Frequency Dependence of Multilayer Soil Electrical Parameters: Effects on Ground Potential Rise

中国防雷 Pub Date : 2021-09-20 DOI:10.1109/ICLPandSIPDA54065.2021.9627403

M. Ghomi, C. Bak, F. D. da Silva

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引用次数: 2

Abstract

The paper presents a comprehensive study on the effect of frequency dependence of multilayer soil electrical parameters (SEPs) on ground potential rise (GPR). The lightning current has a large effect on the GPR. Typical analysis has often been based on quasistatic approximation that disregards the exact model of the grounding systems in the transient analysis of electrical networks, input impedance and GPR. To compute GPR in this paper, the full-wave approach based on the MoM solution to Maxwell equations is employed. To model the transient behavior of grounding systems, this method uses minimal approximations to find out GPR. The frequency dependence of SEPs combined with a multilayer soil are two complex issues that are modeled together. In the analysis of the GPR, special attention is given to the influences emanating from the soil multilayer structure and frequency dependency of SEPs. The GPR is calculated for three different soil configuration namely: 1) single layer, 2) two layer and 3) multilayer. From the simulations, the peak value of the GPR reduces when the frequency dependence of SEPs are taken into account. It is shown that considering the frequency dependent of multilayer SEPs can affect on the input impedance of grounding systems and GPR calculations.

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多层土壤电参数的频率依赖性:对地电位上升的影响

本文全面研究了多层土壤电参数的频率依赖性对地电位上升的影响。雷击电流对探地雷达有很大的影响。在电网暂态分析、输入阻抗和探地雷达分析中，典型的分析往往基于准静态近似，而忽略了接地系统的精确模型。为了计算探地雷达，本文采用了基于Maxwell方程MoM解的全波方法。为了模拟接地系统的暂态行为，该方法采用最小逼近法求出探地雷达。与多层土壤相结合的sep频率依赖性是两个复杂的问题。在探地雷达分析中，特别注意了土壤多层结构和sep频率依赖性的影响。计算了三种不同土壤形态的探地雷达:1)单层，2)双层和3)多层。仿真结果表明，当考虑sep的频率依赖性时，探地雷达的峰值减小。研究表明，考虑多层sep的频率依赖性会影响接地系统的输入阻抗和探地雷达的计算。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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中国防雷

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