The study on the radio interference from ±800kV Yun Guang UHVDC transmission line

The radio interference is one of the important electromagnetic environment parameters for UHV DC transmission line. This paper validates the radio interference calculating formula of DC transmission line recommended by CISPR though measured data from three 500 kV DC transmission lines that have been built in China. The radio interference from plusmn800 kV Yun Guang UHVDC transmission line with different types of conductors, height of conductors above the ground ,and different space between anode and cathode line is calculated using CISPR's formula. It is concluded that the radio interference level of plusmn800 kV Yun Guang UHVDC transmission line should be limited in 55~58 dB(muV/m), and the conductor section of line should be chosen 5times720 or more.