| 摘要 |
<p>According to an embodiment, the magnetizing inrush current suppression device is a magnetizing inrush current suppression device controlling a breaker for opening and closing the contacts between a triphasic transformer and a triphasic alternating current power source individually for the three phases, provided with a voltage measurement unit, a phase detection unit and a pole open/close instruction output unit. The voltage measurement unit takes one phase as a phase under focus and measures the voltage of the phase under focus. In case the breaker poles are to be opened, a shut-off first phase in an alternating current voltage and a shut-off second phase where a wave of the alternating current voltage reaches a high value, and, in case the breaker poles are to be closed, an injection first phase where a wave of the phase under focus reaches a high value and an injection second phase at a prescribed time-point after the injection first phase, are detected by the phase detection unit. In case the breaker poles are to be opened, the breaker pole is opened at the shut-off first phase for the two phases other than the phase under focus and the breaker pole is opened at the shut-off second phase for the phase under focus, and, in case the breaker poles are to be closed, the breaker pole is closed at the injection first phase for the phase under focus and the breaker pole is closed at the injection second phase for the two phases, caused by the pole open/close instruction output unit.</p> |
