Superconducting shielded core reactor with reduced AC losses

Apparatus for limiting fault current under fault conditions in a circuit and for reducing AC losses in a superconducting shielded core reaction (SSCR) in said circuit under continuous normal operating conditions, said apparatus comprising:

• series connected first and second conductive coils electrically coupled to the circuit and carrying a first AC current, wherein said first and second coils respectively generate first and second magnetic fluxes;
• a ferromagnetic core magnetically coupled to first and second conductive coils and responsive to said first and second magnetic fluxes;
• and
• a superconducting arrangement in said SSCR magnetically coupled to said ferromagnetic core and said first and second conductive coils and carrying a second AC current induced by said first AC current, wherein said second AC current produces a third magnetic flux, wherein said third magnetic flux cancels out said first and second magnetic fluxes under continuous normal operating conditions for reducing AC losses, and wherein said first and second magnetic fluxes exceed said third flux under fault conditions and said ferromagnetic core introduces a large impedance in said first and second coils for limiting a fault current in the circuit, and wherein said first and second magnetic fluxes are respectively applied to the inside and outside of said superconducting arrangement.