報告書番号

123

タイトル（和文）

配電線誘導雷現象の解析とその実証

タイトル（英文）

ANALYTICAL AND CORROBORATIVE STUDY ON OVER-VOLTAGES INDUCED ON POWER DISTRIBUTION LINE DUE TO NEARBY LGHTNING STROKES

概要 （図表や脚注は「報告書全文」に掲載しております）

避雷器や架空地線などの耐雷設備を装備した実配電線に適用できる多導線系誘導雷現象解析プログラムを開発し，実験室内の縮小モデル実験で，プログラムの妥当性を確認した。さらに，新しい誘導雷電圧観測手法を開発し，雷放電怪路の写真観測ならびに雷撃電流波形観測と誘導雷電圧波形の同時観測にはじめて成功した。得られた雷撃電流波形を用いて上述した誘導雷現象解析プログラムで誘導雷電圧波形を推定したが，これは実測で得た誘導雷電圧波形とよく一致している。

概要 （英文）

THIS REPORT DESCRIBES RESULTS OF ANALYTICAL AND CORROBORATIVE STUDY ON OVER-VOLTAGES INDUCED ON A POWER DISTRIBUTION LINE DUE TO NEARBY LIGHTNING STROKES. SIGNIFICANT FINDINGS ARE AS FOLLOWS: (1)A COMPUTER PROGRAM HAS BEEN DEVELOPED FOR NUMERICALLY ANALYZING LIGHTNING INDUCED VOLTAGES ON MULTICONDUCTOR LINES. (2)THE RESULTS OBTAINED WITH THIS COMPUTER PROGRAM WERE COMPARED TO THE RESULTS FROM AN ANALOG SIMULATION USING A 1:200 SCALE MODEL, AND FOUND TO BE IN GOOD AGREEMENT, DEMONSTRATING THE VALIDITY OF THE PROGRAM. (3)VOLTAGE SURGES INDUCED ON A DISTRIBUTION SITUATED AT A DISTANCE OF 200M FROM THE LIGHTNING FLASH POSITION, AND FOR WHICH THE ASSOCIATED LIGHTNING CURRENT WAVEFORMS HAVE BEEN DETERMINED, WERE MEASURED. THE INDUCED VOLTAGES ON THE DISTRIBUTION LINE WERE CALCULATED BY THE ABOVE COMPUTER PROGRAM USING THE RECORDED CURRENT WAVEFORMS, AND THE RESULTS FOUND TO BE IN GOOD AGREEMENT WITH THE RECORDED INDUCED VOLTAGES. (4)THE SHIELDING EFFECTS OF AN OVERHEAD GROUND WIRE AND THE SUPPRESSING EFFECTS OF A SURGE ARRESTER AGAINST LIGHTNING INDUCED VOLTAGES WERE CLARIFIED.

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