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For a 400 V, 3 phase alternator gives an open circuit voltage of 380V and armature current of 38A at a field current of 20A. Then the synchronous reactance of the machine is?

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For a 400 V, 3 phase alternator gives an open circuit voltage of 380V and armature current of 38A at a field current of 20A. Then the synchronous reactance of the machine is?

(a) 10 ohm

(b) 38/√3

(c) 19 ohm

(d) 1.9 ohm

The question was asked in homework.

I need to ask this question from Two Reaction Theory of Salient Pole Machines topic in portion Synchronous Machines of Electrical Machines

1 Answer

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Correct choice is (a) 10 ohm

Explanation: Z = Vt/Ia at the same field current = 380/38 = 38 ohms.

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