3. The generator in Problem 1 is now operating at a new steady-state equilibrium point with

PG=1.0 at 0.90 power factor lagging delivered at the infinite bus. Suddenly, circuit breaker

B12 inadvertently opens. Determine:

(a) the pre-disturbance generator internal voltage, and

(b) the maximum value of the generator power angle δ. Hint: use the equal-area criterion

to balance the accelerating and decelerating areas.