±800kV直流输电线路Z型边坡塔结构特性研究  

Research on the Characteristics of Z-Type Slope Transmission Tower for ±800kV UHV Lines

作　　者：于建伟 潘峰[2] 谢芳[3] 宋刚[2] 王轶文[2] 

机构地区：[1]中国水利水电第四工程局有限公司国际公司,北京100070 [2]中国能源建设集团浙江省电力设计院有限公司,浙江杭州310012 [3]绍兴文理学院元培学院,浙江绍兴312000

出　　处：《中国电力》2015年第12期141-147,共7页Electric Power

摘　　要：针对特高压直流线路所经山区雷电活动频繁,大地屏蔽作用差,提出一种适用于山区直流特高压输电线路的Z型边坡塔。与常规T型塔相比,Z型边坡塔对左右两极导线横担进行阶梯布置,降低下山坡侧的导线横担对地高度,充分利用杆塔有效高度,降低雷击跳闸率,提高特高压直流线路耐雷水平。通过通用有限元软件对铁塔结构的内力分布进行了线性和非线性分析,并以塔重和混凝土等指标对比分析Z型塔的经济可行性,研究揭示了Z型塔的结构受力特点,结果表明,铁塔内力与T型塔相当,工程造价与T型塔基本一致,可为Z型塔在多雷山区特高压直流线路中的应用提供参考。UHVDC Transmission lines usually crosses the mountainous areas, where lighting activities are frequent and the earth shield function is poor. This paper presents a new tvpe of tower called Z-type slope tower, which is suitable for UHVDC Transmission lines in mountainous areas. Compared with the conventional T-type tower, the slope tower has the conductor cross arms for both polar conductors arranged in step, which can reduce the distance from conductor to ground and make full use of the effective height of the tower to reduce the shielding failure trip out rate and improve the lightning withstand level of UHV DC transmission lines. An analysis is made on the linear and nonlinear internal force distribution of the tower structure by using the finite element analysis software. The economic feasibility of the Z-type slope tower is also studied through comparative analysis of the tower weight and the amount of concrete. The results show that the inner force of the Z-type slope tower is almost the same as that of the T-type tower, and the project cost is consistent. This paper provides a basis for the application of the Z-type slope tower in UHVDC transmission lines in the heavy lightning mountainous area.

关 键 词：直流输电线路 特高压 Z型边坡塔 非线性 内力分布 

分 类 号：TM75[电气工程—电力系统及自动化]