基于相邻线路拓扑关系的距离保护测量回路隐藏故障诊断方法

Diagnostic method of measuring loop hidden failure of distance protection based on adjacent lines topological relations

针对距离保护装置测量回路的隐藏故障,提出了一种基于相邻线路网络拓扑关系的诊断方法。以故障持续时间内的线路拓扑关系为基础,分析了简单网络和带有分支线路网络中不同保护装置测量值之间的约束关系,并据此建立了用于诊断的判别式组及其相应的门槛值。通过对判别式组不同计算结果的组合,实现了对含有隐藏故障具体装置的定位。针对不同保护装置测量阻抗值不同步的问题,提出了采用故障稳态时刻测量值的处理方法。利用PSCAD/EMTDC对不同短路相角的故障情况进行了仿真验证,表明了采用故障稳态时刻的测量值能够正确识别出含有隐藏故障的装置。

To solve the distance protection measuring loop hidden failure problem, this paper proposes a diagnostic method based on adjacent lines topological relations. Aiming at simple network and network with branch lines, it analyzes measurement values constraint relations among different protection devices in the fault duration. Constraints discriminants and thresholds are deduced, by substituting measure impedance and composing the results, the purpose of positioning failure device can be achieved. According to the problem of protection measure impedance sync issue, it puts forward a processing method by using measure impedance on faults steady moment. PSCAD/EMTDC is used to simulate failure under different short-circuit phases, which proves device within hidden failure could be recognized by using measure impedance on faults steady moment.