Purpose

The purpose of this paper is to propose a fast, accurate and efficient algorithm for assessment of transient behavior of grounding grids buried in horizontal multilayered earth model considering soil ionization effect.

Design/methodology/approach

The purpose of this paper is to develop a numerical simulation method to calculate the lightning impulse response of the grounding grid buried in a horizontal multilayered earth model. The mathematical model about the hybrid method based on PI basic function belonging to time domain is proposed in the paper; the mode can precisely calculate the lightning current distribution and lightning impulse response to grounding grids buried in horizontal multilayered soil model considering soil ionization effect. To increase computing efficiency, quasi-static complex image method (QSCIM) and its time-domain Green’s function closed form are introduced in the model.

Findings

The hybrid model is rather stable, with the respect to the number of elements used and with excellent convergence rate. In addition, because this mathematical model belongs to the time domain algorithm, it is very powerful for the simulation of soil ionization caused by high amplitude lightning current.

Research limitations/implications

To increase computing efficiency, QSCIM and its time domain Green's function closed form are introduced in the model.

Practical implications

The mathematical model about the hybrid method based on PI basic function can precisely calculate the lightning current distribution and lightning impulse response to grounding grids buried in horizontal multilayered soil model considering the soil ionization effect.

Social implications

Considering the soil ionization effect, the simulation calculation of lightning impulse response of substation grounding grid buried in the actual horizontal multilayered earth can effectively support the scientific and efficient design of lightning protection performance of substation grounding grid.

Originality/value

The hybrid model in time domain is originally developed by the authors and used to precisely calculate the lightning current distribution and lightning impulse response to grounding grids buried in horizontal multilayered soil model considering soil ionization effect. It is simple and very efficient and can easily be extended to arbitrary grounding configurations.

中文翻译：

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考虑时域准静态复像法和土壤电离效应的水平多层地球模型埋地网瞬态雷电响应

目的

本文的目的是提出一种快速、准确和有效的算法，用于评估埋在水平多层地球模型中的接地网的瞬态行为，并考虑土壤电离效应。

设计/方法/方法

本文的目的是开发一种数值模拟方法来计算埋在水平多层地球模型中的接地网的雷电脉冲响应。提出了基于时域PI基函数的混合方法的数学模型；该模式可以精确计算出考虑土壤电离效应的水平多层土壤模型中埋地网的雷电流分布和雷电脉冲响应。为了提高计算效率，模型中引入了准静态复数图像方法（QSCIM）及其时域格林函数闭式。

发现

混合模型在使用的元素数量和收敛速度方面相当稳定。此外，由于该数学模型属于时域算法，因此对于高幅雷电流引起的土壤电离的模拟非常强大。

研究限制/影响

为了提高计算效率，模型中引入了QSCIM及其时域格林函数闭式。

实际影响

基于PI基本函数的混合法数学模型可以精确计算考虑土壤电离效应的水平多层土壤模型中埋地网的雷电流分布和雷电冲击响应。

社会影响

考虑土壤电离效应，对埋在实际水平多层大地中的变电站接地网雷电冲击响应进行仿真计算，可以有效支持变电站接地网防雷性能的科学高效设计。

原创性/价值

时域混合模型最初由作者开发，用于精确计算考虑土壤电离效应的水平多层土壤模型中埋地网的雷电流分布和雷电脉冲响应。它简单且高效，可以轻松扩展到任意接地配置。