A 400 V, 4 pole induction machine operated as Induction Generator by exciting it using capacitor bank. If its shaft is rotated at 1500 rpm (its synchronous speed), what will be the terminal V? a) 400 b)>400 c)
Dear Swati,
self excitation using capacitors leads to a positive feedback loop, finally limited by the saturation of the magnetic field in the rotor of the machine.
Typically, the rotor in normal operation is not driven to saturation to prevent exessive losses.
Your machine, operated at synchronous speed thus will generate a voltage slightly higher than the rated voltage.
How much higher depends on the machine, so the only way to get an accurate answer is measuring.
Cheers - Martin
as Mr martin said
startup capacitor decrease inrush current with supply ancillary required power to machine.and usually startup voltage is slightly higher than nominal voltage.
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