| 摘要 |
PROBLEM TO BE SOLVED: To enhance the degree of freedom of cooling temperature setting by a method wherein a mechanism by which the cooling temperature of an oxide current limiting element can be varied is provided. SOLUTION: An oxide superconducting current limiter system has a mechanism which controls a temperature by using a plurality of cooling media or cooling device to vary the current limiting characteristics. Liquefied argon is used as coolant and the temperature of the coolant is controlled by adjusting the temperature of the cooling unit of a refrigerator within a range of 86K-78K. As for the current limiting characteristics, Ic is about 450A at 86K and Ic is 1500A at 78K. Then, if the cooling temperature is 81K, Ic can be 1000A. By this system, a current limiter by which Ic can be set arbitrarily within a range of 450A-1500A can be manufactured. With this constitution, a current value at which a current limiting operation is started can be set arbitrarily. |
