Patent ID: 6417458
Filing Date: 2002-07-09
Classification: H01B,Y02E,Y10T

Abstract:
A superconducting cable for alternating current, comprising conductor layers formed by a plurality of tape-shaped superconducting wires wound around a center member, an electric insulating layer formed outside the conductor layers, and a plurality of shielding layers formed outside the insulating layers, wherein(a) the conductor layers are formed, where N is a number of layers in the conductor layers and expressed by an integer, by gradually increasing a winding pitch of conductor layers in the same direction from an inner first layer to an N/2 layer when the number of layers is even, or from an inner first layer to a (Nâˆ’1)/2 layer when the number of layers is odd, and then by gradually decreasing a winding pitch of conductor layers in an opposite direction to the inner layers from a N/2+1 layer to an N layer when the number of layers is even, or from a (N+1)/2 layer to an N layer when the number of layers is odd; and (b) the shielding layers are formed, where n is the number of layers in the shielding layers and expressed by an integer, by gradually increasing a winding pitch of shielding layers in the same direction from an inner first layer to an n/2 layer when the number of layers is even, or from an inner first layer to a (nâˆ’1)/2 layer when the number of layers is odd, and then by gradually decreasing the winding pitch of shielding layers in an opposite direction to the inner layers from a n/2+1 layer to an n layer when the number of layers is even, or from a (n+1)/2 layer to an n layer when the number of layers is odd.