摘要
多重雷击过程是自然雷电中的普遍现象.短时间沿同一路径发生的多次回击将严重威胁输电线路安全运行.以某地区500 kV线路发生避雷器损毁故障为例,结合雷电定位数据,对故障录波进行了详细分析,对杆塔耐雷水平进行了校核,确定了该次故障由一次较为罕见的多重雷绕击线路引起.该多重雷击包含一次主放电与7次后续回击过程,且后续雷击电流峰值与主放电电流峰值相当.对注入线路避雷器的能量进行估算,结果表明多重雷击注入避雷器的能量可达避雷器耐受值的两倍以上,热击穿是造成避雷器损毁的主要原因.
Multiple lightning strokes process are a common phenomenon in natural lightning.Multiple return strokes along the same path in a short time will seriously threaten the safe operation of transmission lines.Taking the lightning arrester failure of 500 kV line in a certain area as an example,this paper combines with lightning location data to analyze the fault recording wave in detail,and check the lightning resistance level of the tower,with the fault determined to be caused by a rare multiple lightning striking the transmission line.The multiple lightning strike consists of one primary discharge and seven subsequent return strokes,and the peak value of the subsequent lightning strike current is equivalent to the peak value of the primary discharge current.The energy injected into the line arrester is estimated.The results show that the energy injected into the arrester by multiple lightning strikes can reach more than twice the withstand value of the arrester,and that thermal breakdown is the main reason for the damage of the arrester.
作者
冯志强
李籽剑
姚尧
汪显康
付剑津
任想
张耀东
黄俊杰
FENG Zhiqiang;LI Zijian;YAO Yao;WANG Xiankang;FU Jianjin;REN Xiang;ZHANG Yaodong;HUANG Junjie(Electric Power Research Institute,State Grid Hubei Electric Power Co.,Ltd.,Wuhan Hubei 430077,China)
出处
《湖北电力》
2023年第2期87-91,共5页
Hubei Electric Power
基金
国家电网公司科技项目(项目编号:5108-202218280A-2-349-XG)
关键词
多重雷击
线路避雷器
雷电绕击
热击穿
multiple lightning strikes
line arrester
lightning shielding failure
thermal breakdown
作者简介
冯志强(1986),男,湖北随州人,研究生,博士学位,高级工程师,研究方向为电力系统雷电防护技术、输电线路运维技术。
