Establishment of estimation lightning density method with lightning location system data

The lightning strike density level in areas through which power transmission lines will pass is an important factor in designing lightning-proof transmission lines. Formerly, IKL (Tsokeraunic-Level) maps were used to evaluate lighting strike density. However, the authors´ studies indicated that the IKL map and the actual record of lightning strike troubles affecting their company´s transmission lines do not necessarily correspond. Therefore, they recently studied an evaluation method that substitutes for the IKL map the distinctive characteristics of a particular locality, using the lightning strike frequency calculated from the actual records of existing transmission line lightning strike troubles and LLS (lightning location system) data, as lightning strike frequency evaluation indices. Consequently, they have clarified the fact that LLS data and actual records of existing transmission line lightning strike troubles show high-level correlation. This means that lightning strike density can be accurately evaluated, with topographic distinctions, by introducing the regression equation of LLS data combined with the lightning strike incidence.