输电线路树闪故障分析  

Research on Tree Flash Failure Analysis for Transmission Line

作　　者：高腾 宋福根[1] ZHANG Lin-lin GAO Teng;SONG Fu-gen(College of Electrical Engineerineg and Automation,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福州大学电气工程与自动化学院,福建福州350000

出　　处：《电气开关》2023年第3期24-27,共4页Electric Switchgear

摘　　要：输电线路在野外常常出现输电线路下方存在森林的情况随着树木生长,树木和输电导线之间距离很可能会小于安全距离,此时就容易发生电晕甚至闪络,因此针对临近输电导线电场强度分析十分需要。本文通过建立仿真模型分析讨论了正常运行时树木高度、所处位置、地形以及线路发生接地故障等对输电线路临近导线附近电场的影响。发现最有可能发生闪络的点在三相输电线路正下方且随着输电线下方树木不断生长架空输电线附近场强急剧增加;在线路发生接地故障时输电线附近场强相比正常运行时场强畸变较大但就场强值而言有所削弱并不会增加发生闪络的风险,这些为后续检修发现线路隐患提供参考。Transmission lines often appear in the field under the transmission line there is a forest situation with the growth of trees,trees and the distance between the transmission line is likely to be less than the safe distance,at this time prone to corona and even flashover,so it is very necessary to analyze the electric field strength of the adjacent transmission line.In this paper,a simulation model is established to analyze and discuss the influence of tree height,location,terrain and ground fault on the electric field near the transmission line during normal operation.It is found that the most likely flashover point is directly below the three-phase transmission line and the field intensity near the overhead transmission line increases sharply with the continuous growth of trees below the transmission line.In case of ground fault,the field strength near the transmission line has a larger distortion than that in normal operation,but in terms of the field strength value,it will not increase the risk of flashover,which provides reference for the follow-up maintenance to find the hidden trouble of the line.

关 键 词：输电线路 树木 电场分布 仿真分析 

分 类 号：TM72[电气工程—电力系统及自动化]