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雷电流幅值概率计算公式

, PP. 161-167

Keywords: 累积概率,概率密度,规程法,IEEE标准

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Abstract:

雷电流幅值概率是表征雷电活动频度,计算雷击闪络率的必要参数。通过累积概率函数和概率密度函数比较了实际雷电流幅值分布和规程中概率分布公式计算结果,发现实测值所对应的雷电流幅值概率和规程法公式存在很大的差异,该差异随雷电流幅值的减少而增大。通过比较实测值和IEEE标准推荐公式等其他类似公式,认为上述公式与实测雷电流概率分布具有相同的变化趋势,但二者在幅值上存在较大的差异。在IEEE标准推荐公式及其他公式的基础上,文中拟合了计算雷电流幅值概率的计算公式,探讨了所推公式中的系数对曲线形状的影响,给出了系数的取值范围并对工程上的取值给出了建议。最后采用其他地区的雷电流幅值实测数据对所推公式适用性进行验证。

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