架空输电线路走廊树木临近导线放电机理及试验研究  

Study on Discharge Mechanism and Test of Tree Adjacent Conductor in Overhead Transmission Line Corridor

作　　者：曾华荣 毛先胤 杨旗 黄欢 张露松 罗国强 卢金科 ZENG Huarong;MAO Xianyin;YANG Qi;HUANG Huan;ZHANG Lusong;LUO Guoqiang;LU Jinke(Electric Power Research Institute of Guizhou Power Grid Co.,Ltd.,Guiyang 550000,China;Liupanshui Power Supply Bureau of Guizhou Power Grid Co.,Ltd.,Guizhou Liupanshui 553000,China)

机构地区：[1]贵州电网有限责任公司电力科学研究院,贵阳550000 [2]贵州电网有限责任公司六盘水供电局,贵州六盘水553000

出　　处：《高压电器》2023年第1期64-69,共6页High Voltage Apparatus

摘　　要：树障是造成线路跳闸甚至电网大停电的重要原因,研究树木临近导线放电机理对于树障预警及防范具有重要意义。文中搭建了树木临近导线放电试验平台,对试验回路高频放电电流、工频电压以及紫外、可见光图像进行了全面的监测,研究了环境湿度、树冠形状、含水量对放电特性的影响。研究结果表明:树木—导线放电形式及发展过程与树木含水量以及树木临近导线速度等因素密切相关,存在直接击穿闪络、未燃弧的强烈放电以及稳定燃弧而不闪络3种形式,而对于后两种放电形式,会产生平均幅值40~500 mA,波头时间0.17~0.88μs,波尾时间1.42~6.81μs的预放电电流。研究结论为实际输电线路树木临近时放电监测及预警奠定了理论基础。Tree barrier is an important cause of line trip and even blackout of power grid.It is of great significance to study the partial discharge mechanism of the conductor near the tree for the early warning and prevention of tree bar⁃rier.The partial discharge test platform of the conductor near the tree is set up.The high⁃frequency discharge cur⁃rent,power frequency voltage,and ultraviolet as well as visible images of the test circuit are comprehensively moni⁃tored.The influence of environmental humidity,crown shape and moisture on the discharge characteristics are stud⁃ied.The research results show that the discharge form and development process of tree⁃conductor are closely related to such factors as the moisture of trees and the speed of wires near the trees.And the discharge has such three forms as direct breakdown flashover,intense discharge without arcing and stable arcing without flashover.For the latter two kinds of discharge forms,the pre⁃discharge current at the average amplitude up to 40~500 mA,the wave head time at 0.17~0.88μs and the wave tail time at 1.42~6.81μs can be generated.The conclusion of the study lays a theoretical foundation for the monitoring and early warning of the discharge of the actual transmission lines near the trees.

关 键 词：树木故障 预放电 稳定燃弧 含水量 树冠 

分 类 号：TM75[电气工程—电力系统及自动化]