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2. Three identical single-phase transformers are connected to form a three-phase Y-Y transformer bank. Each single-phase transformer is rated 30 kVA, 2300/230-V, 50-Hz. Each of the transformer has the following circuit parameter values: R1 = 0.25 12, X1 = 1.02, R2 = 0.0252, X2 = 0.12, Rc = 15 k 2, XM = 12 k12 = = = (a) Draw the per-phase approximate equivalent circuit of the three-phase transformer referred to the secondary side. If the three-phase transformer is operated at full load with a power factor of 0.9 lagging and at the rated secondary voltage, calculate the voltage regulation and efficiency of the transformer. You may take the secondary voltage as the reference. What is the input power factor? (16 Marks)