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导线选型及分裂方式的确定是发展±1 100 kV特高压直流输电工程的关键技术之一,对线路的可靠运行、环境保护和控制工程投资至关重要. 采用国际公认的、经过实际工程验证且广泛使用的计算分析方法,研究了±1 100 kV直流输电线路的结构参数(导线分裂数、子导线截面、导线分裂间距、极导线对地高度和极导线间距)对合成电场、可听噪声和无线电干扰场强的影响;对不同的导线方案进行了经济性比较. 根据电磁环境预测分析及经济比较结果,确定了±1 100 kV直流输电线路的导线结构.“,”Determination of conductor type selection and bundle structure is one of the key technologies for developing ±1 100 kV UHVDC transmission line projects, which is of vital importance to the reliable operation of transmission lines, the environ-mental protection and the control of project investment.Employing the internationally recognized, practically verified and widely used calculation and analysis methods, the influence of the structure parameters of ±1 100 kV UHVDC transmission lines, such as splitting number, sectional area of sub-conductors, splitting-wire spacing, conductor elevation to the ground and pole conductor distance, on total electric fields, audible noise and radio interference filed intensity is studied.The eco-nomic comparison is carried out with regard to different conductor schemes.Finally, the conductor structure of ±1 100 kV UHVDC transmission lines is determined on the basis of electromagnetic environment forecast analysis and economic compari-son results.