雷击输电线路时全波电磁暂态特性研究  

A Study on Full-Wave Electromagnetic Transient Characteristics When Lightning Strikes a Transmission Line

作　　者：黄宇辰 杨真[2] HUANG Yuchen;YANG Zhen(School of Electrical and Information,Northeast Agricultural University,Harbin 150000,Heilongjiang,China;Network&Information Center,East China Jiaotong University,Nanchang 330013,Jiangxi,China)

机构地区：[1]东北农业大学电气与信息学院,黑龙江哈尔滨150000 [2]华东交通大学网络信息中心,江西南昌330013

出　　处：《电网与清洁能源》2022年第9期10-16,共7页Power System and Clean Energy

基　　金：江西省教育厅科学技术研究项目(GJJ209928)。

摘　　要：研究遭受雷击时输电线路的全波电磁暂态特性,可以得出雷击时输电线路出现闪络现象的概率,避免输电线路发生破损,提高其安全性和稳定性。构建输电线路雷击仿真模型,包括杆塔、雷电流和输电线路模型,模拟输电线路受到雷击的情况,并分析其在雷击作用下所产生的2类电压,包括直接雷过电压和感应过电压,以此为依据分析输电线路在雷击作用下的全波电磁暂态特性。结果表明,当中间杆塔上相被60 kA雷电流击中时,导线相本基杆塔和邻近杆塔在受到雷击1 s内容易出现闪络现象;绝缘子被雷击时产生500~600 kA的电弧电流,造成绝缘子破坏;在输电线路的导线中安装避雷器,可避免其被雷击时的跳闸现象。Studying the full-wave electromagnetic transient characteristics of a transmission line during a lightning strike can obtain the probability of a flashover in the transmission line during a lightning strike,avoid damages to the lighteningstruck transmission line,and improving its safety and stability.In this paper,a lightning strike simulation model is constructed for transmission lines including towers,lightning currents,and transmission line models to simulate lightning strikes on transmission lines and analyze two types of voltages generated by lightning strikes on transmission lines:direct lightning overvoltage and induced overvoltage.This is based on the analysis of the full-wave electromagnetic transient characteristics of transmission lines under lightning strikes.The result shows that when the upper phase of the middle tower is hit by a lightning of 60 kA current,the base tower and adjacent towers of the conductor phase are prone to flashover within 1s of lightning.When the insulator is struck by lightning,an arc current of 500~600 k A is generated,causing damages to the insulator.Installing the lightning arrester in the conductor of the transmission line can avoid the tripping phenomenon when lightning strikes the transmission line.

关 键 词：雷击输电线路 电磁暂态特性 绝缘子闪络 电弧电流 

分 类 号：TM863[电气工程—高电压与绝缘技术]