220 kV新杭线Ⅰ回路27年雷电流幅值实测结果的技术分析

根据220 kV新杭线Ⅰ回路全线1962—1988年实测得到的716次雷击记录,分析了该线雷击闪络原因,求得了绕击率和雷击跳闸率;并根据雷击跳闸率的变化和雷电流在杆塔中的分流情况,说明改进防雷措施。根据全线雷击点位置的统计确定了多雷区和易击点,为该线有重点、有选择性地加强防雷措施提供了实测依据。此外,还对这些实测数据进行分类统计,得到了该线雷电流幅值累积概率分布等雷电自然参数。

Technical analysis of testing results for lightning current amplitude in 27 years on 220 kV Xin-Hang No.1 line

There were 716 lightning strokes recorded at 220 kV Xin-Hang No.1 line during the past 27 years from 1962 to 1988.According to these records,the causes of lightning flashover including shielding failure stroke and back-shielding failure stroke were analyzed and therefore shielding-failure stroke rate and lightning trip-out rate were obtained.The improvement anti-lightning stroke measure was proved by the variation of lightning trip-out rate and the tower-drainage of lightning current.The high-frequency-lightning stroke spots and susceptible-to-striking points were defined by the statistical results of the lightning stroke position of the line which can provide a reference for improving lightning protection measures focally and selectively.In addition,these data determined practically were carried out classification and statistics to derive the lightning natural parameters of accumulative probability distribution etc.for lightning current amplitude value of this line.