In this article, we evaluate the practical limits of length segmentation of tower-footing grounding modeling. The objective is to present a relation between computational efficiency and segmentation for transmission lines lightning performance studies. A physically consistent electromagnetic model based on field theory is applied. The segmentation process is designed to improve computational efficiency, in relation to the proposals suggested in the literature, and to maintain the precision of the results. The criteria considered acceptable for a given segmentation (in relation to a reference) are as follows: 1) the grounding potential rise (GPR) must have a peak value up to a maximum of 10% higher, 2) the lightning overvoltages peaks on the tower top (and insulator strings) must have a peak value up to a maximum of 5% higher, and 3) the GPR waveforms shall follow the same pattern (the same being valid for overvoltages). Soils with low (50–300 $\Omega {\cdot}$m), medium (300–1000 $\Omega {\cdot}$m), and high (1000–4000 $\Omega {\cdot}$m) resistivities are considered. The relative permittivity is maintained at 10. The results illustrate that the optimum segmentation can be as great as 1000 times the radius of the electrode. This ratio is higher than the maximum segment sizes suggested by the technical literature. The computational gains are quite high (over 30 times faster).

中文翻译：

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雷击响应塔基接地建模分段程序实际限制的讨论

在本文中，我们评估了塔基接地建模长度分割的实际限制。目的是为传输线闪电性能研究提供计算效率和分段之间的关系。应用了基于场理论的物理一致电磁模型。分割过程旨在提高与文献中建议的建议相关的计算效率，并保持结果的精度。给定分段（相对于参考）被认为可接受的标准如下：1) 接地电位上升 (GPR) 的峰值必须最高高出 10%，2) 雷电过电压峰值塔顶（和绝缘子串）的峰值必须最多高出 5%，3) GPR 波形应遵循相同的模式（同样适用于过电压）。低 (50–300$\Omega {\cdot}$米），中等（300–1000 $\Omega {\cdot}$m) 和高 (1000–4000 $\Omega {\cdot}$m) 考虑电阻率。相对介电常数保持在 10。结果表明，最佳分割可以达到电极半径的 1000 倍。该比率高于技术文献建议的最大段大小。计算增益相当高（快 30 倍以上）。