屋面金属网格的防雷保护失效分析  

Analysis of Lightning Shielding Failure of Metal Mesh on the Roof of Building

作　　者：张小青[1] 王燕京[2] 

机构地区：[1]北京交通大学电气工程学院,北京100044 [2]北京建工学院电气系,北京100044

出　　处：《高电压技术》2005年第2期4-5,20,共3页High Voltage Engineering

基　　金：北京自然科学基金资助项目(编号:8002008)

摘　　要：介绍了一种分析建筑物屋面上金属网格防雷保护失效特性的实用方法,该方法从水平导体的引雷空间出 发,作出屋面上金属网格的防雷保护失效空间域,在该域内对雷击距累积概率密度函数空间积分,确定由金属网格 接闪失效而引起的屋面雷击率。采用该方法对不同尺寸和设置高度的金属网格进行保护失效计算的结果表明,在 考察的网格参数范围内,屋面雷击率随网格尺寸的增大而增大,随设置高度的增大而减小。为了校验该方法的有 效性,文中将本文计算结果与其它方法给出的数据进行了对比。An effective method is proposed in this paper for analyzing the lightning shielding failure of metal mesh on the roof of building. The proposed method gives a quantitative description for the shielding failure volume of metal mesh based on the lightning attractive volume of horizontal conductors. Then, the frequency of lightning strike to the roof of building is determined by taking a spatial integration of probability density function of lightning striking distance inside the shielding failure volume. The numerical calculation is performed to investigate the influence of the mesh size and suspended height on the shielding failure characteristic. The calculated results are also compared with the data from the other method in confirmation of the validity of the proposed method.

关 键 词：建筑物 防雷保护 失效分析 屋面金属网格 

分 类 号：TM862[电气工程—高电压与绝缘技术]