directional component can distinguish the fault direction correctly for parallel transmission lines with magnetically strong and electrically weak connection, preventing the unwanted operation of the pilot zero sequence directional protection. The simulation by PSCAD verifies the effectiveness of the new directional component.

关 键 词：弱电强磁 平行线路 方向元件 

分 类 号：TM773[电气工程—电力系统及自动化]