Long Term Performance Test of KEPCO HTS Power Cable

A project for verification of HTS power cable system by KEPCO (Korea Electric Power Corporation) was started in 2002. The HTS power cable system of 100 m, 22.9 kV, 1.25 kA has been installed and tested at the KEPCO´s Gochang power testing center in Korea since 2006. A liquid nitrogen decompression cooling system with a cooling capacity of 3 kW at 66 K and a closed-circulation system of subcooled liquid nitrogen were employed for this purpose. Several performance tests for the HTS power cable system, such as cooling capacity, electrical loading, heat load, AC loss and temperature stability, were performed at operating temperature of 66.4 K. Thermal cycle test including cool-down to liquid nitrogen temperature and warming up to room temperature, was also performed to investigate thermal cycle influences for 8 times. The reliability through the several demonstration tests over than 8,000 hours was proved.