Question

A 2.2 KVA, 440---220 V, 60 Hz, step-down transformer has the following parameters: Rp= 3.0 Ω, Xp= 4.0 Ω, Rs= 2.5 Ω, Xs= 2.0 Ω, Rc= 60 KΩ, and Xm = 15 KΩ. The transformer is operating at full load with a power factor of 0.707 lagging. The magnetizing branch impedance can be ignored.

a) Draw the transformer’s equivalent T-circuit,

b) Find the equivalent winding impedance referred to the high side,

c) Calculate the primary and secondary currents,

d) Determine the P in and P out of the transformer.

e) Determine the efficiency and the voltage regulation of the transformer at the full load.

Answer 1