Generator refurbishment
Generator refurbishment
(OP)
Hello,
I have an older (1950s) 1000 kva, 2400V, generator from a hydro unit that has been stored outside for a year before being moved inside. This unit needs to be refurbished prior to being put back into service. Unit was removed from service due to hydro turbine failure.
I need to send it out to a shop but I would some opinions on the work that I should have done to the unit. I'm looking at testing (before & after) of the stator and poles, cleaning, etc.
I thank you in advance for any responses.
I have an older (1950s) 1000 kva, 2400V, generator from a hydro unit that has been stored outside for a year before being moved inside. This unit needs to be refurbished prior to being put back into service. Unit was removed from service due to hydro turbine failure.
I need to send it out to a shop but I would some opinions on the work that I should have done to the unit. I'm looking at testing (before & after) of the stator and poles, cleaning, etc.
I thank you in advance for any responses.





RE: Generator refurbishment
RE: Generator refurbishment
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Generator refurbishment
RE: Generator refurbishment
Dunno.....depends on what the shop finds and what they think the best repair methods to employ. Stoving is not always 100% effective and the results are often unpredictable. You can stove damp windings off easily enough but when they cool the IR can drop again as you correctly say, given that the insulation material is some 50yrs old its a strong possibility that this may happen. The usual procedure is to stove to about 120degC, if the IR comes up, re-dip while still warm and cure off. Its also possible that the IR may not rise at all, I wasnt around 50yrs ago and wouldnt like to say how the older materials may perform against the newer. There must have been improvements and older insulation is probably not as tolerant to moisture as modern insulation is. If it was in my shop I would say stove it for 12 hours at 120, let it cool to ambient and take a reading, then leave it for a few days to see if it starts drawing in moisture from the atmosphere, take another reading and go from there.
RE: Generator refurbishment
kind regards, Mark
RE: Generator refurbishment