Patent ID: 6936772
Filing Date: 2005-08-30
Classification: H01B,Y02E,Y10S,Y10T

Abstract:
1. A cable employing an oxide superconductor, comprising: a flexible core member; a plurality of tape shaped oxide superconducting wires being laid on said core member with tension of not more than 2 kgf/mm said plurality of tape-shaped superconducting wires forming a plurality of at least two distinct groups of tape-shaped wire layers each being formed by laying a plurality of said tape-shaped superconducting wires in a side-by-side manner, wherein a layer of dielectric material separates each of the at least two distinct groups of tape-shape wire layers and the dielectric material is biaxially oriented at a ratio from about 5:1 to about 10:1 in the machine direction, said plurality of layers being successively stacked on said core member without an insulating layer between said plurality of layers and said core member, said core member providing said superconducting cable with flexibility, said superconducting cable capable of maintaining a superconducting state at the temperature of liquid nitrogen, said wires having substantially homogeneous superconducting phases along the longitudinal direction of said wire, the c-axes of said superconducting phases being oriented substantially in parallel with the direction of thickness of said wire, said superconducting wires being formed by grains aligned in parallel extending along the longitudinal direction of said wire, said grains being stacked along the direction of thickness of said wire wherein said core member is a pipe having a mat shaped surface on its exterior which forms a surface for the tape-shaped superconducting wires.