導電性物質が接触した配電線のコロナ特性と絶縁電線の寿命推定

概要

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In relation to the accidents due to bird nests in contact with overhead distribution lines, the authors investigated on life estimation of conductor insulation. The accident is often caused by crow or magpie. There is a region in which magpie is being specified to the protected bird in Japan. In that region, the nest in the breeding season can not be removed easily. Recently, metal wires are used for the nest material. When this conductive material is in contact with the distribution line and the arm, corona discharge will occur. The conductor insulation of the distribution line receives deterioration and there is a possibility of causing the accident. In this study, acceleration test was done to examine time from nest building to causing the accident in the distribution line. The acceleration factor based on the charge amount of corona and the influence of the applied voltage on corona characteristics were discussed. Moreover, the life of the conductor insulation was discussed from the V-t characteristics and the acceleration factor.