Wattmeter reading x C.T. ratio

Wattmeter reading x P.T. ratio

Wattmeter reading x C.T. ratio x P.T. ratio

(Wattmeter reading/C.T. ratio) x P.T. ratio

primary winding

secondary winding

low voltage winding

high voltage winding

110 V

220 V

330 V

440 V

1100 V, 50 A

11 kV, 50 A

11 kV, 500 A

110 kV, 500 A

to provide cooling air to the winding

to arrest the flow of moisture into the tank

to control the level of oil in the tank

to filter the transformer oil