| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an excitation power source for a superconducting magnet which can be immediately recovered into its normal condition (the state of not being short-circuited) even after erroneously detecting an abnormal condition such as a quench, an internal abnormality, or an instantaneous drop of a general power source to short-circuit between output ends of the excitation power source. <P>SOLUTION: An excitation power source 101 comprises: a power source 1; a power unit 3; a protection circuit 16 which brings the power source into a protected condition by closing a contact point 4a for short-circuit between output ends of the power unit 3 in the case that the abnormality of a superconducting magnet 2 is detected erroneously; and a first shunt resistance 5 for detecting a current value in a loop A. The excitation power source 101 further comprises a recovery circuit 31. In the case where the protection circuit 16 has activated a protection relay 4 to close the contact point 4a, the recovery circuit 31 brings the value of an output current of the power unit 3, and the value of current flowing through a superconducting coil 2L into agreement with each other by use of detection values at the first shunt resistance 5 and a second shunt resistance 8, and then opens the contact point 4a to recover the power source from the protected condition. <P>COPYRIGHT: (C)2013,JPO&INPIT |
