Abstract
The accuracy of an LLP system and a lightning frequency map are evaluated by using transmission line faults in the Hokuriku area from November 1993 to October 1996. The accuracy and efficiency of the system are calculated by statistical methods. From these results, a lightning frequency map with a 10-minute grid was proved that can replace the Isokeraunic Level Map with a 15-minute grid now used for lightning protection design. However, the correlation between the number of detected lightning flashes and transmission line faults in each mesh was found to be weak. This result suggests that a more detailed analysis taking into account the length of the transmission lines in each mesh is necessary. The correlation is stronger in winter than in summer, despite the fact that there is a difference in the lightning current distribution in each mesh in winter. This characteristic can be explained if upward flashes from transmission lines are dominant among lightning faults in winter. © 1999 Scripta Technica, Electr Eng Jpn, 129(4): 45–57, 1999
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