| 摘要 |
PROBLEM TO BE SOLVED: To increase an operation efficiency of the entire system and obtain a high reliability of the system. SOLUTION: This coil system is provided with a superconducting coil 1, a current-type self-exciting converter 2 which converts AC power to DC power and magnetizes and demagnetizes the superconducting coil 1, a DC reactor connected to a DC-side output terminal of the self-exciting converter 2, a superconducting coil shorting circuit which is parallelly connected to the superconducting coil 1 and has a switch 8 for power-on, a converter shorting circuit 12 which is parallelly connected to the DC-side of the self-exciting converter 1 and has a switch 11 for power-on, and a DC cut-off switch 10 which is provided in a DC main circuit constituted of the superconducting coil 1 and the self-exciting converter 2. As for the DC reactor 5, such a DC reactor as to make a reactive power-controlled operation of the self-exciting converter 2 with the converter shorting circuit 12 used as a load is used.
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