摘要
输电线路走廊内往往生长有高大树木。当树木与输电导线距离过于接近时,树木顶端容易产生放电,造成树木烧蚀,甚至引发火灾,此外,也极容易引起线路跳闸。为保护树木并减少输电线路跳闸故障的发生,有必要对树木临近输电导线时电场分布及变化规律进行研究。论文分析了树木参数对电场分析与建模的影响,以此为基础,建立了实际110kV输电线路树木临近三维仿真模型,分析了不同类型树木、不同高度树木等多种因素对空间电场分布的影响,找到了树木临近过程中电场变化规律。以流注起始场强作为间隙临界击穿的判据,分析了不同电源相角下临界击穿距离,结论表明,为避免树木闪络故障发生,树木与导线距离应大于0.42m。
There are often tall trees in the corridors of transmission lines.When the distance between trees and transmission lines is too close,corona discharges are prone to occur at the top of trees,which further causes tree ablation and even fire.In addi⁃tion,it is also very easy to cause line tripping.In order to protect trees and reduce trip faults of transmission lines,it is necessary to study the distribution and variation of electric field when trees are near transmission lines.Firstly,this paper analyses the influence of tree parameters on electric field analysis and modeling.On this basis,a three-dimensional simulation model of tree proximity for 110kV transmission lines is established.The effects of different types of trees and trees of different heights on spatial electric field distribution are analyzed,and the law of electric field variation in the process of tree proximity is found.Taking the starting field strength of the flow as the criterion of the critical breakdown of the gap,the critical breakdown distance under different power supply phase angles is analyzed.Result shows that the distance between the tree and the wire should be greater than 0.42m in order to avoid the occurrence of tree flashover failure.
作者
赵海龙
黄松
ZHAO Hailong;HUANG Song(Electric Power Research Institute,Hainan Power Grid Co.,Ltd.,Haikou 570100)
出处
《计算机与数字工程》
2020年第8期2057-2063,共7页
Computer & Digital Engineering
关键词
树木
跳闸
烧蚀
三维仿真模型
电场分布
tree
fault
ablation
3D simulation model
electric field distribution
