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Calculate the value of the short circuit ratio if the per unit value of synchronous reactance is 1 Ω. Assume armature resistance is 0 ohm.

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Calculate the value of the short circuit ratio if the per unit value of synchronous reactance is 1 Ω. Assume armature resistance is 0 ohm.

(a) 1

(b) 2

(c) 3

(d) 4

This question was addressed to me in examination.

I need to ask this question from Induction Motors in chapter Speed Control of Direct Current Motors & Induction Motors of Electric Drives

1 Answer

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Right answer is (a) 1

Easy explanation: The value of the short circuit ratio determines the stability of the synchronous machine. It is inversely proportional to the per unit value of reactance. SCR=1÷Xs(p.u)=1÷1=1.

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