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Lightning strokes with a large amount of energy sometimes occur on the Sea of Japan coast in winter. Winter lightning often damages overhead power distribution lines, in particular, those supplying power to high structures located in mountainous areas. We have investigated the characteristics of lightning outages on such distribution lines in order to establish effective countermeasures against damages from winter lightning. The ratio of surge arrester damages with respect to all damaged installations on such power distribution lines is the largest of approximately 50 %. We have experimentally examined the effectiveness of installing two sets of surge arresters in parallel on a single pole as a method for preventing distribution surge arrester damages. In the case of installing 2.5 kA and lOkA rated arresters with different voltage-current characteristics in parallel, the lOkA rated arrester stop flowing currents, when the 2.5 kA rated arrester discharge. The current finally flows into only the 2.5 kA rated arresters. We have clarified that to install surge arresters in parallel is effective in reducing the energy absorbed by surge arresters if these surge arresters have the almost same discharge voltage and voltagecurrent characteristics.

denki gakkai rombunshi. b, denryoku, enerugi bumonshi/denki gakkai rombunshi. b, denryoku, enerugī bumonshi

Evaluation of Installing Two Sets of Distribution Surge Arresters in Parallel on a Single Pole as a Method for Preventing Distribution Surge Arrester Damages