A generator delivers power of 1 pu to an infinite bus through a purely reactive network. The maximum power that could be delivered by generator is 2 pu. A three phase fault occurs at the generator which reduces the generator output to zero. The fault is restored after ‘tc’ seconds. The maximum swing of rotor angle is found to be δmax = 110o electrical. The rotor angle at ‘tc’ is ________ electrical deg.

A generator delivers power of 1 pu to an infinite bus through a pure

1.	A generator delivers power of 1 pu to an infinite bus through a purely reactive network. The maximum power that could be delivered by generator is 2 pu. A three phase fault occurs at the generator which reduces the generator output to zero. The fault is restored after ‘tc’ seconds. The maximum swing of rotor angle is found to be δmax = 110o electrical. The rotor angle at ‘tc’ is ________ electrical deg.
A.	69.14o
B.	159.14o
C.	63.08o
D.	65.7o
Answer» B. 159.14o