報告書番号

180016

タイトル（和文）

雷撃実態実測装置と高鉄塔送電線雷撃実態の実測調査－馬瀬・北部線での実測装置の検証と実測調査結果－

タイトル（英文）

LIGHTNING FAULT APPEARANCE-FINDER AND INVESTIGATION OF LIGHTNING STROKES AND LIGHTNING FAULTS ON EHV DOUBLE-CIRCUITTRANSMISSION LINE

概要 （図表や脚注は「報告書全文」に掲載しております）

超高圧以上の高鉄塔送電線の雷撃実態と事故様相を解明するために開発した送電線雷撃実態実測装置を中部電力馬瀬北部線に取りつけ，装置の性能検証と雷撃実態を明らかにした。（１）上記の実測装置は送電線の雷撃実態と事故様相の解明に適切な装置であることを自然雷により実証した。（２）強雷，山岳地域の超高圧送電線の雷撃頻度は従来考えられていた値の４倍以上で，山の尾根やその近くの山腹傾斜地の鉄塔で雷撃記録が多い傾向にある。（３）１日の襲雷で同一鉄塔に２回以上の雷撃があった場合が全雷撃の４３％を占めた。（４）強雷，山岳地域の夏季の雷撃では３０％が正極性雷撃であることが判った。（５）山の尾根近くの山腹傾斜地にある＃６２鉄塔でしゃへい失敗事故と判断される動作記録が得られた。

概要 （英文）

THE ABILITY EXAMINATION OF LIGHTNING FAULT APPEARANCE-FINDER AND INVESTIGATION OF LIGHTNING STROKES AND LIGHTNING FAULTS BY USING THE APPEARNCE-FINDERS HAS BEEN CARRIED OUT ON EHV DOUBLE-CIRCUIT MASE-HOKUBU LINE,DURING ABOUT 3.5 YEARS FROM THE SUMMER SEASON1976. MAIN POINTS ARE AS FOLLOWS: (1) IT HAS BEEN VERIFIED BY NATURAL LIGHTNING THAT THE APPEARANCE-FINDER IS MOST USEFUL EQUIPMENT FOR INVESTIGATING LIGHTNING STROKES AND LIGHTNING FAULT APPEARANCES. (2) LIGHTNING STROKE ON EHV TRANSMISSION LINE IN THE MOUNTAINOUS AND SEVERE LIGHTNING-STORM AREA IS FREQUENT AND MORE THAN 4 TIMES OF THE GENERAL VALUE. MORE LIGHTNING STROKES IS LIKELY TO BE AT THE TRANSMISSION TOWERS ON MOUNTAIN-TOP AND THE SURROUNDING MOUNTAIN-SIDE. (3) THE TRANSMISSION TOWERS RECORDED LIGHTNING STROKES MORE THAN 2 TIMES ON EACH THUNDER-STORM DAY ARE SO MANY AND ITS RATE IS ABOUT 43% OF THE TOTAL. (4) THE RATE OF POSITIVE LIGHTNING STROKES IN THE MOUNTAINOUS AND SEVERE THUNDER-STORM AREA IS CLOSE TO 30% IN THE SUMMER SEASON AND THERE IS LITTLE DIFFERENCE TO THAT OF JAPAN SEA COAST IN WINTER SEASON. (5) IT WAS RECORDED BY THE APPEARANCE-FINDER THAT ONE-PHASE FAULT ON AUG.6,1979 AT NO.62 TOWER ON MOUNTAIN-SIDE WAS CAUSED BY SHIELDING FAILURE OF LIGHTNING.

報告者

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