雷电流陡度与幅值的相关性初探Correlation Discussion between Lightning Current Gradient and It's Amplitude
孙萍,吴璞三,周照宗,周锡忠
SUN Ping,WU Pu-san,ZHOU Zhao-zong,etc.
摘要(Abstract)：
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tτ粗略地看成常数,DL/T620-1997标准中取τt=2.6μs。据此,根据雷电流幅值累积概率分布公式lgP=-I/88[1],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 μ s 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(KeyWords)：
雷电流陡度;幅值;相关系数;波头时间常数
lightning current gradient;amplitude;correlation coefficient;wave-head time constant
基金项目(Foundation):
作者(Author):
孙萍,吴璞三,周照宗,周锡忠
SUN Ping,WU Pu-san,ZHOU Zhao-zong,etc.
DOI: 10.19585/j.zjdl.2007.01.002
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