A Study on a Lightning-Surge Analysis Composite Model of a Reinforced Concrete Pole and a Grounding Electrode in Power Distribution Lines

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  • 配電線雷サージ解析における柱体·接地極の複合モデルに関する検討
  • 配電線雷サージ解析における柱体・接地極の複合モデルに関する検討
  • ハイデンセン ライ サージ カイセキ ニ オケル チュウタイ セッチキョク ノ フクゴウ モデル ニ カンスル ケントウ

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Abstract

It has been well known for many years that grounding resistance has a current-dependent characteristic due to soil ionization. Moreover reinforced concrete poles should be treated as a kind of grounding electrode against lightning strokes. However, these characteristics were seldom taken into account for lightning-protection designs. If these characteristics are represented in EMTP models for lightning protection designs, the rationalization of the lightning protection designs for distribution lines is expected.<br>In order to clarify transient behaviors of a system of a grounding electrode and a concrete pole, experiments were conducted with full-scale grounding systems. In this study, the paper described a composite model of a reinforced concrete pole and a grounding electrode for distribution lines and compared the calculated waveforms with measured waveforms of the experiments. The results show that it is necessary to take a current-dependent characteristic into account and treat concrete poles as a kind of grounding electrode.

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