Cooling control apparatus for superconducting fault current limiter

A cooling control device for a superconducting fault current limiter, the cooling control device comprising:

• a superconducting fault current limiter comprising:
• a first container configured to accommodate a subcooled liquid coolant and a first gas with first pressure, the subcooled liquid coolant immersing a superconducting element;
• a second container configured to accommodate a saturated liquid coolant and a second gas with second pressure, wherein heat exchange between the subcooled liquid coolant and the saturated liquid coolant occurs at an interface between the first container and the second container;
• a freezer configured to condense the second gas, which is vaporized from the saturated liquid coolant;
• an inner wall of the second container being at least a portion of an outer wall of the first container to exchange heat through the interface;
• a pressure sensor for detecting a pressure of the second gas;
• and
• a control unit configured to estimate a temperature of the saturated liquid coolant and control a temperature of the freezer based on the estimated temperature, wherein the control unit estimates the temperature by applying the detected pressure to a temperature-pressure correlation in a saturation diagram of the saturated liquid coolant.