输电线路走廊雷电流幅值分布统计方法

发布时间：2018-04-18 21:21

本文选题：雷电流幅值 + 累积概率分布　；参考：《高电压技术》2017年05期

【摘要】：雷电参数沿线路呈现显著的差异性,单一的雷电流幅值累积概率分布公式不足以准确反映长线路走廊的实际情况。为进一步提高线路耐雷性能分析的精细化程度,提出一种精细化雷电流幅值累积概率分布统计方法。该方法在"网格法"基础上,根据网格雷电地闪次数逐步合并网格形成不同统计区段,分别统计拟合得出各区段内的雷电流幅值累积概率分布公式。研究结果显示以地闪2 000次为阀值划分统计区段较合理。采用分区段的雷电流幅值分布公式和全线路单一的分布公式相比较,两者造成110 kV杆塔反击跳闸率的差异达 0.093~0.181次/(100 km·a),而220 kV和500 kV杆塔的反击跳闸率差异较小;对500 kV杆塔的绕击跳闸率,在地面倾角不足10°时影响可忽略不计,在地面倾角为30°时差异达 13.2%~6.2%。
[Abstract]:There are significant differences in lightning parameters along the road, and the single formula of cumulative probability distribution of lightning current amplitude is not enough to accurately reflect the actual situation of long line corridor.In order to improve the precision of lightning performance analysis, a statistical method of cumulative probability distribution of lightning current amplitude is proposed.On the basis of "grid method", according to the number of lightning lightning flashes in the grid, different statistical sections are formed, and the cumulative probability distribution formula of lightning current amplitude in each section is obtained by statistical fitting.The results show that it is more reasonable to divide the statistical section with the threshold of 2 000 times of ground flash.By comparing the lightning current amplitude distribution formula of each section with the single distribution formula of the whole line, the difference of counterstrike tripping rate of 110 kV tower is 0.093% 0.181 times / 100 km / a, but the difference between 220 kV and 500 kV tower is relatively small.For 500 kV tower, the effect of tripping rate can be neglected when the inclination angle is less than 10 掳, and the difference is up to 13.2and 6.2 when the slope angle is 30 掳.
【作者单位】：南瑞集团公司(国网电力科学研究院);国网电力科学研究院武汉南瑞有限责任公司;国网浙江省电力公司金华供电公司;
【基金】：国家电网公司科技指南项目(5211JH1500X7)~~
【分类号】：TM863

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