考虑土壤电导率分层时的雷电时域水平场估算方法研究

Study on Estimation Method of Lightning Time Domain Horizontal Field Considering Soil Conductivity Stratification

针对现有的雷电水平场估算方法只适用于土壤电导率均匀分布的情况,为拓宽了已有算法的适用范围,提出了一种适用于多层水平分层的计算方法。首先计算土壤电导率均匀分布时的水平场传播特性,借鉴分析方法,并结合传输线模型理论,分析土壤电导率水平分层时的水平场传播特性,最后利用2D-FDTD技术对本发明提出的计算方法进行进度检验。通过对两种电导率配置下的水平电场波形分析后发现,水平电场波形上升沿部分与上层土壤特性有关,下降沿部分与下层土壤特性有关。若将2D-FDTD的计算结果作为精确解,本文提出的水平场新算法误差基本在9%之内。

The existing lightning horizontal field estimation method is only suitable for the uniform distribution of soil conductivity.In order to broaden the applicable range of existing algorithms,the author proposes a calculation method suitable for multi-level horizontal stratification.Firstly,the horizontal field propagation characteristics of soil conductivity uniform distribution are calculated,and the analysis method is combined with the transmission line model theory to analyze the horizontal field propagation characteristics of soil conductivity level stratification.Finally,the calculation method proposed by the 2D-FDTD technique is proposed.Conduct a progress check.By analyzing the horizontal electric field waveforms under the two conductivity configurations,it is found that the rising edge of the horizontal electric field waveform is related to the characteristics of the upper soil,and the falling edge is related to the characteristics of the lower soil.If the calculation result of 2D-FDTD is taken as an exact solution,the error of the new horizontal field algorithm proposed in this paper is basically within 9%.