雷电流陡度与幅值的相关性初探  

Correlation Discussion between Lightning Current Gradient and It's Amplitude

作　　者：孙萍[1] 吴璞三[2] 周照宗 周锡忠[4] 

机构地区：[1]浙江省电力试验研究院,浙江杭州310014 [2]金华电业局,浙江金华321001 [3]杭州市电力局,浙江杭州310009 [4]嘉兴电力局,浙江嘉兴314000

出　　处：《浙江电力》2007年第1期4-5,22,共3页Zhejiang Electric Power

摘　　要：用改进型磁钢式雷电流陡度仪于1983～1987年在浙江省共实测得雷击塔顶20个陡度数据，雷击档内向两边分流的入塔电流98个陡度值，它们各自与其幅值的相关系数分别为＋0．51与＋0．75，正紧密相关，因此可将雷电流的波头时间τ1粗略地看成常数，DL／T620—1997标准中取n=2．6μs。据此，根据雷电流幅值累积概率分布公式lgP=-I／88，反推得出浙江电网雷电流陡度的累积概率分布式。From 1983 to 1987, it were tested with improved magnetic-steel lightning current gradient device in Zhejiang that 20 lightning current gradients were measured when the lightning stroke on tower top and 98 in - tower lightning current gradients when it stroke the mid - span and then the lightning current is draining both way along the line. Their correlation coefficient is ＋ 0.51 and ＋ 0.75, so the wave - head time of the lightning current can be regarded as constant approximately which is 2.6 μs in DL/T620- 1997 code. According to the lightning current amplitude accumulative probability formula lgP = - I/88, the accumulative probability formulus of the lightning current gradient is obtained.

关 键 词：雷电流陡度 幅值 相关系数 波头时间常数 

分 类 号：TM863[电气工程—高电压与绝缘技术]