Patent ID: 7729731
Filing Date: 2010-06-01
Classification: H02G,Y02E

Abstract:
1. A terminal structure of a superconducting cable comprising, a terminal member of the superconducting cable extending from a cryogenic side to a room-temperature side through a bushing, wherein the terminal structure includes, in the cryogenic side, a refrigerant bath cooling said bushing, said refrigerant bath includes a gaseous refrigerant layer and a liquid refrigerant layer, and in said gaseous refrigerant layer, a distance between an inner surface of the refrigerant bath and an outer periphery of the bushing is dimensioned such that a gaseous state is maintained without being pressurized by a pressurizer and respective pressures of a gaseous refrigerant and a liquid refrigerant counterbalance each other; wherein the gaseous refrigerant remains in a volume between the inner surface of the refrigerant bath and the outer periphery of the bushing; wherein liquid Nitrogen is used as the liquid refrigerant and a pressure of the liquid refrigerant layer is maintained in the range of about 0.3 to about 0.5 MPa; wherein the distance between the inner surface of the refrigerant bath and the outer periphery of the bushing for the gaseous layer is in the range of about 0.1 to about 2.5 mm; and a longitudinal dimension of the volume occupied by the gaseous refrigerant layer is in the range of about 300 mm to about 500 mm.