捻れ回転による難着雪電線の着雪発達過程のシミュレ-ション計算法

概要

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As the measures to improve the de-snowing effects of the electric wires on long spans, anti-torsion weights or anti-torsion spacers were installed in the middle of the spans to prevent the wires from twisting.The de-snowing effects were decreased on long spans, owing to the twist of the wires in the middle of the spans due to the moment of the accreted snow.<BR>A computer aided simulation on the growth of snow accretion is presented to investigate whether accreted snow falls off during accretion or developes to the cylindrical deposit. For this computation a wire span is divided into several parts for which the change of twisted angle due to snow load is estimated. The relation between the twisted angle and the amount of snow accreted on each wire segement is calculated by the Newton-Raphson's method.<BR>Two computation examples are given for actual de-snowing electric wires; 300 m long ACSR (aluminuium conductor steel reinforced) wire with 16 mm in diameter, and 270 m long ACSR wire, 18 mm in diameter, attached with two anti-torsion weights of 0.8 kg-m. Computed twist angle in the center segment of the former wire reaches to 360°, whil the latter gives 120°.
社団法人日本雪氷学会の論文