| 摘要 |
PROBLEM TO BE SOLVED: To enabled compensation with higher accuracy of deviation by continuously varying the resonance frequency, without enlarging facility scale, moreover without being affected by the vibration of reactor due to the electromagnetic effect effectively using the internal space of capacitor case, in an AC filter of the serial resonance circuit structure of the self-tuning system for power. SOLUTION: A main capacitor 10 is accommodated within a capacitor case 13 that is filled with insulation oil 5, one end of this capacitor 10 is connected to an AC power line 4, while the other end is grounded via a reactor 2, a series resonance circuit 11 for filter is formed of the main capacitor 10 and reactor 2 and a fixed electrode 15 of variable capacitor 12 of the parallel flat plate structure to compensate for deviation in the resonance frequency of the series resonance circuit 11 is provided in the ground insulating region at the external side of the main capacitor 10 within the case 13, and a grounded variable electrode 16 of the variable capacitor 12, in which the opposing distance to electrode 15 changes due to the compensation, is provided between this electrode 15 and the internal wall surface of the case 13. |
