高电压等级紧凑型输电线路由于电压等级高、相间距离短，其电磁环境一般不够友好。由于子导线之间的互相影响，子导线在等圆周排列情况下的表面电场分布并不均匀。这种不均匀性增大了相导线的最大表面电场强度，进而增大了线路的无线电干扰与可听噪声。通过改变子导线排列方式改变子导线之间的相互影响程度，优化导线的表面电场强度分布，进而改善了线路的电磁环境。同时，对子导线优化排列方式对电气参数的影响进行了探讨，所得结论对我国超高压紧凑型输电线路的建设具有一定的借鉴意义。

The electromagnetic environment of 750 kV compact power transmission lines is not friendly due to its high voltage,short phase distance and high altitude.Generally speaking,as a result of the interaction of sub-conductors,the electric-field distribution on surfaces of sub-conductors equally arranged at circumference is nonuniform.The heterogeneity increases the electric field intensity on maximum surface of phase conductor,so that the radio interference and audible noise of the transmission line are increased.Therefore,the electromagnetic environment is improved by changing the arrangement of sub-conductors.The influences of optimized sub-conductors arrangement on the electric parameters of the transmission line are also discussed.The results obtained will provide references to the construction of UHV compact power transmission lines in our country.