Current limiting choke coil

A device comprising:

• a single winding;
• and
• a core arranged in said single winding, said core formed from a metal oxide ceramic superconductive component, wherein if the amplitude of an alternating current applied to said single winding exceeds a threshold value at a system frequency, said single winding generates a threshold magnetic field which converts said superconductive component into a non-superconductive component.

A device for changing an inductance of a choke comprising;

• a single winding;
• and
• a core arranged in the single winding for producing a first choke inductance when an alternating current applied to the single winding is less than a threshold at a predetermined frequency, and for producing a second choke inductance when the amplitude of an alternating current exceeds the threshold, the core formed from a metal oxide ceramic superconductor material so that a magnetic field produced by the current converts the superconductive material into a normally conductive material when the amplitude of the current exceeds the threshold.

A device comprising;

• a winding;
• and
• a coil core arranged in the winding, the coil core being hollow and comprising alternatingly arranged superconductive components of metal oxide ceramic superconductive material and ferromagnetic components of ferromagnetic material, at temperatures below the critical temperature of the superconductive elements, the susceptibility of the ferromagnetic elements being typical of the susceptibility of ferromagnetic substances at room temperatures, wherein if the amplitude of an alternating current applied to the winding exceeds a threshold value at a system frequency, the winding generates a threshold magnetic field which converts the superconductive components into non-superconductive components.

A device comprising:

• a winding;
• and
• a coil core arranged in the winding, the coil core being hollow and comprising alternatingly arranged superconductive components of metal oxide ceramic superconductive material and ferromagnetic components of ferromagnetic material, the ferromagnetic elements being thermally insulated form the superconductive elements and held at a higher temperature than the temperature of the superconductive elements, at temperatures below the critical temperature of the superconductive elements, the susceptibility of the ferromagnetic elements being typical of the susceptibility of ferromagnetic substances at room temperatures, and wherein if the amplitude of an alternating current applied to the winding exceeds a threshold value at a system frequency, the winding generates a threshold magnetic field which converts the superconductive components into non-superconductive components.