METHOD AND APPARATUS FOR REGULATING CURRENT-LIMITING OPERATION STARTING CURRENT VALUE OF SUPERCONDUCTING CURRENT LIMITER

摘要

PPROBLEM TO BE SOLVED: To regulate variations of starting current value in a current-limiting operation, that occurs as individual difference in a manufactured SN-transition type superconducting current limiter so that they lie within a range from a non-actuation duty required from a system to actuation duty. PSOLUTION: In an SN-transition type superconducting current limiter which houses a superconducting current-limiting element 1 inside a low-temperature container 3 and holds the element in a superconducting state, a freezer 4 is provided in the low-temperature container 3, and while defining as a current-limiting operation starting current value a current value when the resistance is generated, at a fixed ratio with respect to resistance of the SN-transition type superconducting current limiter, just above the critical temperature and defining as a reference a previously measured current-limiting operation starting current value of the current limiter; the temperature of a cooling fluid 9 inside the low-temperature container 3 is controlled by the freezer 4 so as that it makes the current-limiting operation initiation current value lie within a range of actuation duty and non-actuation duty, at a point where the current limiter is introduced. PCOPYRIGHT: (C)2010,JPO&INPIT