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.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
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)~~
