The high-temperature superconducting (HTS) cable demonstration project is now underway at Asahi substation in Yokohama city. This project aims to operate a 66 kV, 200 MVA HTS cable system in a real power network of the Tokyo Electric Power Company in order to verify its reliability and stable operation. A 240-meter-long HTS cable was successfully installed and other system components-such as a cable-to-cable joint, terminations and a cooling system-were also constructed at the substation. After several completion tests and performance tests of the system, the cable was connected to a real grid, and the ingrid demonstration began on October 29, 2012. So far, the cable system has been operating quite well despite the fluctuations of the transport current or the climate change.
