| 摘要 |
PURPOSE:To enable to hold the voltage between coil terminals at an allowable insulating voltage or lower by using at least one protective means, which is connected in parallel or series with the superconductive coil and protects the superconductive coil, as an inverter power source. CONSTITUTION:A plurality of the inverter power sources 8 are mounted in a connecting manner such as parallel connection with the superconductive coil 1, and the power sources are connected through each switch 5. Each switch 5 connects the inverter power sources 8 and the superconductive coil 1 by means of a controller 7 in response to quenching signals at the same time as the normal conduction transfer of the superconductive coil 1 is detected by means of a quenching detector 6. The desired switch 5 is closed by means of the controller 7 in response to the quenching signals from the quenching detector 6 and the desired inverter power source 8 is connected when a superconductive condition of the superconductive coil 1 transfers to a normal conductive condition. Accordingly, the superconductive coil 1 can be protected because magnetic energy in the superconductive coil 1 is transferred to the outside through a plurality of the inverter power sources 8. |
