Power system stability question $($electrical engineering$)$

A three$-$phase, $60$ Hz $,$ synchronous generator with an inertia constant $\backslash ((\backslash$mathrm$\{$H$\})\backslash )$ of $3\mathrm{.}58$ s is connected to an infinity bus through a transformer and two parallel transmission lines. One of the transmission lines is series compensated. The impedance diagram of the power system is shown in Fig. Q$1$ with all impedances expressed in per unit on a common base. Under steady state conditions, the generator delivers $0\mathrm{.}9$ pu active power, with its terminal voltage at $1\mathrm{.}06$ pu $.$ A sudden three$-$phase short circuit occurs on Line$-1($uncompensated line$),$ very close to the transformer end. The fault is cleared by removing Line$-1$ from the circuit.

a$)$ Determine the generator internal voltage and power angle before the fault.

b$)$ Write the swing equations for the machine $($i$)$ before the fault, $($ii$)$ during the fault, and $($iii$)$ after clearing the fault.