交流1 000 kV同塔双回线路电气不平衡度研究

依据现行国家标准、规程、规范，依托1 000 kV锡盟—南京特高压交流工程，参考国内750 kV、500 kV同塔双回输电线路的研究成果及运行经验，通过分析计算线路电气不平衡度，确定1 000 kV锡盟—南京特高压交流输电线路采用1个整循环的换位方式。文中还研究了线路长度、换位点、导线对地距离、线间距离、输送功率运行电压对线路不平衡的影响，并与750 kV、500 kV线路的不平衡度进行了比较，给出不同电压等级线路在达到限值要求时的线路长度。该研究成果可应用于工程设计。

Research on Electrical Imbalance of the 1 000 kV AC Double-Circle Line on the Same Tower

According to the current national standards, procedures and norms, and based on the actual engineering experience in the 1 000 kV Ximeng - Nanjing UHV project as well as the research achievements and operation experience of the 750 kV and 500 kV double-circuit transmission lines on the same steel tower, through analysis and calculations of the electrical imbalance, the transposition of one entire cycle is used in the 1 000 kV Ximeng-Nanjing UHV transmission project. This paper introduces the design, studies impacts of the line length, the transposition point, height of the conductor above ground, conductor-to-conductor gap, transmission power and the operating voltage on the line imbalance, and compares the project's imbalance with those of the 750 kV and 500 kV transmission lines, giving the line lengths of different voltage lines when the limit is reached. The research results contained in the paper can be applied in the actual engineering design.