Patent ID: 7586717

Claim:
An electrical device for current conditioning comprising a primary spool, a secondary spool which comprises a quenchable superconductor exhibiting a transition from a low resistive state to a high resistive state when a critical value of the electric current is exceeded, the secondary spool being coupled through a common part of magnetic flux with the primary spool, the secondary spool further comprising a metallic member which form a closed loop circuit, and a cryostat providing a cooling of the secondary spool, wherein: the secondary spool comprises at least one element based on a substantial fraction of a non-quenchable conductor that exhibits a minor dependence of its resistance on current and magnetic field, and a fraction of the quenchable superconductor; and at least one turn of the non-quenchable conductor and the quenchable superconductor is electrically jointed in series providing a closed loop circuit.