高结构体雷击率计算  

Calculation of Annual Frequency of Lightning Strike to Freestanding Tall Structures

作　　者：张小青[1] 

机构地区：[1]北方交通大学电气工程学院,北京100044

出　　处：《高电压技术》2003年第3期3-5,共3页High Voltage Engineering

基　　金：北京自然科学基金 ( 80 0 2 0 0 8号 );教育部<高等学校骨干教师资助计划>( 5 3 1号 )资助项目

摘　　要：介绍了一种高结构体年雷击率的新算法 ,它先按雷电极性定义高结构体的有效引雷空间域 ,在其内按雷击距作出高结构体的受雷曲面 ,通过在受雷曲面上对雷电下行先导取向角及雷击距的概率密度函数实施积分来求取高结构体的等值受雷面积 ,再由此受雷面积和地面落雷密度算出高结构体的年雷击率。This paper proposes a new method for calculating the annual frequency of lightning strike to freestanding tall structures. In this method, the attractive volume of a freestanding tall structure is defined in terms of the lightning polarities. The exposure surfaces are located inside the attractive volume according to the striking distances. In order to obtain the equivalent exposure area of the freestanding tall structure, the integral of the probability density functions is performed on the exposure surfaces with respect to downward leader approach angle and striking distance. Then, the annual frequency of lightning strike to the freestanding tall structure can be estimated by the equivalent exposure area and ground flash density. The calculated result is compared with the measured results and both results are consistent.

关 键 词：雷击 高结构体 等值受雷面积 

分 类 号：TM865[电气工程—高电压与绝缘技术]