The paper deals with the evaluation of lightning threat to distribution network feeders based on the advanced use of high-resolution flash density maps. High-resolution flash density maps with a resolution of 100 × 100 m are calculated from lightning information collected by a lightning location system. By implementing advanced topological and spatial analysis of the distribution network, it is possible to evaluate lightning threat probability per feeder. The results of such analysis represent key input data for protective measures to undertake, such as installing line surge arresters or replacing the overhead line with a cable line. The paper also describes the procedure for determining optimal investment in line surge arresters for improving distribution line lightning performance. The procedure uses a method based on flash density moments to evaluate the impact of flash density and length of line sections to line performance and thus the cost of line failures.
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