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Calculate the value of the short circuit ratio if the per unit value of synchronous reactance is 1.5 Ω.

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Calculate the value of the short circuit ratio if the per unit value of synchronous reactance is 1.5 Ω.

(a) 0.66

(b) 0.33

(c) 0.17

(d) 0.12

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This interesting question is from Induction Motors topic in division Speed Control of Direct Current Motors & Induction Motors of Electric Drives

1 Answer

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Correct option is (a) 0.66

The 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÷1.5=.66.

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