一次近距离自然闪电输电线路感应电压观测  

Observation of Induced Voltage on Power Lines Under a Nearby Natural Lightning

作　　者：蔡力[1] 王建国[1] 周蜜[1] 陈绍东[2] 薛健[1] 李显强[1] 

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]广东省防雷中心,广州510080

出　　处：《高电压技术》2013年第4期1000-1008,共9页High Voltage Engineering

基　　金：国家自然科学基金(51077104)~~

摘　　要：为了研究闪电在线路上产生的感应电压波形特征,分析了2008-07-31在距离低压电力线路410m附近发生的包含7次回击的自然闪电在电力线路上产生的感应电压的观测结果。在输电线路末端观测到该感应电压的波形,其电压幅值在1.05～6.33kV范围内,波前时间在6.25～36.5μs范围内,持续时间基本>200μs,最大可达1.13ms,各次感应电压之间的间隔时间在36.2～221.4ms范围内。L线和N线上的感应电压波形没有明显区别,但幅度稍有差别,L线上的峰值电压比N线上的峰值电压大了10%。根据电压波形特点,这些感应电压可分为3类。此外,输电线路经过埋地金属管后,感应电压负峰值有明显衰减,而正峰值没有明显衰减。观测的感应电压峰值比基于Rusck模型计算的数值小了约10%,但与雷电流峰值之间具有很好的线性拟合关系,线性拟合系数为0.923。In order to study the waveform characteristics of induced voltages produced by lightning, the observations of induced voltages on power lines under natural lightning, which contains 7 times return strokes taking place at about 410 m from the low-voltage power line, were analyzed. The induced voltage waveform was recorded at the end of the power line, and it had induced voltage amplitudes ranging within 1.05-6.33 kV, wave front times ranging within 6.25-36.5 μs, and duration time almost longer than 200 μs and up to 1.13 ms. The interval times between adjacent induced voltages ranged from 36.2 ms to 221.4 ms. No obvious difference but little difference in amplitudes existed between the induced voltage waveforms on L and N conductors, and the overvoltage amplitude on L conductor was 10% higher than that on N conductor. The overvoltage was categorized into three kinds due to their waveform characteristics. Moreover, negative peak values of the induced voltage that went through buried metal pipes had obvious attenuation, but the positive peak values had not. The observed peak values of induced voltages were about 10% lower than calculation results from the Rusck model, but they had a relatively linear fitting relation with a correlation coefficient of 0. 923 to the peak values of lightning currents.

关 键 词：感应电压 低压输电线路 自然闪电 雷电定位 Rusck模型 雷电流 

分 类 号：TM73[电气工程—电力系统及自动化]