$9\mathrm{.}20$ A $500-$MVA, $13\mathrm{.}8-$kV synchronous generator with $x_d^{\text{'}\text{'}}=x_2=0\mathrm{.}20$ and $x_0=0\mathrm{.}05$ per unit is connected to a $500-$MVA,$13\mathrm{.}8-kV\frac{}{500}-kV$ Y transformer with $0\mathrm{.}10$ per$-$unit leakage reactance. The generator and transformer neutrals are solidly grounded. The generator is operated at no$-$load and rated voltage, and the high$-$voltage side of the transformer is disconnected from the power system. Compare the subtransient fault currents for the following bolted faults at the transformer high$-$voltage terminals: three$-$phase fault, single line$-$to$-$ground fault, line$-$to$-$line fault, and double line$-$toground fault.