A 60-Hz synchronous generator having inertia constant H9.94 MJMVA and a transient reactance X0.a per unit is connected to an infinite bus through a transformer and two transmition lines in parallel....

Extracted text: A 60-Hz synchronous generator having inertia constant H9.94 MJMVA and a transient reactance X0.a per unit is connected to an infinite bus through a transformer and two transmition lines in parallel. Reactances are marked on the diagram on a common syst base. The generator is delivering real power of 0.6 per unit, 0.8 power factor lagging to the infinite bus at a voltage ofve12 per unit Assume the per unit damping power coefficient is D= 0,138. Consider a small disturbance of 45 100.1745 radian ( the breakes open and then quickly close). 1. X, -02 a Xy- 03 Spark to X-0.3 to X -03 The damped oscillation frequency in hertz is: Anower: Nest p