高耸建筑群对10kV配电线路感应雷雷击特性的影响

Analysis of Influence Tall Buildings’ on the Induced Lightning Characteristics of 10kV Distribution Lines

为了分析高耸建筑物如何降低雷击时10 kV配电线路感应雷过电压,首先根据珠江三角洲某镇10 kV配电线路雷击故障点分布情况,统计出建筑密集的城市区雷击故障点数要明显少于郊区。其次,根据电气几何模型原理和雷电先导发展阶段的电场分析得出建筑物高度越高、上表面横截面积越大,建筑材料的介电常数越大建筑物对10 kV配电线路的屏蔽效果越好。最后,通过ANSYS仿真分析出无建筑时导线周边电场畸变比有建筑时严重的结论,进一步证明建筑物对10 kV配电线路遭受感应雷过电压具有屏蔽和保护作用。

In order to analyze how tall buildings reduce induced lightning overvoltage of 10 kV distribution lines, firstly it is figured out that the number of lightning fault points in building intensive downtown areas is obviously less than that in suburbs, according to the statistics of distribution situation of lightning fault points on 10 kV distribution lines in a town in the Pearl River Delta. Secondly, based on the electrical geometry model principle and electric field analysis in the lightning leader stage of development, the result shows that the higher the buildings, the greater the cross-sectional area, the greater the dielectric constant of building materials, the better shielding effect of the buildings to 10 kV building distribution is. Finally, with the conclusion is obtained that electric field of the wires without buildings around has a more serious distortion than that with buildings around through the ANSYS simulation, it is further proved that buildings can shield and protect 10 kV distribution lines from induced lightning overvohage.