electric generator field breaker
electric generator field breaker
(OP)
When a 3 phase electric generator is on line (generator using rotating brushless exciter), is it advisable or necessary to underexcitate the generator in order to open the field breaker, before opening the Circuit breaker?. Also is it advisable to provoke negative excitation?






RE: electric generator field breaker
It is common in AVR circuits to have a free wheeling diode or blocking diode to protect against the collapsing field of the generator when the unit is taken off line.
When you mentioned negative excitation are you referring to under excited, or absorbing VARS from the system? Check the generator capability curve for your machine. This will show where you can safely run the unit without overheating or stability problems.
Pintalo
RE: electric generator field breaker
RE: electric generator field breaker
It is common in AVR circuits to have a free wheeling diode or blocking diode to protect against the collapsing field of the generator when the unit is taken off line.
When I mentioned negative excitation I was referring to inverted pulse, of couse we operate the generator under the capability curve. Because this is important for safely run the unit without overheating or stability problems.
Thank pintalo & jbartos, for this valuable post!
RE: electric generator field breaker
The generator excitation is supposed to be automatic. Why to provoke the negative excitation?
Is there a generator operation exam pending?