输电线路与引雷塔雷电监测与雷电流波形分析

Monitoring and Analysis of Lightning Current Waveform Observed on Transmission Line and Lightning Tower

为更好地了解雷电特性,分析了由武汉大学负责开发的雷电流在线监测系统获取的4组雷电流波形。该系统已安装43套监测装置,分布在国家电网和南方电网110、220、500kV输电线路以及高楼和引雷塔等易遭受雷击的地点。已测到的4组雷电流波形分别为:2007-04-22湖北咸宁110kV汪官线路51号塔,雷击于杆塔塔顶,幅值为-11.8kA,振荡波;2008-09-17深圳凤凰山引雷塔;2010-09-08T14:39:21云南电网220kV鲁罗Ⅰ回51号杆塔,雷绕击于导线,幅值为-10.0kA,波前时间0.5μs,半波时间23.0μs;2010-09-08T23:46:49云南电网220kV鲁罗Ⅰ回51号杆塔,雷绕击于导线,幅值为-9.3kA,波前时间1.0μs,半波时间22.0μs。4次雷电活动从时间和空间上均与雷电定位系统数据相符,电流波形有振荡衰减现象。得到的雷电流波形可为防雷设计提供参考依据。

For better understanding lightning characteristics, we analyzed four lightning current waveforms obtained by an online lightning current monitoring system which was developed by Wuhan University. The system had 43 monitoring devices, which were distributed on transmission lines of 110, 220 and 500 kV, and some other lightning- attracting places, such as tall buildings and lightning towers. The four typical lightning current waveforms were as follows： the first one was a lightning strike on No. 51 tower of 110 kV Wangguan line in Hubei Power Grid on April 22rd, 2007, current amplitude of which was --11.8 kA; the second one was a lightning strike on a lightning tower on Fenghuang Mountain in Shenzhen, on September 17th, 2008; the third one was a lightning strike on No. 51 tower of 220 kV Luluo I line in Yunnan Power Grid, at 14：39：21 on September 8th, 2010, which had current amplitude of --10 kA, wavefront of 0.5 Vs, and half wave time of 23.0 /~s; the last one was a lightning strike on No. 51 tower of 220 kV Luluo I line in Yunnan Power Grid, at 23：46：49, on September 8th, 2010, which had current amplitude of --9.3 kA, wavefront of 1.0 〉s, the four lightning current currents were oscillating protection. waveform were consistent The observed lightning and half wave time of 22.0 p.s. Time and space information of with the data of lightning location system; all the lightning current waveforms can be referred in practical lightning