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 which is configured to surround the outside of a core and to which three phase high voltage is applied;
• a plurality of second windings which are configured to surround the outside of the core and convert high voltage applied thereto from the first winding to low voltage;
• a tank providing an internal space in which the core, the first winding and the plurality of second windings are arranged and containing 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 high voltage;
• and
• a plurality of second bushings arranged on the top of the cover and connected to each of the plurality of second windings to output low voltage,
• wherein three outputs of the plurality of second bushings can be applied to the unit power cells.