| 摘要 |
PURPOSE:To prevent a quenching from occurring by flowing a constant current to a superconductor, periodically superposing a pulse current, predicting whether the quenching occurs or not, and performing a protective operation. CONSTITUTION:A constant-current power surce 1 supplies a current through a breaker 6 to a superconductor 3. The current value is variable, and can continuously control an arbitrary current from zero to a rated value. A pulse current is superposed on the superconductor by a pulse power source 2 in addition to the constant-current power source. A balance circuit 4 inserted in parallel with the superconductor forms a bridge circuit together with the superconductor, a voltage detector 5 operates even if a slight variation in the voltage occurs, and can output an alarm signal 8. The power source 1 reduces the current by the alarm signal, and even if the alarm signal still continues to flow, the breaker 6 is opened, and the energy of the superconductor is completely consumed by a protective resistor 7. |
