±1 100 kV输电线路作为我国新的电压等级输电线路，其导线对地及交叉跨越距离对工程造价影响较大，是线路设计关键技术原则之一。参考±800 kV特高压直流输电线路的设计、运行经验，给出了±1 100 kV特高压直流输电线路的导线对地及交叉跨越距离的确定原则。在导线不同截面及分裂数、分裂间距、极间距及对地高度时，进行了电场效应计算分析。在此基础上，结合±800 kV特高压直流输电线路的设计、运行经验，给出了±1 100 kV输电线路的导线对地及交叉跨越距离和走廊宽度，可为工程设计提供参考。

As a new voltage class in China, the ground clearances and crossing clearance of the ±1 100 kV transmission line have significant impacts on project cost, which is one of the key technical principles in transmission line design. Based on the design and operation experience of ±800 kV UHVDC transmission line, the determining principle was suggested for the ground clearance and crossing clearance of conductors in ±1 100 kV UHVDC transmission line. The electric field effects were calculated and analyzed at different section of conductors with different split number, split spacing, electrode spacing and ground clearance. In the end, combined with the design and operation experiences of ±800 kV HVDC transmission line, this paper presented the crossing clearance and corridor width of conductors in ±1 100 kV UHVDC transmission line, which could provide reference for further engineering design.