The circuit shown is a model of a transformer with an applied source Eg and a resistive load R. Re and Le are the effective copper losses from both primary and secondary. Ro and Lo are the core losses. The transformer is rated as 48000/1200V 60kVA. Re = Xe = 200Ω, Ro = 2MΩ, and Xo = 1MΩ.
The full load condition is the case when the load current and voltage are the rated secondary values. Determine the efficiency and voltage regulation.