特高压大跨越导线选型研究

大跨越工程的导线选择是大跨越工程设计中的关键,因为导线的特性决定跨越塔的高度和运行张力,也决定电能输送性能。文章主要从电气特性、机械特性和投资分析3个方面对各种导线截面积和分裂型式进行了详细的技术经济比较,选择出在技术上和经济上最优的导线截面积和分裂型式,为选定工程的导线方案提供依据。同时要注意,在进行大跨越导线选型时要考虑其与线路其他部分的一致性和交流系统的发展裕度。通过分析计算,文章对“十一五”期间国家电网公司重点建设的1000kV晋东南—南阳—荆州特高压交流输电试验示范工程和淮南—芜湖—浙北—沪西特高压输变电工程的大跨越导线均推荐了2组导线。

Study on Selection for Conductors of Large Span in UHV

Conductor optimization is the key in large span design. Conductor characteristic has decided height and stress of crossing tower, also decided the electrical energy transportation performance. This paper carried out the detailed technical economy comparison from the three aspects of electrical specification, physical characteristics and the investment analysis, and the most superior conductor section and the bundle pattern in the technology and economy were selected. The results provided the base of conductor optimization for the project. At the same time, the margin of AC system development should be considered. Through the calculation and analysis, the paper recommended two groups of large span conductor for 1000 kV Jindongnan-Nanyang-Jinzhou and Huainan-Wuhu-Zhebei-Huxi UHVAC transmission trial projects.