Three single-phase transformers are used in a Y-Y configuration
to supply a load rated 4000 V, and drawing 80 kW at a power factor
of 0.72 (lagging), independently of the voltage. Each transformer,
rated 14500/2300 V, 40 kVA, has the following parameters in pu:
series elements: 0.01 (resistive), 0.06 (inductive); magnetizing
branch: 70 (resistive), 20 (inductive).
(a) Assume the transformer is ideal and the phase voltage at the
primary is 13000 V. Draw the per phase equivalent circuit of the...