Patent ID: 7908124

Claim:
A method of computation for designing a DC superconducting cable comprising a conductor layer, an outer-conductor layer arranged outside the conductor layer through an electrical insulation layer, and an inner stress-relaxation layer inside the conductor layer, the method being capable of calculating a winding diameter and a winding pitch of superconducting wires to constitute the conductor layer and the outer-conductor layer, the method of computation comprising: a: calculating the relationship between a ratio Xf and a contraction amount Cf, the ratio Xf being a ratio between the winding diameter and the winding pitch of a superconducting wire constituting the conductor layer, and the contraction amount Cf being capable of absorbing the thermal contraction of the superconducting wire due to cooling; b: calculating the relationship between the ratio Xf and a use quantity ratio Ufx of the superconducting wire in the conductor layer per unit length of the cable; and c: extracting, from the calculation results of a and b, data of the winding diameter and the winding pitch of the superconducting wire, the data enabling satisfying a given contraction amount Cfs and the use quantity ratio Ufxs of the superconducting wire.