| 摘要 |
PURPOSE: To judge the state of an isolated operation of an induction generator when a self-excitation frequency or the phase of the induction generator is changed by a method wherein a reactor or a capacitor is inserted intermittently in parallel with the induction generator which is linked to a power system. CONSTITUTION: A reactor 2 is connected intermittently, via a switching device 1 in parallel with an induction generator 11, to a prescribed system 13 on the side of the induction generator 11 from a cutoff device 10. In addition, a frequency detector 5 is connected, via a potential transformer 3, to the prescribed system 13, and the output of the detector 5 is sent out to a display operating device 6 via a computing unit 4. In addition, the computing unit 4 is connected to the switching device 1 and to the cutoff device 10, and the computing unit 4 and the display operating device 6 are connected to an uninterruptible power supply 7. Thereby, when the self-excitation frequency or the phase of the induction generator 11 is changed, the state of the single operation of the induction generator 11 can be judged, and it is possible to prevent the single operation of the induction generator 11. |
