II. LIGHTNING FAILURE SITUATION OF 500KV
TRANSMISSION LINE IN SOUTHERN CHINA
Figure 1 shows the ground flash density in southern
China during the year 2010 to 2012 respectively. It shows
the frequent lightning in southern China, among which
2010 is the most, and in some area it is over 15.5
flashes/km2/yr. The security of transmission lines in
southern China will be seriously influenced.
Statistical data shows that 83 lightning trip outs have
happened on 500kV transmission lines in southern China
during the year 2010 to 2012.Following conclusions can
be drawn according the data.