山区输电线路绕击暴露弧计算与分析  

Calculation and Analysis of Shielding Failure Exposure Distance for Transmission Lines in Mountain Areas

作　　者：梁贵书[1] 康琛[1] 苏红梅[2] 刘晓冬[2] 贾伯岩[2] 郑雄伟[2] 

机构地区：[1]华北电力大学,保定071000 [2]河北省电力公司电力科学研究院,石家庄050012

出　　处：《高压电器》2013年第4期86-91,共6页High Voltage Apparatus

基　　金：河南省教育厅指导性计划项目(Z20120333)~~

摘　　要：对山区同塔双回线路的耐雷性能进行研究,改进基于电气几何模型的山区输电线路绕击率算法,通过引入新判据Rx计算暴露距离,对比Rx与雷电对地击距Rg大小,讨论不同雷电流对应下的暴露距离计算方法,并对典型山区同塔双回线路绕击率进行计算,得出保护角最大的相导线并不是最可能发生绕击的,绕击率的大小与导线高度、保护角、地面倾角有关。通过分析各相线路的暴露距离与雷电流关系,解释某相线路发生绕击的现象。研究结果对同塔双回线路的防雷设计具有一定借鉴意义。In this paper,the lightning protection performance of double circuit transmission line in mountainous area is researched; based on electrical geometric model, the shielding failure rate algorithm of mountain transmission line is improved. Through introducing a new criterion Rx, calculate the exposure distance, compare Rx and Rs the distance of lightning to earth, discuss the calculation method for exposure distances corresponding different lightning current, and calculate the shielding failure rate for the typical mountainous area with double circuit line. The results show that the phase conductor with maximum protection angle not the most likely occur shielding failure, the shielding failure rate is related to the conductor height, protection angle and the ground tilt angle. By analyzing the relation between the exposure distance and the lightning current in each phase line, explain a phase line shielding failure phenomenon. The study result has certain reference significance to lightning protection design of double circuit transmission lines in mountain areas.

关 键 词：电气几何模型 雷击 绕击跳闸率 防雷 暴露距离 

分 类 号：TM863[电气工程—高电压与绝缘技术]