利用"六角图"判别功率方向继电器接线的正确性

为确保功率方向继电器在输电线路正方向发生故障时能够可靠灵敏地动作而在反方向故障时不动作,在已知功率方向继电器动作特性的基础上,有必要对其接线以及输电线路中的电压与电流的相位关系进行实测与检验.本文介绍了用瓦特表测量法测绘"六角图"(向量投影图)进而检验功率方向继电器接线的原理、方法及判断依据,并在实验室进行了方向电流保护动作正确性检验的动态模拟实验,其结果证实了所提方法的正确性和有效性.

Judging the Correctness of Power Directional Relays' Connection by Using "Hexangular Diagram"

It's necessary to measure and verify the connection of power directional relays and the phase relation between the voltage and the current in transmission line based on some certain characteristics of it in order to assure the reliable and sensitive action in case the fault situation is positive direction and vice versa. The measure method of utilizing a watt meter to map "hexangular diagram" (the diagram of phasors' projection) is presented in this paper. The principle, method and judgement criterion to testify the connection of power directional relays are cited too. The dynamic experiment on the verification of directional current protective relaying is simulated in our laboratory. And the validity and the correctness are proved by the experiment results.