10 kV树线故障树木暂态阻抗变化特性试验研究

Experimental research on transient impedance variationcharacteristics of 10 kV tree line faulted trees

为了研究输电线路树线故障暂态阻抗的变化特性,搭建10 kV树线故障试验研究平台,进行不同种类树木对输电线路引发树线接地故障影响试验研究。试验研究了松树和竹子不同含水率和不同树木长度对树线故障暂态阻抗的影响因素和变化特性,分析了树木内部结构对树木阻抗影响机制,建立了树木阻抗等效电路。研究结果表明:含水率是影响松树和竹子暂态阻抗的主要因素,含水率越大,树木暂态阻抗越小;长度对松树和竹子的暂态阻抗变化特性没有明显关系;树木的内部结构不同,会导致树木的暂态阻抗特性不同;建立的等效电路可以较好地解释树木暂态阻抗的等效电阻与变化特性不同的原因。

In order to study and analyze the change characteristics of the transient impedance of the transmission line tree line fault,a 10kV tree line fault test research platform was built to conduct experimental research on the influence of different types of trees on the tree line grounding fault caused by the transmission line.The influence factors and variation characteristics of different tree lengths on tree line fault transient impedance,the influence mechanism of tree internal structure on tree impedance was analyzed,and the tree impedance equivalent circuit was established.The research results show that the moisture content factor is the most important factor affecting the transient impedance of pine and bamboo,which leads to different transient impedance characteristics of trees;the established equivalent circuit can better explain the reasons for the difference and changing characteristics of the equivalent resistance of transient impedance of trees.