System having a superconductive cable

A superconductive cable comprising:

• a superconductive conductor,
• a dielectric enclosing said superconductive conductor;
• and
• a superconductive screen arranged over said dielectric, acting as a spacer,
• an intermediate metal tube, which is closed all around over its entire length, arranged over the screen;
• and
• a cryostat, which has a metal inner tube a metal outer tube and superinsulation arranged between them, encloses said intermediate metal tube, with a gap between said metal inner tube of said cryostat and said intermediate metal tube, said gap for conveying a cooling medium;
• wherein an impregnating medium, which is fluid at room temperature, and to which a constant pressure is applied, is introduced as an impregnating medium for said dielectric into a space between said superconductive conductor and said intermediate tube, and
• wherein at least one refrigeration unit, for supplying said cooling medium, is connected to said gap between said cryostat and said intermediate metal tube.