Oil type phase shift transformer for medium voltage inverter system

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.