PURPOSE: To improve safety and reliability by cooling a superconductor with gas thereby preventing explosive evaporation of liquid refrigerant upon quenching.
CONSTITUTION: Gas 8 is cooled below the critical temperature of a superconductor 1 through a cooler 4 and cools the superconductor 1. A container 5 is provided with a safety valve 6 in order to cope with pressure rise. The container 5 is provided with a vacuum layer 7 at the outside thereof. The superconductor 1 converts to a resistor, upon quenching, to produce heat but when a circuit breaker functions, it is cooled with the cooling gas 8 and converted into a superconductor. Since liquid refrigerant is not employed, accident due to explosive evaporation of liquid refrigerant can be prevented even when the circuit breaker does not function.
MIZOGUCHI HITOSHI
IKEDA HISATOSHI
YAGIU SATORU
