Superconducting cable

A superconducting cable comprising:

• a former;
• at least one-layer superconducting conductor layer including a plurality of superconducting wires arranged in parallel at an outer side of the former and in a lengthwise direction of the former;
• and
• at least one-layer superconducting shield layer including a plurality of superconducting wires arranged in parallel at an outer side of the superconducting conductor layer and in the lengthwise direction of the former,
• wherein the superconducting wires of the superconducting conductor layer and the superconducting shield layer comprise:
• a metal substrate layer;
• a plurality of deposition layers deposited on the metal substrate layer, the deposition layers including a superconducting layer;
• and
• a silver (Ag) layer provided at an outer side of the deposition layers and formed of a silver material,
• wherein a conducting layer formed of a metal having a current-carrying property at room temperature is added to opposite outer surfaces of the metal substrate layer and the silver (Ag) layer of the superconducting wires, the conducting layer used as a return conductor of fault current when the fault current is generated, together with the former, and
• wherein a minimum cross-sectional area of the former satisfying a minimum short-circuit condition which is a minimum current-carrying rate condition required for a predetermined time during occurrence of an electrical short-circuit accident is smaller when a metal conducting layer having a predetermined thickness is provided at both the outer sides of the metal substrate layer and the silver (Ag) layer of the superconducting wires than when the metal conducting layer is not included in the superconducting wire.

A superconducting cable comprising:

• a plurality of conductor wires compressed into a round shape or a cylindrical pipe shape;
• a plurality of superconducting wires arranged at outer sides of the conductor wires to form an at least one-layer superconducting conductor layer;
• insulating paper configured to form an insulating layer by winding outer sides of the superconducting wires forming the superconducting conductor layer a plurality of times;
• a former;
• and
• a plurality of superconducting wires arranged at an outer side of the insulating paper to form an at least one-layer superconducting shield layer,
• wherein a thin metal layer is added to opposite surfaces of each of the superconducting wires of the superconducting conductor layer and the superconducting shield layer,
• wherein the former has a cross-sectional area which is smaller than that of a former of a superconducting cable in which the thin metal layer is not added to superconducting wires and the superconducting shield layer and which is designed on an assumption that all fault current flows to the former.