| 摘要 |
PURPOSE:To provide an inverter facility in which the malfunction of a protective device caused by the current and voltage of a high-order zero-phase harmonic component is prevented. CONSTITUTION:In an inverter facility provided with a plurality of PWM inverter devices 31 which are supplied with electric power from a distribution transformer, have low-voltage buses on their primary side, and supply their secondary-side outputs to such a load as the induction motor 41, etc., through connecting cables, the inverter devices 31 are connected to each other by connecting their metal sheathes MS of each phase of their secondary-side connecting cables 11R, 11S, 11T through insulated cables 12R, 12S, and 12T and grounded through a grounding resistor 13. The grounding resistor 13 suppresses the traveling of zero-phase harmonic currents or voltages contained in the secondary-side outputs of the inverter devices 31 as the malfunctioning current or voltage of protective relays on the primary side. |
