750kV同塔双回线路导线选择研究

Study on Conductor Selection of the 750 kV Double-circuit Transmission Tower

750kV兰州东—平凉—乾县送电工程是我国第1条750kV同塔双回线路,导线选择是重要的课题之一。根据导线选择的主要原则和西北地区高海拔的特点,结合该工程采用的塔型,对各种分裂导线方案,进行了导线表面电场强度、无线电干扰、可听噪声以及相关导线型号的工程造价水平、年运行费用的比较,建议该工程导线采用6×JL/GIA-450-54/7方案。

Conductor selection is an important task for the east Lanzhou-Pingliang-Qian County 750 kV double-circuit transmission tower project, which is the first 750 kV double-circuit transmission line in China. Based on the major principles of conductor selection and high altitude characteristics of northwest region, the authors compared different bundle conductor schemes in such aspects as conductor surface electric-field strength, radio interferences, and audible noises, as well as project costs and annual operating costs. Suggestion was made that 6×JL/GIA-450-54/7 conductor scheme should be used.