Influence factors analysis of ionized field characteristics of Zhangbei ±500kV flexible direct current transmission lines

The ionized field should be controlled in order to insure the environmental friendliness of high voltage direct current (HVDC) transmission lines. Different with traditional HVDC lines, metal return lines is first employed Zhangbei ±500kV flexible In this paper, characteristics and without are calculated on basis numerical method Deutsch’s assumption. influence factors, i.e. roughness coefficient, distance between line height line, analysed detail. results show that will have a shield effect ground. distribution nearly independent line. shielding mainly contributes projection position presented can give instructions for design control level