Patent ID: 6049036
Filing Date: 2000-04-11
Classification: H01F,H01R,H02G,Y02E,Y10S

Abstract:
A thermally insulated terminal for connection between a multiphase cable and electrical equipment at room temperature, said cable comprising, for each phase, at least one coaxial unit having a phase superconductor, an interposed electric insulating layer and a coaxial neutral superconductor, and in addition, thermal-control means for keeping said superconductors of each of said coaxial units in a superconductive state, said terminal comprising:at least one casing;cooling means for cooling the interior of said casing to a temperature lower than the critical temperature at which superconductivity occurs;a live current lead for each phase superconductor, having a related phase connector for connection to said room temperature equipment, wherein each said current lead is provided with a resistive conductor for connection intermediate a phase superconductor and said connector of the current lead to provide connecting areas between said resistive conductors and phase superconductors, said connecting areas being disposed within the casing;a single neutral current lead provided with a single neutral resistive conductor, an end of said neutral current lead being connected to a neutral connector for connection to the room temperature equipment;connection means made of superconducting material for connection between each neutral superconductor and said single neutral resistive conductor to provide a junction area between said connection means of superconducting material and said single neutral resistive conductor, said junction area and at least said connection means being internal of the casing;said casing including a vacuum portion containing at least said single neutral conductor; andthermal control means formed of a plurality of mutually independent circuits having respective cooling fluids, each of said circuits consisting of a double-walled cylinder inside which said fluids circulate, said cylinders being disposed mutually offset in a coaxial relation at least about said single neutral conductor, said superconducting connection means and said junction area for connection to the neutral resistive conductor being maintained under their critical temperature by the presence, in a portion of the casing, of a channel into which cooling fluid circulates.