In a 3-phase, slip-ring induction motor, the open circuit voltage across slip-rings is measured to be 110V with normal voltage applied to the stator. The rotor is star-connected and has a resistance of 1Ω and a reactance of 4 Ω at standstill condition. Find the rotor current when the machine is (a) at standstill with slip rings joined to a star-connected starter with a resistance of 2 Ω per phase and negligible reactance (b) running normally with 5% slip.

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In a 3-phase, slip-ring induction motor, the open circuit voltage across slip-rings is measured to be 110V with normal voltage applied to the stator. The rotor is star-connected and has a
resistance of 1Ω and a reactance of 4 Ω at standstill condition. Find the rotor current when the machine is (a) at standstill with slip rings joined to a star-connected starter with a resistance of 2 Ω per phase and negligible reactance (b) running normally with 5% slip.

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