±800kV特高压直流输电线路电磁干扰研究

Research of Electromagnetic Interference for ±800 kV UHVDC Transmission Line

直流输电线路在正常电压运行下允许一定程度的电晕放电,电晕放电产生电晕损失,引起无线电干扰及可听噪声。分析了±800 kV特高压直流输电线路的无线电干扰及可听噪声,采用逐步镜像法计算导线表面电位梯度,分析无线电干扰及可听噪声的计算方法,编写计算程序,计算结果表明:改变导线截面、导线对地高度、分裂间距及导线分裂数可降低无线电干扰及可听噪声的水平。

Under normal voltage operation DC transmission line allows a certain degree of corona discharge,which causes corona loss and leads to radio interference and audible noise. This paper analyses the radio interference and audible noise of ±800 kV UHV dc transmission lines,using successive image method to calculate the conductor surface vohage gradient, analyzing the calculation methods of radio interference and audible noise,and compiling calculation program. The calculation results show that the radio interference and audible noise level are reduced by the conductor cross section, conductor height, bundle spacing and split conductor number.