Lightning activity causes the different lightning impacts to transmission lines varying with the time and region,accordingly,the lightning protection performance has a great difference in time and space.In order to completely master the lightning protection performance of transmission lines,we presented an evaluation method which takes the time-space-difference lightning protection performance of transmission lines into account especially.On the basis of the long-term lightning data detected by lightning location system,we adopted the grid statistical method of lightning parameters to carry out the lightning parameter analysis along the transmission line corridor in the appointed time period.With the obtained lightning parameters including ground flash density and cumulative probability distribution of lightning current,the lightning trip-out rate of transmission line as well as each line section were calculated in the appointed time period.Compared with the evaluation grade determined from the designed value,defined value or operating value of the lightning trip-out rate of the line,the time-space-difference of lightning protection performance of the transmission line was evaluated with detailed grades.The evaluation results can be used in taking more appropriate and selective lightning protection measures to improve the lightning protection performance of transmission lines.
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