考虑后续雷击的高压架空输电线路雷电过电压研究  

Lightning Overvoltage of High Voltage Overhead Transmission Line Considering Follow-Up Lightning Strike

作　　者：罗楚楠 张胜 黄一威 LUO Chunan;ZHANG Sheng;HUANG Yiwei(Guangdong Power Grid Energy Development Co.,Ltd.,Guangzhou 510160,China;Beijing Yupont Electric Power Technology Co.,Ltd.,Beijing 100029,China;School of Electrical Engineering,Shanghai Electric Power University,Shanghai 200090,China)

机构地区：[1]广东电网能源发展有限公司,广州510160 [2]北京煜邦电力技术股份有限公司,北京100029 [3]上海电力大学电气工程学院,上海200090

出　　处：《电瓷避雷器》2022年第5期25-30,共6页Insulators and Surge Arresters

摘　　要：架空输电线路遭受雷击会出现很高的暂态过电压,国内外学者对输电线路的首次雷击暂态响应作了大量计算,但未见分析考虑后续雷击的影响。为了全面分析雷击对输电线路的影响,建立了考虑后续雷击输电线路模型,采用该模型对线路暂态电位进行了计算;对比分析了其遭受首次雷击和后续雷击两种情况的暂态电位波形。结果表明:绕击时后续雷击在输电线路上产生的雷电过电压比首次雷击高15.14%;过电压上升时间约等于首次雷击的一半,后续雷击输电线路的危害比首次雷击大;雷击杆塔塔顶时,首次雷击比后续雷击在输电线路中所产生的过电压高一倍左右,且首次雷击时过电压衰减过程中的震荡频率比后续雷击的更高;后续雷击避雷线档距中央时线路过电压仅为工作电压幅值的1.32倍,首次雷击时与雷击杆塔塔顶的过电压变化规律基本吻合,所以反击情况下,首次雷击对输电线路危害更大;在输电线路防雷保护设计时应该考虑后续雷击。Lightning strikes on overhead transmission lines can cause high transient overvoltage. Scholars at home and abroad have made a lot of calculations on the transient response of the first lightning strike of the transmission line, but no analysis has considered the impact of subsequent lightning strikes. In order to comprehensively analyze the impact of lightning strikes on transmission lines, a transmission line model considering subsequent lightning strikes was established, and the transient potentials of the transmission lines were calculated using this model;the transient potential waveforms of the first and subsequent lightning strikes were compared and analyzed. The results show that the lightning overvoltage generated by subsequent lightning strikes on the power transmission line during winding is 15.14% higher than that of the first lightning strike;the overvoltage rise time is approximately equal to half of the first lightning strike, and the damage of subsequent lightning strike transmission lines is greater than the first lightning strike;At the top, the first lightning strike is about twice as high as the overvoltage generated by the subsequent lightning strike on the transmission line, and the oscillation frequency during the overvoltage attenuation during the first lightning strike is higher than that of the subsequent lightning strike;the subsequent lightning strike line is at the center of the line. The overvoltage is only 1.32 times the amplitude of the working voltage. The first lightning strike is basically consistent with the overvoltage change law at the top of the tower of the lightning strike tower. Therefore, the first lightning strike is more harmful to the transmission line in the case of a counterattack. When designing the lightning protection of the transmission line, follow-up lightning strikes should be considered.

关 键 词：高压输电线路 后续雷击 直击雷 暂态电位 ATP-EMTP 

分 类 号：TM863[电气工程—高电压与绝缘技术]