南昌--长沙特高压交流输电线路雷电防护性能评估

Evaluation of Lightning Protection Performance of Nanchang Changsha UHV AC Transmission Line

特高压线路由于其杆塔高,相对普通线路更易引雷,特高压线路雷电防护性能研究对确保特高压线路安全具有重要意义。基于南昌-长沙特高压工程实际,分析了线路历经区段地形、雷电活动以及杆塔特点,基于线路典型杆塔,对特高压线路的雷电防护性能开展分析。建立特高压线路雷电防护电气几何模型与电磁暂态模型,分析地面倾角、杆塔呼高、接地电阻、塔型等因素对线路反击耐雷能力与绕击耐雷能力影响规律。基于防雷性能评估结果提出线路防雷运维指导建议,为特高压线路安全提供保障。

Because of high towers,UHV line is easier to attracting lightning than ordinary line.The research on lightning protection performance of UHV line is of great significance to ensure the safety.Based on the Nanchang——Changsha UHV project,this paper analyzes characteristic of terrains,lightning activities.Based on the typical tower,this paper analyzes the lightning protection performance of UHV line.The electrical geometric model and electromagnetic transient model of lightning protection for UHV line are established,and the influence of ground inclination,tower height,grounding resistance,tower type and other factors on line counterattack lightning performance and shielding lightning performance are analyzed.Based on the lightning protection performance evaluation results,the guidance suggestions for line lightning protection operation and maintenance are put forward to provide a guarantee for the safety of UHV lines.