Study on Electromagnetic Environment Characteristics of Parallel UHV AC Transmission Lines

Abstract

In regions where transmission corridors are badly needed, UHV lines will inevitably be constructed in parallel with other UHV or EHV lines. Hence, the electromagnetic environment characteristics near the corridors are complex and in-depth study should be carried out. In this paper, three models of parallel AC transmission lines are established, and the characteristics of the power frequency electromagnetic field, radio interference and audible noise near the parallel lines are studied. The results show that as the line spacing decreases, the area of strong electromagnetic environment reduces, but the amplitude will increase. The height of the parallel-erected line has more influence on the distribution of the power frequency electromagnetic field than the radio interference and audible noise. Generally, the electromagnetic environment generated by the parallel erection of UHV transmission lines is related to the conductor height and the spacing of parallel lines. When the radio interference and audible noise limits are up to standard, the spacing of parallel erection lines can be appropriately reduced. This study has a certain reference significance for the design and construction of UHV lines in areas being short of corridors.

Keywords

• uhv ac transmission lines
• parallel erection
• electromagnetic environment
• line spacing
• ground height