Power transformers are used to transfer large amounts of electrical energy between circuits at different voltage levels in power systems. They step up generator output to transmission voltages, interconnect transmission networks, and step down voltage at substations for distribution and industrial loads. They provide galvanic isolation between sections of the grid, help manage losses by enabling high voltage transmission, and support voltage regulation via tap changers. In industrial plants, power transformers feed major motors, drives and process systems, forming the backbone of electrical supply infrastructure.