【摘要】 雷击高压直流线路杆塔时,由于预先存在的直流工作电压对杆塔间隙的电气强度可能带来较大的影响,因此线路的耐雷性能与交流情况的不同。作者建立了雷击直流线路杆塔时的线路模型、杆塔模型、闪络判据等,采用仿真软件PSCAD/EMTDC对雷击直流线路杆塔的过电压和闪络进行了仿真分析,讨论了各种运行方式下直流工作电压对线路耐雷性能的影响。仿真分析结果表明:+500kV单极-金属回线运行与双极±500kV运行时,正极线的耐雷水平基本相同,负极线的耐雷水平远高于正极线;-500kV单极-金属回线运行时线路的耐雷水平最高。更多还原

【Abstract】 When the tower of HVDC transmission line is struck by lightning, the lightning withstand level of HVDC transmission line is different from that of AC transmission line, because the DC working voltage might have great effect on electric strength of tower gap. Here, the line model, tower model, criteria of flashover under the tower of HVDC transmission line being struck are established, and by use of simulation software PSCAD/EMTDC the overvoltage and flashover under the tower of HVDC transmission line being struck are simulated, and the impacts of working voltage of HVDC transmission line on lightning withstand performance under various operating modes are researched. Simulation results show that the lightning withstand level of positive line under +500kV monopolar mode is almost same as that under bipolar mode; the lightning withstand level of negative line is far higher than that of positive line; and the lightning withstand level under-500kV monopolar mode is the highest.更多还原