摘要
雷害是造成输电线路跳闸的主要原因之一,湖北地区近5年雷害跳闸占比高达33%。对某500 kV同塔双回线路雷电反击同跳故障进行了分析,计算了各绝缘子串和空气间隙的雷电冲击放电电压和各相导地线间几何耦合系数,校核了两回线路各相不同间隙的反击耐雷水平,剖析了线路故障跳闸原因。通过对比考虑/不考虑线路运行电压的耐雷水平,超高压线路考虑运行电压的耐雷水平比不考虑运行电压时低约13.6%,表明运行电压对线路耐雷水平的影响不容忽略。
Lightning damage is one of the main causes of transmission line trip-out,and the proportion of lightning damage trip-out in Hubei Province in recent 5 years has been up to 33%.This paper analyzes the simultaneous trip-out fault caused by back flashover of 500 kV double circuit on the same tower,calculating the lightning shock discharge voltages of each insulator string and air gap,and the geometric coupling coefficient between earth conductors of each phase as well.Then,the paper checks the level of withstand back-flashover of each phase gap of the two circuits and analyzes the causes of line failure trip-out.Finally,by comparing considering with disregarding the lightning resistance level of line operating voltage,the paper finds that the lightning resistance level of UHV line considering operating voltage is about 13.6%lower than that without considering operating voltage,indicating that the effect of operating voltage on lightning resistance level of transmission lines cannot be ignored.
作者
冯志强
李籽剑
周学明
熊文欢
毛晓坡
刘正云
付剑津
FENG Zhiqiang;LI Zijian;ZHOU Xueming;XIONG Wenhuan;MAO Xiaopo;LIU Zhengyun;FU Jianjin(Electric Power Research Institute,State Grid Hubei Electric Power Co.,Ltd.,Wuhan Hubei 430077,China;State Grid Hubei Power Transmission and Transformation Engineering Co.,Ltd.,Wuhan Hubei 430077,China)
出处
《湖北电力》
2022年第1期113-118,共6页
Hubei Electric Power
基金
国家电网有限公司总部科技项目(项目编号:5500-202037100A-0-0-00)。
关键词
输电线路
雷击跳闸
反击耐雷水平
几何耦合系数
transmission line
lightning trip-out
back-flashover withstand level
geometric coupling coefficient
