Giga Watt class hybrid energy transfer line of hydrogen and electricity

Applicability of 1 GW class hybrid energy transfer line (HETL) of hydrogen and electricity is investigated in this report. The rated current is 10 kA, and operation voltage is 100 kV (+ 50 kV and -50 kV for ground). Delivery capacity of the liquid hydrogen is 100 tons per day. Re-cooling station of the liquid hydrogen is placed on every 10 km of the unit section. High Jc performance under high temperature region around 20 K requires for the SC wire. The special multi-filamentary magnesium diboride (MgB2) wire was developed to suppress the Ic degradation against bending strain. Structure of a coaxial stranded cable is proposed for the design of 10 kA MgB2 cable. Pressure of liquid hydrogen from 0.4 to 0.6 MPa was chosen, in order to keep the liquid phase up to 25 K. It was confirmed that this HETL is one of the attractive energy transportation system which combines hydrogen fuel and SC power transmission. (author)