In a joint project with New Energy and Industrial Technology Development Organization (NEDO), Sumitomo Electric will conduct Japan’s first demonstration experiment to transmit electricity to households with a superconducting cable coming November. The company will lay down a cable that becomes superconducting should it be cooled down to minus 196 degrees centigrade and transmit electricity of about 200,000 kW to see whether electricity to be lost as energy will decrease. In the future, the cable is expected to halve the loss in transmission.
The cable to be used is the high temperature superconducting cable covered by the tube in which liquid nitrogen circulates. The company will connect the cable with the power system connected with one of the electric power plants operated by Tokyo Electric Power Company this November for the one-year demonstration experiment. Tokyo Electric Power Company has underground cables with a total length of 400 km that transmit electricity at higher than 275 kilovolts, and about 40,000 kW of electricity is lost as energy in transmission. It is estimated that about 20,000 kW will be saved should the high temperature superconducting cables replace all the existing cables.
The high temperature superconducting cable from Sumitomo Electric