The structure of head of 500 k V tension tower of compact transmission line is complex

and shielding failure trip-out rate of this kind of tower cannot be calculated precisely by traditional calculation method. By establishing an elaborate model of 500 k V tension tower of compact transmission line

we proposed an analysis method of lightning shielding failure trip-out rate of tension tower of compact transmission line on the basis of analysis method of whole span lightning shielding performance

and researched the shielding failure trip-out rate of this kind of tower before and after dismantling ground wire branch. The analysis results show that

after ground wire branch being demolished

the shielding failure trip-out rate of the tower will increase by about 16.3%. Therefore

tower lateral rod is proposed to improve lightning shielding performance. The research results indicate that installing tower lateral rod can notably lower the lightning shielding failure trip-out rate of the tower. Moreover

when three tower lateral rods are respectively installed in three jumper cross arms

the shielding failure trip-out rate of the tower can be lowered by about 59.25%. The research results will provide valuable references for lightning protection renovation on 500 k V tension tower of compact transmission line in China.