circuit breaker trips starting a dec 125 AVR

[mottt]

I got a 1700 kva generator and i got a dec 125 avr, we have C curve circuit breaker and trips, the thing i want to know if i could expect a trip from the magnetic side of the circuit breaker... cause of the inrush current?

 

[waross]

I have never had an inrush problem with an AVR (not to say that it is not possible). I would suspect a failed AVR, a faulty breaker or an under rated breaker. Another possibility is the wrong voltage applied to the AVR.

Bill
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"Why not the best?"
Jimmy Carter

 

[mottt]

yes, not usual, i know decs 100 and 200 AVR use a PWM control of excitation, this means that you got the full voltaje each time... and as you got a low resistance R circuit, at first moment you got to magnetice.... i´ll like to know if this avr dec125 got the same system?

 

[waross]

With DC the current is limited by the load resistance and the rate of rise is determined by the the time constant of the circuit. (Time constant is a function of the induction and the resistance of a circuit).
No inrush but the time to reach full current may vary with different circuits.
The AC inrush will approach the normal DC current.
I don't think that you will see a DC inrush, so there should be no inrush reflected back to the AC supply.
A partially shorted field will cause higher than normal AC current.

Bill
--------------------
"Why not the best?"
Jimmy Carter