A large ac generator supplying power to an infinite bus, has a sudden short circuit occurring at its terminals. Assuming the prime mover input and the voltage behind the transient reactance to remain constant immediately after the fault, the acceleration of the generator rotor is
A. inversely proportional to the moment of inertia of the machine.
B. inversely proportional to the square of the voltage.
C. directly proportional to the square of the short-circuit current.
D. directly proportional to the short-circuit power. [U.P.S.C. I.E.S. 1994]
Answer:A
A large ac generator supplying power to an infinite bus, has a sudden short circuit occurring at its terminals. Assuming the prime mover input and the voltage behind the transient reactance to remain constant immediately after the fault, the acceleration of the generator rotor is
A. inversely proportional to the moment of inertia of the machine. B. inversely proportional to the square of the voltage. C. directly proportional to the square of the short-circuit current. D. directly proportional to the short-circuit power. [U.P.S.C. I.E.S. 1994]