青藏铁路格尔木-拉萨段110kV供电系统雷电活动规律统计分析

为向青藏铁路格尔木—拉萨段供电系统的防雷工作布置提供参考依据,统计分析了国家气象局积累的1951~2001年间格拉段沿线主要变电站的雷电活动地面观测数据,总结出了高原各站点多年的雷电活动呈不断变化趋势,在时间上主要集中在5~9月份,在空间上格尔木最弱,当雄最强。最终得出了青藏铁路格拉段沿线地区的雷电活动具有高原特性,即雷电活动频繁但强度不大,并据此对格拉段沿线地区进行了雷区的划分,建议格尔木—纳赤台段划为少雷区,其他地段均划为中雷区。

Statistic Analysis on Lightning Activity Regularity of Power Supply System along Railroad Section from Golmud to Lhasa in Railway from Qinghai to Tibet

To provide reference for lightning protection design of power supply system along the railroad section from Golmud to Lhasa in railway from Qinghai to Tibet,the statistical analysis on ground observation data of lightning activity of main substations along the section from Golmud to Lhasa,which are accumulated by State Meteorological Administration in recent 50 years,is conducted,and the variation trend of the lightning activity at this section is summarized.As for the time range,almost all the lightning activity concentrates on the period from May to September;as for space,the lightning activity at Golmud is the weakest while that at Dangxiong is the strongest within this railroad section.Therefore,such a conclusion is obtained that the lightning activity along the railroad section from Golmud to Lhasa in the railway from Qinghai to Tibet possesses obvious plateau property,i.e.,the lightning activity is frequent but its intensity is weak.According to this conclusion,the section from Golmud to Lhasa is divided into different thuderstorm regions,namely the subsection from Golmud to Nachitai belongs to less thunderstorm region and the subsection from Nachitai to Lhasa belongs to middle thunderstorm region.