Heat load to the cryogenic system in the 1000 m class superconducting DC power transmission system

Long-term circulation and load cycle tests of the cooling of the 1000 m class superconducting DC power transmission system in Ishikari, Japan were performed to measure the heat load delivered to and the power consumption of the cryogenic system. The average heat load and power consumption during these tests was about 2.5 and 120 kW, respectively. To increase the efficiency of superconducting power transmission systems, the selection and composition of constituent devices of the cooling system should be optimized.