Purpose

The purpose of this paper is to investigate the simultaneous effects of ionization and dispersion of soil on the impulse behavior of grounding electrodes under first and subsequent stroke currents.

Design/methodology/approach

A recently introduced technique called improved multi-conductor transmission line (MTL) is simplified for grounding electrodes buried in both-affected soils.

Findings

The simulation results show that including the two effects simultaneously in highly resistive soils under high-valued subsequent stroke current is recommended. Otherwise, simultaneous effects can be disregard.

Originality/value

To the best of the authors’ knowledge, there is no research on sensitivity analyses for the simultaneous inclusion of the two effects on the effective length and the induced voltage on the soil surface. To this end, the simplified MTL is applied to the grounding electrodes. The simulation results show that the computational efficiency in comparison with previous methods is, first, considerably increased. Second, the simultaneous effects result in decreasing the soil surface voltage with respect to situations where either ionization or dispersion is taken into account (single-affected soils). In other words, the performance of grounding systems is improved. Third, the effective length in both-affected soil is has a middle value with respect to the single-affected soil. Such findings practically and financially are of importance.

中文翻译：

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在第一和第二冲程电流下，埋在分散电离的有损土壤中的接地电极的雷电冲击行为的参数依赖性

目的

本文的目的是研究在第一次和随后的冲击电流下，土壤电离和分散对接地电极的脉冲行为的同时影响。

设计/方法/方法

最近引入的一种称为改进的多导体传输线（MTL）的技术可简化埋在两种土壤中的接地电极。

发现

仿真结果表明，建议在高阻值的后续冲程电流下，在高电阻土壤中同时包含两种效应。否则，可以忽略同时发生的影响。

创意/价值

据作者所知，还没有关于敏感性分析的研究，因为同时分析了对土壤表面有效长度和感应电压的两种影响。为此，将简化的MTL应用于接地电极。仿真结果表明，与以前的方法相比，计算效率首先得到了显着提高。其次，相对于考虑电离或分散的情况（单受影响的土壤），同时产生的影响导致土壤表面电压降低。换句话说，改善了接地系统的性能。第三，两个受影响土壤的有效长度相对于单个受影响土壤具有中间值。这些发现在实践上和财务上都很重要。