Oil type phase shift transformer for medium voltage inverter system

Patent metadata

Field	Value
Publication number	US-10069437-B2
Application number	US-201615388357-A
Country	US
Kind code	B2
Filing date	Dec 22, 2016
Priority date	Apr 5, 2016
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

Disclosed is a phase shift transformer for supplying voltage to a plurality of unit power cells in a medium voltage inverter system. The phase shift transformer according to the present invention comprises a first bushing arranged by the side of a tank and connected to a first winding to apply high voltage and a plurality of second bushings arranged on the top of a cover and connected to each of a plurality of second windings to output low voltage, wherein three outputs of the plurality of second bushings can be applied to unit power cells.

First claim

What is claimed is:

1. A phase shift transformer for supplying voltage to a plurality of unit power cells in a medium voltage inverter system, comprising:
a first winding configured to surround an outside of a core and to which a three-phase high voltage is applied;
a plurality of second windings configured to surround the outside of the core and to convert the three-phase high voltage applied thereto from the first winding to a low voltage;
a tank providing an internal space in which the core, the first winding, and the plurality of second windings are arranged, and the tank containing an insulating oil therein;
a cover provided on the top of the tank to provide a sealed internal space along with the tank;
a first bushing arranged by the side of the tank and connected to the first winding to apply the three-phase high voltage;
a plurality of second bushings arranged on the top of the cover and connected to each of the plurality of second windings to output the low voltage,
radiators arranged on front and back surfaces of the tank to cool the insulating oil or the first winding and the second windings;
an oil conservator disposed on the top of the tank and connected to the tank; and
a housing in which the plurality of second bushings are arranged, wherein a cover thereof is capable of being opened and closed,
wherein the plurality of second bushings supply the three-phase high voltage to the plurality of unit power cells, and
wherein three outputs of the plurality of second bushings are connected to the unit power cells.

2. The phase shift transformer of claim 1 , further comprising a tap changer arranged on the top of the cover to control voltage variation during operation of the phase shift transformer.

Assignees

• Lsis Co Ltd

Inventors

• Kim Tae-Bum

Classifications

• H01F27/04 Primary

  Leading of conductors or axles through casings, e.g. for tap-changing arrangements · CPC title

• H01F27/02

  Casings · CPC title

• H01F27/2876

  Cooling (cooling transformers and inductances in general H01F27/08) · CPC title

• H01F29/02

  with tappings on coil or winding; with provision for rearrangement or interconnection of windings · CPC title

• H02M7/44 Primary

  by static converters · CPC title