Induction Generators Unbalanced Current
Induction Generators Unbalanced Current
(OP)
A 3-phase induction generator has balanced terminal voltages but an unbalance in the currents. One phase current is about 25% lower than the other two. Voltages are balanced to the low-side of the step-up transformer.
What can cause this and what tests (simple) can be performed to find out what the problem(s) could be?
What can cause this and what tests (simple) can be performed to find out what the problem(s) could be?





RE: Induction Generators Unbalanced Current
Does history tell you that what your seeing is 'abnormal'?
RE: Induction Generators Unbalanced Current
The current unbalanced condition is new.
RE: Induction Generators Unbalanced Current
RE: Induction Generators Unbalanced Current
We see unequal loading like this all the time on our generators and is a result of unequal single phase loads somewhere on the transmission/distribution system. It is not easily fixed but since you have not seen this in the past it could be indicated a potential problem. Sorry I can not help pinpoint potential problem areas. But check all connections with a resistance test and it may not hurt to check your transformer as well (doble or other).
RE: Induction Generators Unbalanced Current
Rotate the generator lines connected to the load.
If the unbalanced currents follow the generator terminals you have some impedance problem in the generator. If the unbalanced current stays in the load terminals, your “infinite bus” is unbalanced and the correction is out of your control.
RE: Induction Generators Unbalanced Current
RE: Induction Generators Unbalanced Current
Also, i beleive tha MG standard allow derating generator starting 1% of voltage unbalnace, it seems for starting as very restrictive limit but this will be uppon the strenght of the grid and i beleive for 5% voltage unbalance you have to derate your generator of about 25%