Three single-phase transformers, each rated \(10 \mathrm{MVA}, 66.4 / 12.5 \mathrm{kV}, 60 \mathrm{~Hz}\), with an equivalent series reactance of 0.1 per unit divided equally between primary and secondary, are connected in a three-phase bank. The highvoltage windings are Y-connected and their terminals are directly connected to a \(115-\mathrm{kV}\) 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) \(\Delta\)-connected.