750kV单回和同杆双回输电线路反击耐雷性能

利用ATP-EMTP仿真程序对单回和同塔双回750 kV输电线路典型杆塔的反击耐雷性能及其影响因素进行了仿真计算研究。研究中杆塔采用了多波阻抗模型,考虑了雷电波在杆塔中的传播速度、杆塔呼称高度及杆塔接地电阻等因素的影响,采用统计法确定750 kV超高压线路的反击耐雷性能。研究结果表明:杆塔中的传播速度影响不可忽略;随着杆塔高度的降低,冲击接地电阻的减小,线路反击性能增强;导线排列方式和档距的变化,对线路反击性能影响很小;对于ZB329和ZGU315型杆塔,仅其单回反击跳闸率都会高于预期雷击跳闸率,因此在建设750 kV输电线路时,需要认真计算研究输电线路的反击耐雷性能。

Lightning Protection of Back Striking for 750 kV Single Circuit and Double Circuit Transmission Line

This paper calculates and researches on lightning protection performance of back striking and influence factors for typical towers of 750 kV single circuit and double circuit transmission lines by ATP-EMTP.With towers using multi-wave impedance model and considering factors such as propagation velocity of the lightning wave through the tower,height of tower and grounding resistance etc,a statistical method determines lightning protection performance of back striking for 750 kV supernigh voltage transmission line.Research results show that the effect of propagation velocity of the lightning wave through the tower shouldn't be neglected;along with the reduction of both tower height and surge grounding resistance,the back striking withstand performance enhances;the effect of the arrangement manner of line and lines distance on the back striking withstand performance is very little;only trip-out rate of back flashover of single circuit of the tower of ZB329 and ZGU315 exceeds anticipation lightning trip-out rate,so it is necessary to seriously calculate and research on lightning protection performance of back striking for transmission line when 750 kV transmission lines be constructed.