Propagation of Lightning Current Studied by Remanent Magnetization

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カテゴリ: 論文誌(論文単位)グループ名: 【B】電力・エネルギー部門発行日: 2013/09/01タイトル(英語): Propagation of Lightning Current Studied by Remanent Magnetization著者名: Hideo Sakai (University of Toyama), Kaname Yoneza wa (Sankosha Corporation), Yoshihiro Kouno (Hokuriku Electric Power Company, Inc.), Takatoshi Shindo (Central Research Institute of Electric Power Industry)著者名(英語): Hideo Sakai (University of Toyama), Kaname Yonezawa (Sankosha Corporation), Yoshihiro Kouno (Hokuriku Electric Power Company, Inc.), Takatoshi Shindo (Central Research Institute of Electric Power Industry)キーワード: lightning，lightning current，remanent magnetization，grounding要約(英語): The propagation of lightning current underground was investigated by the remanent magnetization of materials. The study was conducted around a tower struck by lightning.(1) The remanent magnetization of the mortar layer of a transmission tower in the city of Hakusan, Ishikawa Prefecture, was studied. The distribution of magnetization showed a clockwise circular direction, indicating that a magnetic field was induced by the positive lightning current. The magnetic intensity of the mortar layer varied between the areas surrounding each of the four iron tower feet, which indicates that the shunting of the lightning current to the tower is anisotropic.(2) The behaviors of lightning current in the counterpoise and electrode were investigated through a rocket-triggered lightning experiment. The samples near the counterpoise placed at 1.3m from the tower foot had two magnetic components of different polarities, whereas the samples at 8.8m had only one component. This implies that the lightning currents of both polarities propagated in the counterpoise up to a distance of 1.8m; however, only the positive lightning current reached the electrode at a distance of 8.8m from the tower foot.The method using remanent magnetization is found to be effective for investigating the propagation of current after a lightning strike.本誌: 電気学会論文誌B（電力・エネルギー部門誌） Vol.133 No.9 （2013）本誌掲載ページ: 694-699 p原稿種別: 論文／英語電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejpes/133/9/133_694/_article/-char/ja/ Show more