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Optimization of tower-footing grounding impedance for guyed-V transmission towers

机译：拉制V型输电塔的塔底接地阻抗的优化

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摘要

Backflashover is one of the mechanisms by which lightning strikes can cause outages/damages in power systems. In this context, the tower-footing grounding system of transmission towers has an essential role for mitigating overvoltages that may result in backflashovers. The tower-footing grounding systems consists of long conductors, in different shapes and arrangements, buried in either homogeneous or stratified ground in order to obtain the lowest tower-footing grounding impedance. In this paper, the tower-footing grounding impedance of a typical guyed-V transmission tower is evaluated in the frequency domain using full-wave electromagnetic analysis and method of moments (MoM). Various scenarios where the tower-footing grounding system is buried in a homogeneous, a 2-, and a 3-layer stratified soil are studied. Also, the effect of the opening angle between the electrodes in the counterpoise arrangement in reducing the footing impedance is investigated. It is shown that the tower-footing impedance is notably reduced, especially when stratified soil is considered in the analysis.
机译：回击是雷击可导致电力系统中断/损坏的机制之一。在这种情况下，输电塔的塔基接地系统对于缓解可能导致回闪的过电压起着至关重要的作用。塔底接地系统由不同形状和布置的长导体组成，埋在同质或分层地面中，以获得最低的塔底接地阻抗。在本文中，使用全波电磁分析和矩量法（MoM）在频域中评估了典型的V型输电塔的塔底接地阻抗。研究了将塔基接地系统埋在均匀的2层和3层分层土壤中的各种情况。而且，研究了平衡地布置中的电极之间的张开角度在减小立脚阻抗中的作用。结果表明，塔底阻抗显着降低，尤其是在分析中考虑分层土壤时。

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