基于雷击故障辨识的110 kV输电线路故障巡线策略

Fault patrol strategy for 110 kV transmission line based on the lightning fault identification

雷击是造成输电线路故障的最主要因素之一,为了减轻频繁雷击故障带来的繁重巡检任务,该文提出一种基于雷击故障辨识的巡线策略。首先,测试常用类型绝缘子受雷击冲击后的耐压特性,发现雷击后绝缘子具有无明显下降的绝缘性能特征,为巡线策略的可行性提供试验基础;然后,基于故障行波时域和频域的波形特征,研究线路雷击故障类型的辨识方法;最后,结合试验和理论研究验证该文所提方法的可行性。在湖南某110kV输电线路故障后,利用该文所述方法确定该线路为瞬时性雷击故障,无需巡线,有效降低了巡线成本。该文所提巡线策略可在保证供电可靠性的同时,有效减少巡检工作量,为输电线路运维工作提供基础数据和方法指导。

Lightning strike is one of the most important factors causing faults in transmission lines. In order to alleviate the heavy inspection tasks caused by frequent lightning strikes, the paper proposes a patrol strategy based on the lightning fault identification. Firstly, the voltage withstand characteristics of common types of insulators after lightning strikes are tested. It is found that the insulation characteristics of insulators don’t drop significantly after lightning strikes, which provided a test basis for the feasibility of the inspection strategy. Then, the identification method of line lightning strike fault is obtained through the research on waveform characteristics of the time domain and frequency domain for the fault traveling wave. Finally, the feasibility of proposed method is verified by combining the experimental and theoretical research. A example of breakdown for a 110 kV transmission line in Hunan is simulated to verify this method. The cost of the inspection line is effectively reduced since it is no need to patrol the line to determine if the line has a transient lightning strike fault.The proposed patrol strategy not only effectively reduce the workload of inspection but also ensure the reliability of power supply.It provides basic data and method guidance for the operation and maintenance of transmission lines.