The electromagnetic environmental effect of ±800 kV UHVDC transmission lines is numerically investigated in this paper.The CDEGS software package is employed for the numerical simulation.Pole conductor horizontal arranged ±800 kV UHVDC transmission lines models are studied.The distributions of nominal electric field
total electric field
radio interference and audible noise are calculated.The influence of the height of phase conductors
wire spacing
the sectional area of the subconductors on the above parameters are analyzed.The effect of height above sea level and single pole operation mode are also investigated.