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介绍了一种牵引网悬挂导线雷击率的算法,该算法用取向角概率密度函数来考虑下行先导发展路径的随机性特征,并计算了取向角上、下限函数。根据雷电流的概率密度函数在悬挂导线受雷曲面上积分确定等值受雷面积,再由等值受雷面积和地面落雷密度确定雷击率。基于该算法,在MATLAB中进行了编程计算并应用到一个实例。此外,还分析了导线高度和雷击距系数对雷击率的影响,并将本文计算结果与先前报道计算结果作了对比。结果表明,在考虑导线高度和雷击距系数影响后计算结果与先前报道结果相比差别较大。
This paper introduces an algorithm for the lightning strike rate of the suspension wire of traction network. The algorithm takes the probability density function of orientation angle to consider the random characteristic of the downlink pilot path, and calculates the upper and lower limit functions of orientation angle. According to the probability density function of lightning current, the lightning conductor area is determined by the integral of the suspended conductor on the lightning curved surface, and then the lightning strike rate is determined by the equivalent lightning area and ground lightning densities. Based on this algorithm, a programming calculation is performed in MATLAB and applied to an instance. In addition, the effects of conductor height and lightning stroke distance on the lightning strike rate are also analyzed. The calculation results of this paper are compared with those of previous reports. The results show that the calculated results are greatly different from the previous results after considering the influence of conductor height and lightning strike distance coefficient.