±1100kV特高压直流输电线路电磁环境研究

Research on Electromagnetic Environment of ±1100kV UHVDC Transmission Lines

研究特高压直流输电电磁环境问题对我国特高压工程建设具有重要意义。根据±1 100kV特高压直流输电线路电磁环境限值,按照给定的初始条件,采用模拟电荷法、有限元法、CISPR、EPRI经验公式等方法计算合成场强电场、地面离子流密度、磁场强度、无线电干扰和可听噪声等电磁环境参数。研究表明,可听噪声是导线选型的控制因素。根据不同的极间距和海拔高度情况,推荐相应的导线型式,并给出不同导线型式推荐的导线最小对地距离。

Study of the electromagnetic environment of UHVDC transmission lines is very important for construction of UHVDC transmission lines in China.Several methods,including charge simulation method,finite element method and formula of CISPR and EPRI,are used to calculate the relevant parameters,such as total electric field,ion current density,magnetic field intensity,radio interference and audible noise.The calculation is based on the limits of electromagnetic environment of ±1 100 kV UHVDC transmission lines and the given initial conditions.The research result shows that the audible noise is the controlling factor for selecting conductor types.Various conductor types are recommended according to different pole intervals and altitudes in this paper and the minimum ground clearance of different conductor types are also given.