1000kV/500kV特、超高压同塔4回交流输电线路雷电性能仿真分析  

Lightning Performance Simulation of Quadruple-circuit Transmission Line with Dual Voltage 1000 kV/500 kV on the Same Tower

作　　者：范冕[1] 万磊[1] 戴敏[1] 何慧雯[1] 李志军[1] 谷定燮[1] 

机构地区：[1]中国电力科学研究院,武汉430074

出　　处：《高电压技术》2013年第3期584-591,共8页High Voltage Engineering

基　　金：国家发展和改革委员会专项项目(GJ09011)~~

摘　　要：为准确评估1 000kV/500kV超特高压同塔4回输电线路的雷电性能,基于电磁暂态程序(EMTP)和改进后的电气几何模型(EGM)分别对这种线路的反击、绕击耐雷水平及雷电跳闸率进行了仿真研究。分析了同塔多回线路中500kV线路不同相序排列、不同间隙长度及不同杆塔冲击接地电阻对反击跳闸率的影响,并对比计算了1 000kV线路不同绝缘子串布置方式下线路的雷电绕击性能。最后根据研究结果,指出了500kV线路的绝缘配合是1 000kV/500kV混压同塔4回线路防雷的薄弱点所在,并提出通过加强500kV线路的绝缘水平、优化1 000kV线路绝缘子的布置方式等措施,能有效改善线路雷电性能、降低雷击跳闸率,可用于指导工程设计。In order to accurately assess the lightning performance of quadruple-circuit transmission line with dual UHV and EHV 1 000 kV/ 500 kV on the same tower,the back flashover trip-out rate,shielding failure trip-out rate,and lightning withstand level of lines were calculated and analyzed by using electro-magnetic transient program（EMTP） and the improved elector-geometrical model（EGM）.The influences of the phase arrangement for 500 kV lines,the air gap length of 500 kV lines and the impulse ground resistances of towers on the back flashover trip-out rate were analyzed.Meanwhile,the influences of the different insulator string layouts for 1 000 kV lines on the shielding failure performance were compared and calculated.It was concluded that the weak points of the lightning protection for a quadruple-circuit transmission line with dual voltage 1 000 kV/500 kV on the same tower was the insulation coordination of 500 kV transmission lines.Furthermore,we found that the lightning performance of transmission line could be improved and the lightning trip-out rate could be reduced by enhancing the insulation level of 500 kV transmission lines or optimizing the design of the layout of 1 000 kV transmission line’s insulators.The conclusions can provide guidance for the enqineering design.

关 键 词：1000kV 500kV 同塔4回输电线路 电磁暂态程序 电气几何模型 雷击跳闸率 耐雷水平 

分 类 号：TM863[电气工程—高电压与绝缘技术]