Q: Explain the operation of variable frequency transformer?
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Ans :A variable frequency transformer is used to transmit electricity between two asynchronous alternating current domains.
A variable frequency transformer is a doubly-fed electric machine resembling a vertical shaft hydroelectric generator with a three-phase wound rotor, connected by slip rings to one external ac power circuit.
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A direct-current torque motor is mounted on the same shaft.
Changing the direction of torque applied to the shaft changes the direction of power flow; with no applied torque, the shaft rotates due to the difference in frequency between the networks connected to the rotor and stator.
The variable frequency transformer behaves as a continuously adjustable phase-shifting transformer. It allows control of the power flow between two networks .
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