基于ADTD系统的雷电流波头陡度频率分布特征

通过对ADTD闪电定位系统2006 2008年在重庆地区监测的729598次闪电进行统计,重点分析雷电流陡度的频率分布特征。结果表明:雷电流波头陡度及其频率随极性不同而差异较大,正闪陡度明显大于负闪陡度,而同陡度负闪频率却显著大于正闪;雷电流幅值与陡度相关系数为+0.613;采用电力行业标准DL/T620推荐波头时间反推得到的雷电流陡度和采用Ciger推荐公式计算得到的雷电流陡度的概率分布特征与统计特征差异较大。在此基础上分析了ADTD系统获取雷电流陡度资料的局限性,为合理选取雷电流陡度参数提供理论依据。

Distribution Characteristics of Lightning Current Wave Head Gradient Based on ADTD System

The lightning current amplitude and gradient are significant in the fundamental researches of lightning protection and science.A statistical analysis is made of 729598 lightning flashes monitored by the ADTD lightning location system in Chongqing between 2006 and 2008,with focus on the analysis of the distribution characteristics of lightning current gradient and frequency.The results show that the lightning wave-head gradient and frequency are different with different polarities;the gradient of positive lightning is obviously greater than that of negative lightning,and the frequency of negative lightning is obviously greater than that of positive lightning at the same gradient;the correlation coefficient between lightning current amplitude and gradient is ＋0.613;there is great difference between the probability-distribution characteristics,as well as the statistical characteristics,of the lightning gradients calculated by the DL/ T620-recommended wave-head time and that calculated by the CIGER-recommended formula.Based on these findings,the limitations of lightning current gradient obtained by the ADTD system are analyzed, which offers theoretical evidences for the right selection of lightning gradient parameters.