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When a 3–phase alternator is suddenly short–circuited at its terminals, the initial value of the short–circuit current is limited by which one of the following?

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in Electrical Machines by (135k points)
When a 3–phase alternator is suddenly short–circuited at its terminals, the initial value of the short–circuit current is limited by which one of the following?

(a) x”d

(b) x’d

(c) xs

(d) Sum of x”d, x’d and xs

I got this question in final exam.

I'd like to ask this question from Measurement of Xd and Xq topic in portion Synchronous Machines of Electrical Machines

1 Answer

+1 vote
by (888k points)
Right choice is (a) x”d

To elaborate: When suddenly the terminals of the synchronous machine will be short circuited, at that immediate instant it will be subtransient reactance.

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