UHVDC transmission with dedicated metallic return

High voltage DC Transmission has been alternatively used for large amount of bulk power point to point transmission over long distance. Recent advancement in converter technology has further increased the power carrying capacity of transmission even more. Most of these projects uses Earth electrode as a return path, during the operation DC ground potential rises which sometime has adverse effects on buried objects. Most of the HVDC Projects are Bipole type, first only one pole is built and run which is analyzed and after successful operation further paves a way for second pole or both the poles are built simultaneously Paper suggest dedicated metallic return instead of earth return. Modelling of equipments is done used in UHVDC transmission. UHVDC Transmission model with metallic return is built on matlab and studied. A fault on metallic return is simulated. Simulation results are studied and conclusion are made.