Abstract
Aging characteristics of conductor surface of ultra-high voltage direct current (UHVDC) power transmission lines have a large influence on ground-level resultant electric field. A method to analyse the impact of the aged conductors on resultant electric field is introduced in this paper. Firstly, the surface profile and surface roughness of the new and aged conductors are measured by scanning electron microscopy and three dimensional phase shift Micro-Xam. Then, an indoor corona cage is set up to determine the roughness factor of the aged conductor. A time-domain finite volume method (FVM) is introduced to analyse the influence of aging characteristics of conductor surface on resultant electric field. Finally, the ground-level resultant electric field and ion current density of a typical ± 800kV UHVDC power transmission line are calculated and analysed. The result shows that the surface roughness factor of the aged conductor is much lower than that of the new conductor, and the groundlevel resultant electric field and ion current density are stronger than that of the new one.
Published Version
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