Chapter 3, Problem 3.43P

Three single-phase transformers, each rated $\text{1}0\text{ MVA},\text{ 66}.\text{4}/\text{12}.\text{5 kV},\text{ 6}0\text{ Hz},$ with an equivalent series reactance of 0.1 per unit divided equally between primary and secondary, are connected in a three-phase bank. The high-voltage windings are V-connected and their terminals are directly connected to a 115-kV three-phase bus. The secondary terminals are all shorted together. Find the currents entering the high-voltage terminals and leaving the low-voltage terminals if the low-voltage windings are (a) Y-connected and (b) $\text{Δ-}$ connected.