AC 154kV Submarine Interconnection System between Hwawon and Anjwa Island in Korea

摘要

The Hwawon - Anjwa submarine cable system including the biggest submarine power cables in Republic of Korea, field repair joint and termination has been in commercial service on November 2010. It was a landmark project in Republic of Korea, also for LS cable and KEPCO(Korea Electric Power Corporation), through four years of concentrated system engineering and construction. AC 154kV XLPE insulated 3 core submarine power cable with a fiber optic cable integrated will relieve the increasing power demands according to the feasibly anticipating offshore wind farm grid near the Anjwa Island. With respect to installation of the biggest size and weight of cable in Korea ever, the planning and optimization of the loading and installation equipments has been performed. The south-west sea of Korea with strong side currents in excess of 3 knots and frequent storm force winds was a challenging itself. In spite of harsh marine environment, Global marine and LS Cable have adopted the new laying methodology of twin simultaneous installation and accomplished without interruptions during approximately 2 weeks of actual implementation period. Two cable lines of 7 km each have been laid simultaneously to minimize construction period and costs upon the request of KEPCO and the whole length was protected with specially designed polyurethane pipes throughout the cable laying process. Additional cable protection methodology such as rock berm or direct burial has been applied over the laid cables by half of 2011.