| 摘要 |
PURPOSE:To suppress the increase in induced current in a normal superconducting wirings and to prevent the occurrence of normal conduction transition, by making the resistance value of a protective resistor, which is connected to another magnetically coupled normal superconducting winding, higher than an ordinary value, when the normal conduction transition occurs in the seperconducting winding. CONSTITUTION:Two superconducting windings C1 and C2 are magnetically coupled through mutual inductance M. An ordinary protective resistor R1 and an auxiliary protective resistor R1' are connected in series across both ends of the first superconducting winding C1. A contactor B1' is connected to the R1' in parallel. The B1' is interlocked with a breaker B1. When normal conduction transition is detected in the first superconducting winding C1, the B1 is turned OFF and the B1' is turned ON. Therefore, a state, in which only the R1 is connected to the C1, is obtained. At this time, a voltage is induced in the second superconducting winding C2 through the mutual inductance M and current is increased. Since R2' is connected to R2 as a protective resistor for the C2 in series, the increase in current is suppressed in comparison with the case, in which only the R2 is used. Thus the occurrence of the normal conduction transition in the C2 can be prevented. |
