A delta connected 1185 V, 50 Hz three phase induction motor has a star-connected slip-ring rotor with a phase transformation ratio of 4. 2. The per phase rotor resistance and standstill leakage reactance are 0.0627 ohm and 0.049 ohm respectively. Assuming the stator impedance and magnetizing current are neglected. Calculate the the following iii) The rotor current at 3 % slip with slip-rings are short circuited. (iv) The rotor power factor at 3 % slip with slip-rings are shot (v) The external rotor resistance per phase required to obtain a starting current of 145 A in the stator supply lines.
A delta connected 1185 V, 50 Hz three phase induction motor has a star-connected slip-ring rotor with a phase transformation ratio of 4. 2. The per phase rotor resistance and standstill leakage reactance are 0.0627 ohm and 0.049 ohm respectively. Assuming the stator impedance and magnetizing current are neglected. Calculate the the following iii) The rotor current at 3 % slip with slip-rings are short circuited. (iv) The rotor power factor at 3 % slip with slip-rings are shot (v) The external rotor resistance per phase required to obtain a starting current of 145 A in the stator supply lines.
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A delta connected 1185 V, 50 Hz three phase induction motor has a star-connected slip-ring rotor with a phase transformation ratio of 4. 2. The per phase rotor resistance and standstill leakage reactance are
0.0627 ohm and 0.049 ohm respectively. Assuming the stator impedance and magnetizing current are
neglected. Calculate the the following
iii) The rotor current at 3 % slip with slip-rings are short circuited.
(iv) The rotor power factor at 3 % slip with slip-rings are shot
(v) The external rotor resistance per phase required to obtain a starting current of 145 A in the stator supply
lines.
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