Function capacitor for induction generator

I strongly advice you to check if you are not refering to operate a synchronous motor on an overexcitation way. In fact, when this occur, the syncronous motor will electrically behave like a capacitor and, therefore, used tocorrect powe factor of an inductive load.

regards

I've started three 1 MW each and a 70kW induction generators. They pull a lot of amps to excite when they hit the line, I am told it can be about 5 times rated current, overcurrent relays must have a timer on the trip circuit.

An induction generator needs capacitors in a nearby substation for kVARS for excitation. Expect large current flows between the caps and the induction generators.

One of the generators had an inductor in series with the generator windings to limit inrush current, when the generator was at maybe 50% load the inductor was shorted with a breaker.

All of these induction generators were hooked up to hydro turbines for prime movers.

The capacitor is for correcting power factor of the generator.

Voltage can only be altered by the excitation

In all generators, frequency is dependent upon the speed of the generator shaft and the number of poles, voltage and current have nothing to do with frequency which is down to these two mechanical factors.