雷电定位系统测量的雷电流幅值分布特征

为满足防雷工程技术对雷电定位系统所测大量雷电流参数的应用需求,在IEEE工作组和国内电力行业规程中采用的雷电流幅值概率分布特性的基础上,通过统计我国典型雷电定位系统监测数据研究了雷电流幅值分布特征。结果表明:采用IEEE推荐的表达形式回归雷电定位系统测量的雷电流幅值累积概率曲线拟合性最好,其结果与IEEE推荐雷电流幅值分布特征符合,与我国当前规程中推荐的曲线有交叉,小幅值部分累积概率值高出规程值20%,大幅值部分累积概率值略小,与高压架空输电线实际雷击绕击跳闸率比设计值偏高相符合。

Distribution Characteristics of Lightning Current Magnitude Measured by Lightning Location System

To satisfy the application demands of vast lightning current parameters in lightning protection engineering technology, the distribution characteristics of cumulative probability of lightning current magnitude adopted by IEEE working group and national power industry regulations are analyzed,and the distribution characteristics of lightning current magnitude in some typical areas based on lightning location system's data are studied. The results show that: the fitting expression format adopted by IEEE is better for cumulative probability curves gotten from lightning location system than that adopted by national power industry regulations,the characteristics of the statistical curves accord with that recommended by IEEE, in two sides of the crossing point, the cumulative probability values at smaller currents are 20% higher than the latter, and the cumulative probability values at higher currents are somewhat smaller than the latter, which is accordant with that the actual shielding failure rates of high voltage overhead transmission lines are higher than design values.