山区超高压线路新型杆塔设计研究

Late-model Tower Design of EHV Transmission Lines in Mountainous Areas

对于山区500 k V超高压线路,山地坡度大,铁塔呼称高易受边导线对地距离的控制,使得铁塔过高,线路造价也大大增加。以智圣—鲁中500 k V线路工程为依托,针对500 k V超高压单回线路在山区的特点,综合考虑绝缘子金具串型式、塔头规划、电磁环境、防雷性能、铁塔塔重、铁塔受力情况等各方面的因素,并重点借鉴干字型塔受力特点,设计了下字型直线塔。通过对下字型直线塔在山区地形、走廊紧张地区、单双回路分歧时、与其它塔型连接时适用性的分析,并与常规直线塔的技术经济比较,论证了在山区采用下字型直线塔时,超高压交流线路的设计更加安全可靠、经济合理。

The height of 500 kV transmission line tower in mountainous areas is usually determined by the clearance between wire and ground,which leads to greater tower height and increases the cost of the EHV transmission lines.On the basis of actual 500kV transmission line project from Zhisheng substation to Luzhong substation,the late-model supporting tower is designed considering mountain transmission line features ,including the type of insulator fittings ,layout of tower head ,electromagnetic environment,lightning protection,tower weight and stress.Also,during the design process of the late-model tower,the outstanding stress performance of branching tower was especially studied for reference.Compared with normal tower,.when iate- model tower is used in mountainous areas, narrow corridor areas or when connected with double-circuit tower and other kind of tower,from the aspect of reliability and economy, it is preferable to adopt the late-model tower.