Generator rotation
Generator rotation
(OP)
Hi everyone.
I have an application where a 2MVA alternator was retrofitted to a new prime mover. During the change the alternators direction of rotation was changed. I understand the cooling fan was also changed to accomadate this. The alternator has had a troublesome time(several years), lots of over heating, burnt windings once. Could this change of direction have contributed to the issues and if so how?
Many thanks to you all in advance who respond.
Norske
I have an application where a 2MVA alternator was retrofitted to a new prime mover. During the change the alternators direction of rotation was changed. I understand the cooling fan was also changed to accomadate this. The alternator has had a troublesome time(several years), lots of over heating, burnt windings once. Could this change of direction have contributed to the issues and if so how?
Many thanks to you all in advance who respond.
Norske






RE: Generator rotation
RE: Generator rotation
RE: Generator rotation
Presently, our generators have cooling fans mounted on the periphery of the rotor body. Apparently, this fans, once reversely installed on the fixed point the air blow direction is reversed, maybe blowing air inside or outside the generator winding as sslobodan pointed out.
With this, we're very careful upon disassembly of this fans in order to prevent reverse air blowing effects.
"..the more, the merrier" Genghis Khan
RE: Generator rotation
Another possibility is that the rotor is not longitudinally aligned properly.
Check your protection, the new prime mover may be overpowering the generator. Normally this is not a problem, but a previous protection scheme may have had the settings too high and relied on the maximum power limit of the prime mover to avoid damage. A more powerful prime mover and bad settings may be a possibility.
respectfully
RE: Generator rotation
RE: Generator rotation
If you have any pictures of the rotor when it was removed from the stator, check to see if there are a bunch of holes throughout the rotor casing. That's your clue.
JB
RE: Generator rotation
rmw
RE: Generator rotation
Did the new engine speed match that of alternator ? If not, it could be a V/Hz situation that is overheating the core (and hence the windings).
*Nothing exists except atoms and empty space; everything else is just an opinion*
RE: Generator rotation