Superconducting current limiting apparatus

A non-inductive superconducting current limiting apparatus comprising:

• a first container having opposing wall structure;
• a superconducting current limiting element accommodated in said first container;
• a refrigerant filling said first container for cooling said superconducting current limiting element;
• a second container for accommodating said first container with a gap in such a manner that said first container is heat insulted;
• a conductor means for connecting said superconducting current limiting element to an external power supply system;
• and
• means for circulating the refrigerant in said first container, said circulating means comprising inlet and outlet ports formed in the opposing walls of the first container;
• said superconductive current limiting element comprising a first insulating tube means around which a first superconducting current limiting wire is wound, and around which a second superconducting current limiting wire is wound, said second current limiting wire being wound in such a manner that a magnetic flux generated by a current that flows in said first current limiting wire is canceled by a magnetic flux generated by a current that flows in said second current limiting wire, said first and second insulating tubes being arranged so that the space formed therebetween accords with a circulation direction of the refrigerant from the inlet port towards the outlet port.