基于LLS的多回击地闪回击时间和回击间距的统计特征  

Statistical Characteristics for Return Stroke Time and Distance of Multi-return Stroke About Cloud-to-ground Lightning Based on LLS

作　　者：王学良[1,2] 成勤 谷山强 王清龙 张科杰[1] 余田野 WANG Xueliang;CHENG Qin;GU Shanqiang;WANG Qinglong;ZHANG Kejie;YU Tianye(Lightning Protection Center of Hubei Province,Wuhan 430074,China;Hubei Key Laboratory of Power Grid Lightning Risk Prevention,Wuhan 430074,China;Yichang Meteorological Bureau of Hubei Province,Yichang 443000,China;Wuhan NARI Limited Company,State Grid Electric Power Research Institute,Wuhan 430074,China)

机构地区：[1]湖北省防雷中心,武汉430074 [2]电网雷击风险预防湖北省重点实验室,武汉430074 [3]宜昌市气象局,宜昌443000 [4]国网电力科学研究院武汉南瑞有限责任公司,武汉430074

出　　处：《高电压技术》2020年第11期3914-3924,共11页High Voltage Engineering

基　　金：湖北省防雷中心科研基金(FL-Z-2019001)。

摘　　要：为了进一步研究多回击地闪参数分布特征,为雷电防护工程设计和雷电物理研究提供参考,根据湖北省气象部门雷电定位系统(LLS)2007年1月至2017年12月监测资料,采用数理统计方法,对多回击次数、回击时间和回击间距等参数进行了统计分析。结果表明:正、负和总地闪平均多回击百分比分别为2.13%、35.06%和32.97%;多回击正、负、总地闪的算术平均和几何平均间隔时间分别为101.17、136.38、136.30和67.43、107.75、107.65 ms,持续时间分别为104.29、239.70、239.15和70.28、203.22、202.68 ms。多回击地闪平均间隔时间随回击次数的增加呈自然对数减少,平均持续时间随回击次数的增加呈自然对数增加;多回击正地闪回击间距和回击半径约为4 km,多回击地闪平均回击间距约1.7 km、回击半径约2.2 km;多回击地闪中,80%以上的回击间距≤3km,回击半径≤4 km,97%以上的回击半径≤8 km。多回击地闪随着回击次数增加,回击间距呈自然对数减少,回击半径呈自然对数增加。多回击地闪的平均间隔时间大小与LLS探测地闪回击效率和资料统计方法有关;多回击地闪间隔时间、持续时间、回击间距和回击半径年、月和日变化特征是否具有普遍性及其产生的机理还有待进一步深入研究。To further investigate the distribution characteristics of multi-return stroke of cloud-to-ground(CG) lightning, and provide references for the design of lightning protection engineering and lightning physics research, the parameters such as multiple strokes lightning frequency, return stroke time and distance are analyzed by a mathematical statistics method. These data are monitored by the lightning location system(LLS) of Hubei Meteorological Department from January 2007 to December 2017. The results show that the average percentages for multi-return stroke of positive, negative and total CG lightning account for 2.13%, 35.06% and 32.97%. The arithmetic and geometric average interval time for multi-return stroke of positive, negative and total CG lightning are 101.17 ms, 136.38 ms, 136.30 ms, 67.43 ms, 107.75 ms and 107.65 ms, and their average durations are 104.29 ms, 239.70 ms, 239.15 ms, 70.28 ms, 203.22 ms and 202.68 ms. The average interval time for multi-return stroke of CG lightning shows a natural logarithmic decrease trend with the increase of stroke frequency. The average duration shows a natural logarithmic growth trend with the increase of stroke frequency. The stroke distance and radius for positive multi-return stroke are about 4 km. The average stroke distance for multi-return stroke is about 1.7 km, and its average radius is about 2.2 km. The stroke distance of more than 80% of multi-return stroke of CG lightning is less than 3 km, and the stroke radius is less than 4 km. Nearly 97% of the lightning stroke radius is not more than 8 km. With the increase of stroke frequency, the stroke distance shows a natural logarithmic decrease trend and the stroke radius shows a natural logarithmic growth trend. The average interval time of multi-return stroke is related to the detection efficiency of LLS and its statistical method. The universality of the annual, monthly and diurnal variation characteristics for the interval time, duration of stroke, lightning stroke distance, radius for multi-return stroke,

关 键 词：多回击 云地闪 间隔时间 持续时间 回击间距 回击半径 

分 类 号：TM863[电气工程—高电压与绝缘技术]