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Calculate the value of the short circuit ratio if the per unit value of synchronous reactance is 4.2 Ω.

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Calculate the value of the short circuit ratio if the per unit value of synchronous reactance is 4.2 Ω.

(a) 0.26

(b) 0.23

(c) 0.67

(d) 0.72

This question was addressed to me in an online quiz.

My question is from Induction Motors in portion Speed Control of Direct Current Motors & Induction Motors of Electric Drives

1 Answer

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Right option is (b) 0.23

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÷4.2=.23.

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