基于引雷空间理论的水平接闪器年雷击率预测方法

Calculation method for protective effect of plane rod based on attractive volume theory

介绍了一种基于引雷空间理论的水平接闪器年雷击率的预测方法。该方法考虑了水平接闪器的引雷空间域和雷电下行先导随机取向角的影响,加权处理了不同雷电极性下的等值受雷面积,根据等值受雷面积和地面落雷密度对水平接闪器的年雷击率作出预测,该方法明显改善了定量计算精度和有效性,预测结果与实测结果基本一致。

This paper proposes a new method for calculating the annual frequency of lightning strikes to buildings protected by plane net, In this method, the attractive volume of a plane rod is defined in terms of the lightning polarities. The exposure area is located inside the attractive volume according to the striking distance. In order to obtain the equivalent exposure area of the plane rod. the integral of the probability density function is performed on the exposure surfaces with respect to downward leader approach angle and striking distance. Finally the annual frequency of lightning strikes to the plane rod is estimated. The method considerably improves the accuracy and validity of quantitative calculation; the estimated outcome is very close to the measured results,