Super-conductive cable
AssigneeSumitomo Electric Industries, Ltd.
InventorsHiroyasu Yumura, Masanobu Nishimura
Life of this patent
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Abstract
A superconducting cable according to the present invention includes a former, a superconducting conductor layer formed around the outer circumference of the former, an electric insulating layer formed around the outer circumference of the conductor layer, a shield layer formed around the outer circumferential of the insulating layer, and a normal-conducting metal layer formed between the insulating layer and the shield layer. The normal-conducting metal layer existing inside shield layer has an inductance greater than that of the shield layer, which can suppress a rise in temperature in the event of accidents such as short-circuits, and also can reduce AC losses since currents flow through shield layer during the passage of normal currents.
Claims9
A superconducting cable comprising:
- a former made of a normal-conducting metal;
- a first superconducting layer formed around the outer circumference of said former and in electrical communication with the former;
- an electric insulating layer formed around the outer circumference of said first superconducting layer;
- a second superconducting layer formed around the outer circumference of said electric insulating layer;
- and
- a normal-conducting metal layer is formed between said electric insulating layer and said second superconducting layer;
- any volume between the first superconducting layer and said electrical insulating layer is free of the normal conducting metal layer;
- and any volume between the second superconducting layer and an outer layer is free of the normal conducting metal layer;
- and
- wherein said first and second superconducting layers are in a state cooled by a refrigerant.
A superconducting cable comprising:
- a former made of a normal-conducting metal;
- a first superconducting layer formed around the outer circumference of said former and in electrical communication with the former;
- an electric insulating layer formed around the outer circumference of said first superconducting layer;
- a second superconducting layer formed around the outer circumference of said electric insulating layer;
- no more than one normal-conducting metal layer is formed between said electric insulating layer and in contact with said second superconducting layer;
- and
- wherein said first and second superconducting layers are in a state cooled by a refrigerant.
Dependencies are inferred from the claim text.