Consider a Bank of Three Single-Phase Two-Winding Transformers Whose High-Voltage $13.8-\mathrm{kV}$

Consider a bank of three single-phase two-winding transformers whose high-voltage terminals are connected to a three-phase, $13.8-\mathrm{kV}$ feeder. The low-voltage terminals are connected to a three-phase substation load rated 2.4 MVA and $2.3 \mathrm{kV}$ . Determine the required voltage, current, and MVA ratings of both windings of each transformer, when the high-voltage/low-voltage windings are connected (a) $\mathrm{Y}-\Delta$ , (b) $\Delta-\mathrm{Y}$ , (c) $\mathrm{Y}-\mathrm{Y}$ , and (d) $\Delta-\Delta$ .