Superconducting cable

Abstract

Provided is a superconducting cable capable of maintaining a predetermined thermal insulation property without having a vacuum thermal insulation structure. The superconducting cable of the present invention comprises: a cable unit 100 , in which a core having a superconductor layer and an electrical insulation layer is housed in a core-housing pipe; a thermal insulation member 200 which is provided outside the cable unit and maintained in a non-vacuum state; and a sealing member for preventing the permeation of moisture into the thermal insulation member. By equipping the outside of the cable unit with the thermal insulation member 200 which is maintained in a non-vacuum state, it is made possible to maintain the predetermined thermal insulation property without having a vacuum thermal insulation structure.

1 . A superconducting cable comprising a cable unit, a thermal insulation member, and a sealing member,
 the cable unit being composed of a core-housing pipe accommodating a core having a superconductor layer and an electrical insulation layer,   the thermal insulation member being provided outside the cable unit and maintained in a non-vacuum state,   the sealing member preventing the permeation of moisture into the thermal insulation member.   
   
   
       2 . A superconducting cable as set forth in  claim 1 , wherein the core-housing pipe is not equipped with a thermal insulation layer. 
   
   
       3 . A superconducting cable as set forth in  claim 1 , wherein the thermal insulation member is composed of at least either one of a multi-layer thermal insulation and a filling thermal insulation. 
   
   
       4 . A superconducting cable as set forth in  claim 3 , wherein the inner circumferential part of the thermal insulation member is a multi-layer thermal insulation and the outer peripheral part of the thermal insulation member is a filling thermal insulation. 
   
   
       5 . A superconducting cable as set forth in any of  claims 1 , wherein a plurality of cable units are arranged at positions close to each other. 
   
   
       6 . A superconducting cable as set forth in  claim 5 , wherein an interval existing between the respective cable units is equal to or less than the outer diameter of the cable unit. 
   
   
       7 . A superconducting cable as set forth in any of  claims 1 , wherein a coolant transport tube is provided near a cable unit, and wherein the cable unit and the coolant transport tube are covered with a common thermal insulation member. 
   
   
       8 . A superconducting cable as set forth in  claim 7 , wherein the interval existing between a cable unit and a coolant transport tube is equal to or less than the outer diameter of the cable unit. 
   
   
       9 . A superconducting cable as set forth in  claim 7 , wherein an auxiliary thermal insulation structure is provided at least at either one of the cable unit and the coolant transport tube. 
   
   
       10 . A superconducting cable as set forth in  claim 7 , wherein at least either one of a cable unit and a coolant transport tube is housed in a duct, a thermal insulation member being arranged on the outer side of the duct. 
   
   
       11 . A superconducting cable as set forth in  claim 10 , wherein a gap between the duct and at least either one of the cable unit and the coolant transport tube is airtightly sealed. 
   
   
       12 . A superconducting cable as set forth in  claim 11 , wherein the inside of the duct is evacuated. 
   
   
       13 . A superconducting cable as set forth in any of  claims 1 , wherein the thermal insulation member is made of aerojel.