High TC superconducting cable conductor employing oxide superconductor.

摘要

Provided is an insulated oxide superconducting cable conductor having a high critical current and a high critical current density. The insulated oxide superconducting cable conductor comprises an elongated former (11), a plurality of tape-shaped multifilamentary oxide superconducting wires (12) which are wound on the former (11) at a bending strain factor of not more than 0.5 %, and a spirally wound tape-shaped insulating material (13) covering the tape-shaped multifilamentary oxide superconducting wires-(12). The tape-shaped multifilamentary superconducting wires (12) are superposed on the former in layers, whereby stabilizing materials of the superposed superconducting wires (12) are in contact with each other. The tape-shaped insulating material (13) consists essentially of a material which is contracted at a thermal contraction rate of at least three times that of the tape-shaped multifilamentary wires (12) by cooling from a temperature of 298 K to that of 77 K. The tape-shaped insulating material (13) can apply a pressure to the superposed multifilamentary superconducting wires (12) toward the former (11) while improving electrical contact between the superposed multifilamentary superconducting wires (12) by cooling in employment. The former (11) can be formed of a flexible tube.