Evaluation of lightning attachment and coupling models for the estimation of the lightning performance of overhead distribution lines

The lightning performance of overhead distributions lines affects significantly the reliability of distribution power network. Lightning-related flashover of line insulation is caused by direct and nearby strokes. This paper presents a generalized methodology for the estimation of the flashover rate of overhead distribution lines that considers several lightning attachment and coupling models. Results of the proposed methodology are discussed and compared with A. J. Eriksson´s field observations. Based on the consistency between estimated values and field data suggestions are made for the appropriate selection of lightning attachment and coupling models for the evaluation of the lightning performance of distribution lines.