±800kV特高压直流输电线路工程导线选型

摘要

导线选型是±800 kV特高压直流输电线路设计中的关键课题之一,对工程造价和安全运行有着十分重要的意义.从载流量、电场强度、离子流密度、无线电干扰、可听噪声5个方面分析了导线的电学特性；从过载能力、弧垂特性、荷载情况等方面比较了导线的机械特性；总结以往工程经验,分析了导线的经济电流密度和经济性,为今后工程提出了一些建议.%The conductor scheme is one of key issues in the designing of the UHVDC transmission project, and it is also significant to the construction cost and the safe operation of the transmission line. In this paper, the electrical characteristics are analyzed in terms of the current-carrying capacity, electric field strength, ion current density, radio interference strength and audible noise while the mechanical characteristics analyzed in terms of the overload capabilities, sagging characteristics and load conditions. Based on the experience in the previous projects, the paper elaborates the economic current density and economic characteristics of the project.It offers some suggestions for the later projects.