220 kV谏泰线跨江段的防雷措施与运行效果

220kV谏泰线在镇江境内跨越长江，跨江段全长2338m，其中江面主跨1288m，两侧跨江塔高106m。因为主塔高、跨度大，易受雷击。由于特殊原因，从1985年开始，跨江段失去了避雷线保护。为保证线路安全运行，研制安装了保护绝缘子串的引弧间隙，并先后在锚塔和高塔上安装了避雷器。18年来，有失败的教训，也有成功的经验?如此之高塔，如此之大跨越，采用非避雷线方式防雷，并最终取得了成功，这在国内外尚属首例。本文介绍了无避雷线保护的跨江段防雷措施的试验研究、现场实施和运行效果。

Lightning protection measures and effects of 220 kV Jian-tai transmission line section across the Yangtze River

kV Jian-tai transmission line crosses the Yangtze River in Zhenjiang,and the total length of across river section is2338m,in which the main crossover on the river surface is1288m,and crossover tower on the two sides is106m high.The main tower is higher with big crossing span,and easy to get strike of thunderbolt.Because of special reason,from1985,across river section have lost lightning protection conductor.To ensure operation of transmission line safely,the arcing gap of insulator was developed and installed,and arrester was installed one after another on anchor tower and high tower.There is the lesson or successful experience since18years.The way to adopt no lightning protection conductor for so high tower and so big crossing span is the first example being domestic and international.This paper introduces the testing research of no lightning protection conductor for across river section.The operation effects and enforcement on site are also presented.