報告書番号

T99011

タイトル（和文）

山頂負荷供給配電線の雷被害様相と雷害対策状況

タイトル（英文）

Investigation of lightning outages and method of lightning protection of power distribution lines located in mountainous areas.

概要 （図表や脚注は「報告書全文」に掲載しております）

日本海沿岸の山頂負荷供給配電線の効果的な雷害対策の検討のため，その地域25ヶ所の雷被害分析を行い，以下の特徴を明らかにした。1)雷被害箇所では，需要家供給高圧柱での被害が約40%と多く，雷被害の多くは高構造物を有する需要家への雷撃による逆流雷現象に起因することが明らかになった。2)電力設備では雷被害機器の約50%が高圧避雷装置であった。3)需要家供給高圧柱の雷被害分析では，避雷装置被害が45%，柱上変圧器被害が40%と同程度で発生していた。4)雷被害分析結果より対策の要点として，避雷器焼損防止対策を優先的に検討する必要があり，対策箇所では需要家供給高圧柱に対する対策，特にそこに施設される避雷装置および柱上変圧器の対策を検討することが重要である。5)架空地線の施設状況別の避雷器雷被害率の調査結果から，架空地線の多条化が避雷器焼損防止対策に有効であることを明らかにした。

概要 （英文）

High-energy lightning strokes sometimes occur on the Japan Sea coastline in winter. This winter lightning often damages overhead power distribution lines, in particular, those supplying power to tall structures located in mountainous areas. We have investigated the characteristics of lightning outages on such distribution lines in 25 places in order to establish effective countermeasures against damage due to winter lightning.In mountainous areas, approximately 40% of lightning strokes that result in power outages occur at the pole nearest the tall structure. The total ratio of lightning outages at these poles and at tall structures was approximately 70%. Most lightning outages in mountainous areas are caused by backflow lightning currents from the tall structure to the power distribution line. The ratio of surge arrester damage to all damaged installations on such power distribution lines is approximately 50% at maximum. At the poles nearest the tall structures, the ratios of damage to surge arresters and transformers are 45% and 40%, respectively. It has been shown that for lightning protection for distribution systems supplying power to tall structures in mountainous areas, protection at poles nearest the tall structure is most important. Lightning protection against surge arrester damage caused by winter lightning should have priority over all other measures. In addition, lightning protection for transformers on poles supplying power to a tall structure is also important.

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