输电线路树木故障机理分析及试验研究

Mechanism Analysis and Experimental study of Transmission Line Tree-related Failures

树木故障是输电线路一种非常典型的非雷击故障。目前已有的研究多针对树木故障的诊断及处置,而关于树木故障的机理研究却比较少见。文章首先从理论上分析了树木故障的形成过程,以及在不同高度树木高度阶段呈现出的典型放电特征,然后在实验室环境下模拟了不同高度阶段树木-导线间隙放电过程。对放电电流进行监测,结合波形特征、频谱特征分析,给出了不同高度阶段树木放电的特征和规律,对输电线路树木故障形成机理做了进一步阐述。

Tree-related failure is a typical non lightning fault on transmission lines.Current researches mainly focus on the diagnosis and treatment,while the mechanism study is seldom reported.Firstly,the formation process of tree-related failure and the typical discharge characteristics in different stages of tree height are analyzed,and then different phases of tree-wire gap discharge process are simulated in the lab environment.The discharge current is monitored,and the characteristics of the waveform and the frequency spectrum are analyzed.Characteristics and rules of tree-wire discharge at different stages are obtained,and the mechanism of transmission line tree-related failures is further expounded.