同杆双回线上零序功率方向继电器的误判问题

WRONG JUDGEMENT OF ZERO SEQUENCE DIRECTIONAL RELAY ON DOUBLE-CIRCUIT LINE ON THE SAME POLE

零序功率方向继电器是线路保护中的一个重要元件。文中用六序分量法分析了同杆双回线上零序功率方向继电器的性能。结果表明 ,在同杆双回线上发生三相三导线及三相四导线故障、三相五导线跨线故障时 ,有一回线的零序功率方向会拒动。动模试验证实了理论分析的结果。

The zero sequence directional relay is an important relay component for transmission line. Based on the method of six sequence fault component, this paper analyses the performance of zero sequence directional relay on double circuit line on the same pole (DLSP). The result shows that faults, including three phases for three conductors or three phases for four conductors or three phases for five conductors faults, will be wrongly judged as the reverse faults by the zero sequence directional relay on one single circuit line of the DLSP. The dynamic simulation results prove the conclusion.