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Calculate the condition for maximum voltage regulation in the synchronous machine.

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Calculate the condition for maximum voltage regulation in the synchronous machine.

(a) Φ=ϴs

(b) Φ=2ϴs

(c) Φ=4ϴs

(d) Φ=8ϴs

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

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The correct choice is (a) Φ=ϴs

Easy explanation: Voltage regulation is maximum in case of inductive load. The condition for maximum voltage regulation is when the power factor angle of the load becomes equal to the impedance angle. V.R=Rp.ucos(Φ)+Xp.usin(Φ). Differentiate V.R with respect to Φ and put it equal to zero. We will get tan(Φ) = Xp.u÷Rp.u=tan(ϴs) then Φ=ϴs.

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