Is your excitation feed from a PPT or seperately fed?
On our units the exciter stops at 95% speed to prevent V/HZ limiter from activation. I know that the excitation can assist with providing a drag for steam turbine/generators to allow coast to gear sooner.
regards,
Steve...
I would recommend the following for generator maintenance:
daily:
check temps, pressure, purity of H2 or anything, bearing vibrations, look at collector for any arcing, seal oil system.
monthly:
perform shaft voltage testing, replace brushes as needed.
annually:
inspect general terminals for...
