Estimation of the cause of the frequent occurrence of multi-phase faults on transmission lines due to winter lightning

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  • 冬季雷による送電線の多線同時地絡頻発の原因の推論
  • トウキ カミナリ ニ ヨル ソウデンセン ノ タセン ドウジチラクヒンパツ ノ ゲンイン ノ スイロン

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Abstract

In winter, the content (%) of “multi-conductor simultaneous faults” among “all the lightning faults” on double circuit transmission lines is much larger than in summer. To find a cause of the problem, many field investigations were conducted and statistics were collected. Based on these data, the author set up a new theory to estimate the probability of occurrence of multi-conductor faults during winter. This results coincide with the lightning performance of transmission lines either in summer or winter. The author's important view points which are newly introduced are followings; (1) The content (%) of large current lightnings among all the lightnings is much larger in winter than in summer (2) More than 83% of lightning flashes hit tower tops in winter, while only 25% hit tower tops in summer.

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