When a 3-phase alternator is suddenly short-circuited at its terminals, the initial value of short-circuit current is limited by which one of the following:
A. Subtransient reactance X”d.
B. Transient reactance X’d.
C. Synchronous reactance Xs.
D. Sum of X”d , X’d and Xs. [U.P.S.C. I.E.S. E.E.-11, 2004]
Answer:A
When a 3-phase alternator is suddenly short-circuited at its terminals, the initial value of short-circuit current is limited by which one of the following:
A. Subtransient reactance X”d. B. Transient reactance X’d. C. Synchronous reactance Xs. D. Sum of X”d , X’d and Xs. [U.P.S.C. I.E.S. E.E.-11, 2004]