四川±500 kV德宝线雷击高风险杆塔防雷改造设计

Lightning Protection Design for Tower and Pole with High Risk of Lightning Stroke in ±500 kV Sichuan Debao Line

随着直流输电线路的大规模建设,输电距离和输送容量已有相当规模,雷害防治是直流输电线路运维管理面临问题中的重点和难点。四川±500 kV德宝直流输电线路沿线地形复杂,雷击闪络尤为明显。对四川±500 kV德宝线运行至今雷击跳闸数据统计,结合线路走廊地闪密度,采用输电线路差异化防雷评估技术,筛选出20基雷击高风险杆塔,并提出防雷改造方案,为运维部门后期开展防雷工作提供一定的参考和依据。

With the large - scale construction of HVDC transmission lines, the transmission distance and transmission capacity has a considerable size, and the lightning damage prevention is an important and difficult point facing by the operation and ma- intenance management of DC transmission lines. ± 500 kV Sichuan Debao DC transmission line is along the terrain, so the lightning flashover is particularly evident. The data statistics of lightning trip - out in ±500 kV Sichuan Debao DC transmission line is carried out from it being put into operation till now. Based on the lightning density of line corridor, 20 towers and poles with high risk of lightning stroke are screened based on differential protection evaluation technique against lightning for transmission line, and the improvement for protection scheme against lightning is put forward, which can provide a reference for developing the lightning protection by the operation and maintenance departments.