Application methodology of 22.9 kV HTS cable in metropolitan city of South Korea

With the increase of power demand and the progress of power industry deregulation, the transmission and distribution systems will have more complicated problems by the influence of curtailing investment and the NIMBY phenomena in overall power systems. [(Pierluigi, L and Andrea, M, 2002) and (Siberglitt, R, et al., 2002)] It is expected that the route length per MW demand of South Korea will decrease gradually from 0.6[C-km/MW] to 0.53[C-km/MW] in 2010. (KEPCO, 2002) This comes up to a real serious problem from system planning and operation viewpoints. HTS technologies related to power system have properties to solve these complex transmission and distribution constraints, especially for metropolitan area, in the future. As the HTS technology has developed, the HTS cable technology can be the most effective alternative to solve the future expected power network constraints. This paper describes the application methodology of developing 22.9 kV HTS cable by CAST for practical distribution system. 22.9 kV HTS cable under development with step-by-step application methodology can substitute the existing and planning conventional 154 kV cable. (YOON, 2002, 2003) If this scheme is applied, part of downtown 154 kV substation of metropolitan city such as Seoul can be changed into 22.9 kV switching station. Additionally, it can give huge economic, environmental benefits to all of the concerned authorities.