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A 3300 V, 3-phase, 50 Hz, star-connected synchronous motor (HELP)

1.     A 3300 V, 3-phase, 50 Hz, star-connected synchronous motor has a synchronous impedance of 2+j 15  per phase. Operating with a line emf of 2500 V, it just falls out of step at full load.

a)  Draw the equivalent circuit of a synchronous motor.                   

b)  To what open-circuit emf will it have to be excited so that it will just remain in synchronism at 50% above rated torque?                                

c)  With this emf , what will then be: the input power; current; and              

 Power factor at full load. 


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