Converter device

Patent metadata

Field	Value
Publication number	US-9742306-B2
Application number	US-201515301625-A
Country	US
Kind code	B2
Filing date	Feb 25, 2015
Priority date	Feb 25, 2015
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

A converter device includes: a converter circuit unit converting alternating-current voltages from a Δ connection and a Y connection of a twelve-phase rectification transformer, into a direct-current voltage; a current detection unit detecting a current of a direct-current bus connected to the converter circuit unit; an open-phase detection unit connected to a side of the Δ or Y connection to detect whether open phase is caused in the connection connected thereto; and an output unit outputting, when detected that there is open phase caused in the Δ or Y connection based on a detection signal of the open-phase detection unit and a current value of the direct-current bus detected by the current detection unit, an indication that open phase is caused in the Δ or Y connection. When open phase is caused, it is possible to output an indication of whether the open phase is caused on the Δ or Y connection side.

First claim

The invention claimed is:

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.

2. The converter device according to claim 1 , wherein
based on the detection signal obtained by the detection of the open-phase detection unit and the current value of the direct-current bus detected by the current detection unit, the determination unit determines that there is no open phase caused in the Δ connection and the Y connection, and
when the determination unit has determined that there is no open phase caused in the Δ connection and the Y connection, the output unit outputs an indication that there is no open phase caused in the Δ connection and the Y connection.

3. The converter device according to claim 1 , wherein when a period of the current value of the direct-current bus detected by the current detection unit is not twelvefold a power-supply frequency, the determination unit determines that there is open phase caused in the Δ connection or the Y connection based on the detection signal obtained by the detection of the open-phase detection unit.

Assignees

• Mitsubishi Electric Corp

Inventors

• Otsubo Masahiro

Classifications

• H02M2001/0009

  Electricity · mapped topic

• H02M7/02

  Conversion of AC power input into DC power output without possibility of reversal · CPC title

• H02M7/003 Primary

  Constructional details, e.g. physical layout, assembly, wiring or busbar connections · CPC title

• H02M7/04

  by static converters · CPC title

• H02M1/32 Primary

  Means for protecting converters other than automatic disconnection · CPC title