Try to measure the per phase winding resistance and also, if possible, the split phase winding resistance in order to make sure that all the phases have the same resistance. This is to see if there were any wrong connections made during the rewind.
thanks jplinn
But I still am interested in knowing how to divide generators into groups based on for example MW, insulation class, etc.... for comparison of test results with in that group.
I would appreciate any input in this regard.
It certainly appears that the harmonics are due to the way the generator has been rewound. However at this point I may add that there could be two major external sources of harmonics; 1- excitation system, 2- station battery charger because both have rectification equipment.
Is it possible to...
Normally the test results of a piece of equipment are compared with its previous tests and also with test results of similar equipment. Would it make sense to compare it with the same kind of equipment but with different specifications?
For example if we have a 10 MW, 13.8 kV, insulation class...
The megger results for the generator are really good and almost the same as the last test in performed in May 2003. We haven't yet operated the unit but hope that it should be fine.
Thanks for all your suggestions, replies, information and suggestions.
X2K3 (Electrical)
"PT connected in open delta should have one[middle] phase grounded. Was the ground connection intact?"
I would rather disagree... Pts connected in Y have their Y-point grounded but not PTs in open delta.
Please feel free to correct me, if I am wrong?
DanDel
What I meant by not blown completely was that the 95% of the casing was still in tact.... normally its just shattered completely!! It was open of course.
rbulsara (Electrical)
The PTs are in open delta for voltage regulation.
The generator was not developing voltage.
jbartos (Electrical)
Can you please explain the phenomenon of ferroresonanne and its effect on the fuse in a bit more detail. Sounds really interesting.
DanDel (Electrical)
The...
We have a 3.6 MW Hydro Electric Power Generator. The unit was shut down for a couple of days and when we attempted to start it, it won't develop voltage. We found that one of the generator PT High Tension side fuses was sort of blown. I said sort of because it’s damaged in the center. I think if...
I need some good links explaining the working of Thermo Electric Generators (in which a bi metal junction is heated to generate electricity).
I would appreciant all help.
Thanks
edison123
1-There is a thin film of oil on the sliprings.
2- The oil leaksge cannot be stopped at this point in time, because its needs some modification and for that the unit has to be stopped. An outage cannot be afforded now.
I really appreciate and respect edison123 and jbartos because I...
edison123
1. Actually the brush wear was there but not to this extent. This excessive wear has been noted after the annual maintenance of the units last spring.
2. The slip rings on the both the units are identical. Brushes were replaced during the annual maintenance. It’s the same kind and...
We have two hydroelectric generators of 100 MW each. Unit 2 has more wear of carbon brushes on the slip ring than unit 1. Under the same operating conditions (load, field volts, field amps) the temperature of the slip ring of unit 2 is 25 C higher than unit 1. The brushes are of the same make...
