| 摘要 |
PURPOSE:To effectively interrupt only an abnormal inverter device by disconnecting the inverter device controlled by the control voltage when the rate of change of the control voltage becomes the prescribed level or higher from a parallel operation system. CONSTITUTION:Control voltages 19-1, 119-1 as output signals of voltage controlling error amplifiers 1, 119 are respectively inputted to differentiators 20, 120, the outputs of which are respectively inputted to level detectors 31, 131, which compare them with the prescribed level. When error amplifiers 19 or 119 becomes defective, an interrupter 15 or 115 is interrupted by the outputs from the detectors 31, 131. |
