Conversion of AC multi-circuit lines to AC-DC hybrid lines with respect to the environmental impact

New corridors for high power transmission are needed in Central Europe. DC Transmission is favoured for distances above some hundred kilometres. The conversion of AC Circuits of existing Overhead lines to DC Circuits is of major interest to minimize the overall environmental impact of the transmission system and to facilitate the acquisition of new right-of-ways for new line corridors. Theoretical and experimental studies were performed to show the feasibility of the conversion of one 380 kV AC Circuit of an existing multi-circuit line to DC. The results related to the dielectric performance and electric field issues are presented. It is concluded that a DC link for long distance power transmission from the north to the south of Central Europe can be established by conversion of existing…