Soil Water Content and Porosity on Earth Potential Rise of Vertical Grounding Rods

2022 Workshop on Communication Networks and Power Systems (WCNPS) Pub Date : 2022-11-17 DOI:10.1109/WCNPS56355.2022.9969674

Walter L. Manzi de Azevedo, A. R. Justo de Araújo, J. Filho

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引用次数: 1

Abstract

Several formulations have been proposed to compute the electrical parameters of soil regarding its physical properties such as frequency effect, ground stratification, porosity, water content, and temperature. This paper investigates the impact of the porosity and water content on the soil conductivity proposed by the improved Archie's model on the harmonic grounding impedance of a 3-m vertical rod buried in two types of soil (clay loam and sand). The harmonic grounding impedance is computed by the full-wave electromagnetic software FEKO® for a frequency range from 100 Hz up to 10 MHz. Then, the transient ground potential rise (TGPR) is computed for lighting currents of the first and subsequent return strokes. Results indicated a significant influence on the peak values of TGPR wave-forms obtained for saturated soils, including porosity and water content compared with those assessed with dry soils. Increasing the water content and decreasing the porosity level produce more conductive soils that impact the transient responses notably.

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土壤含水量和孔隙度对垂直接地棒接地电位上升的影响

已经提出了几种公式来计算土壤的电参数，包括其物理性质，如频率效应、地面分层、孔隙度、含水量和温度。本文研究了改进的Archie模型提出的孔隙率和含水量对土壤电导率的影响，以及埋在粘土壤土和砂土两种土壤中的3 m垂直杆的谐波接地阻抗。谐波接地阻抗由全波电磁软件FEKO®计算，频率范围从100hz到10mhz。然后，计算了第一次和随后的回击照明电流的瞬态地电位上升(TGPR)。结果表明，与干燥土相比，饱和土获得的包括孔隙度和含水量在内的TGPR波形峰值受到显著影响。增加含水率和降低孔隙率可以提高土壤的导电性，对瞬态响应有显著影响。

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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2022 Workshop on Communication Networks and Power Systems (WCNPS)

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