Patent ID: 9742306
Date: 2017-08-22
CPC Classifications: G01R,H02M

Claim:
1. A converter device comprising: a converter circuit unit that converts alternating-current voltages supplied from two systems, which are a Δ connection and a Y connection of a twelve-phase rectification transformer, into a direct-current voltage; a current detection unit that detects a current of a direct-current bus connected to the converter circuit unit; an open-phase detection unit that is connected to a side of the Δ connection or a side of the Y connection and detects whether there is open phase caused in the connection connected to the open-phase detection unit; a determination unit that, when it is detected that there is open phase caused in the Δ connection or that there is open phase caused in the Y connection based on a detection signal obtained by the detection of the open-phase detection unit and a current value of the direct-current bus detected by the current detection unit, determines that there is open phase caused in the Δ connection or the Y connection; and an output unit that outputs an indication that there is open phase caused in the Δ connection or the Y connection based on a result of determination made by the determination unit.