Analysis and Recurrence of Lightning Stroke Accidents for Three Gorges 500-kV Transmission Lines

摘要

Lightning stoke has become the first environmentalfactor which influences the safety of 500-kV power grid in ThreeGorges near area. To grasp the operation level of transmissionlines, analyze and recur the lightning stroke accidents, andsummarize the characters, are the bases of finding and guidingthe effective lightning protection measures. In this paper, amethod of recurrence for lightning stroke accidents oftransmission lines was researched. Over 10 times of 500-kVlightning stroke accidents for about 15 lines in Three Gorgesnear area during the year of 2007-2009 were recurred andanalyzed. Combined with the lightning detection information andsimulated calculation, the range of lightning shielding incidencepoints were concluded. The conclusions and characteristics ofaccident recurrence and analysis would provide good referencesfor the lightning protection performance improvement.