A 220 V, 870 rpm, 60 Hz, 45 kW, delta connected, class C, 3-phase induction moto

Question

A 220 V, 870 rpm, 60 Hz, 45 kW, delta connected, class C, 3-phase induction motor has the following results when tested: (Class C: X_1 = 0.43 X_2) DC resistance between stator terminals is 0.1 ohm No load test: V = 220 volt line to line P = 1.5 kW 3-phase I = 4A Locked rotor test: V = 15 volt line to line P = 2.4 kW 3-phase I = 75 A Determine the per phase approximate equivalent circuit. Find following parameters: The full load slip. The slip at maximum torque The starting torque in pu. The maximum torque in pu.

Explanation / Answer

Equivalent reactance per phase obtained from calculations will be negative from the blocked rotor test data. so the data provided is not correct, and such machine is not practically feasible

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