A $300[$kVA$],24\mathrm{.}94$Y$/14\mathrm{.}4[$kV$]208$Y$/120.[$V$]$ three$-$phase transformer bank is connected in a Y$-$Y conguration. Each single$-$phase transformer has an equivalent series impedance of Z$$ t $=0\mathrm{.}006660+$ j$0\mathrm{.}1370[$pu$].$ The transformer bank serves the balanced $3-$phase complex power S$3=$ P$3+$ jQ$3$ specied in the exam companion document on the low voltage side, and low voltage phase a voltage is Vean,pu $=0\mathrm{.}9700\mathrm{.}000[$pu$].$

$1)$ Using the transformer rating as the power base, calculate the per$-$unit complex power and express it in rectangular form.

$2)$ Calculate the transformer high$-$side phase A voltage in per$-$unit in polar form to three signicant digits. Hint: VeAN,pu $=0\mathrm{.}9700\mathrm{.}000[$pu$].$

$3)$ Calculate the voltage regulation for this transformer loading to three signicant digits. Hint: V R $=0.$