特高压线路的避雷线保护范围设计

目前,在特高压线路的避雷线保护范围设计中,仍采用传统的不考虑特高压导线电压影响的方法,可能使特高压线路避雷线的实际保护范围满足不了高可靠性防雷设计的要求。为了解决这一问题,在特高压线路的避雷线保护范围设计中,考虑特高压导线电压的影响,提出以特高压导线的最小对地空气间隙距离为半径,构成特高压导线的等效绝缘截面,并设计该等效绝缘截面位于避雷线的保护范围之内。计算结果表明,若不考虑特高压导线电压的影响,特高压线路的避雷线保护范围将存在严重的安全隐患。

Design on the lightning protection coverage of the lightning shield conductor for UHV transmission line

The lightning protection design for UHV transmission line still adopts the traditional method without consideration on the influence of UHV conductor voltage currently, which may result that the actual protection coverage of the lightning shield conductors of UHV transmission line cannot meet the requirements of high-reliability lightning protection design. To take into consideration the influence of UHV conductor voltage on the lightning protection coverage design of UHV transmission lines, a new method was presented to make the minimum conductor-to-ground air clearance the radius for forming the equivalent air insulation section of UHV conductor. This equivalent air insulation section was designed into the coverage of the lightning protection line by this new method. The calculation shows that the lightning protection coverage of the lightning shield conductor will contain severe safety troubles if without consideration on the influence of UHV conductor voltage.