1.5  A 10‐pole, 380 ‐V, 50 Hz, D‐connected three‐phase induction motor is rotating a quarry belt conveyor. The machine has the following parameters, referred to the stator, on a per phase basis: Stator Parameters                                                                Winding Resistance................0.19 Ω .........          Winding Reactance.................1.12 Ω..........

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1.5  A 10‐pole, 380 ‐V, 50 Hz, D‐connected three‐phase induction motor is rotating a quarry belt conveyor. The machine has the following parameters, referred to the stator, on a per phase basis:

Stator Parameters                                                               

Winding Resistance................0.19 Ω .........         

Winding Reactance.................1.12 Ω..........  

           

 

Rotor Parameters

Winding Resistance......................0.29 Ω

Winding Reactance.....................1.12 Ω

 

 

Magnetising Reactance................................16.8 Ω

Equivalent Core‐loss Resistance....................900 Ω.

The friction and windage losses are 320 W. When the motor runs at its rated slip of 2.6 %. Determine:

1.5.1        The stator current.                                                                                                  

1.5.2        Estimate the Output torque of the motor under the rated conditions.                    

1.5.3        The Motor efficiency                                                                                             

1.5.4        In an event of scheduled load shading by the electricity supply authority investigate the possibility and provide a solution to supply the motor by a standby‐alternator with the following essential rating: Line voltage 400 V and kVA capacity of 250 kVA.        

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