基于行波电流暂态特性的输电线路故障原因辨识

The Identification of the Fault Cause of Overhead Transmission Lines Based on the Transient Characteristics of Travelling Wave Current

为了降低线路跳闸率有必要进行输电线路故障原因辨识。通过对输电线路雷击和非雷击故障行波电流的电磁暂态特征进行研究,提出利用波尾时间差异作为判断条件来进行雷击和非雷击故障辨识的方法;同时,针对故障行波的衰减和畸变,提出以分布式监测技术监测暂态行波电流,以实现输电线路故障原因的准确辨识。

In order to decrease the trip-out rate of the transmission line, it is necessary to do research of its fault cause identify. Throuth analyzing the electromagnetic transient characteristice of travelling wave current in the cases of lightning strike and non-lightning strike, this paper proposes an identification method for the two cases based on their virtual tail times difference. In addition, aiming at the attenuation and distortion of travelling wave during the fault period, the paper proposes to monitor the transient travelling wave current with distributed monitoring technology so to make more accurate identification to the fault cause.