Q17/ A 1100V, 50HZ, delta-connected induction motor has a star-connected slip ring rotor witha phase transformation ratio 3.8. The rotor resistance and standstill leakage reactance are0.0122 and 0.252 per phase respectively. Neglecting stator impedance and magnetizingcurrent, determine (i) the rotor current at start with slip rings shorted (ii) the rotor powerfactor at start with slip rings shorted (iii) the rotor current at 4% slip with slip rings shortedTutorial Sheet (1)(iv) the rotor p.f. at 4% slip with slip rings shorted (v) the external resistance per phaserequired to obtain a starting current of 100 A in stator supply lines.Ans [1157A , 0.048 lag , 742.3A , 0.77 , 0.7072]

Concept: The Formulas used to determine different parts of the Question are, Rotor Current (I)=Rotor…

Answered: Q17/ A 1100V, 50HZ, delta-connected…

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