导线选型是超高压输电线路设计的关键技术之一,对线路的输送容量、传输性能、电磁环境以及输电线路的技术经济指标都有很大的影响.为经济合理地选择导线截面、导线结构和极导线布置,针对9种+660 kV直流输电线路的导线方案,采用广泛使用的计算分析方法,从电流密度、电场效应、电晕损失、无线电干扰及可听噪声等方面阐述各种导线方案的电气特性,并采用最小年费用法对导线方案进行经济性比较,确定宁东-山东+660 kV直流输电线路的极导线结构方案.建议在2000m以下的低海拔工程中,双回路采用6×LGJ-630/45导线方案,分裂间距45 cm；单回路采用4×LGJ-800/55导线方案,分裂间距45 cm.%Type selection of cables is one of key technologies in EH V DC transmission line design with a very big effect on the transmission capacity, performances, electromagnetic environment and economic indexes. In order to achieve the best selection of wire types, structures and pole configurations, nine kinds of wiring schemes for ±660 kV DC transmission lines were analyzed. The electrical characteristics including current density, field effect, corona losses, radio interference and audible noise were compared. The pole configuration of the ±660 kV DC transmission line between Ningdong and Shandong was designed by minimum yearly cost method. It was suggested that in low altitude projects with the elevation of 2 000 meters below, the line of 6 ■ LGJ-630/45 with a split spacing of 45 cm should be adopted in a double-circuit and the line of 4* LGJ-800/55 with a split spacing of 45cm in a single-circuit.
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