Calculate unbalanced primary currents
Calculate unbalanced primary currents
(OP)
Can anyone explain how to calculate the individual primary 3phase currents with unbalanced secondary load currents on a DY transformer neutral grounded.
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Calculate unbalanced primary currents
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RE: Calculate unbalanced primary currents
The more complicated way of doing it is to keep the delta primary and calculate the primary currents for each winding and then vector sum the three current pairs to get line current. Both ways of doing it produce the same result.
It works only for non-distorted currents. If you have lots of triplenes, a primary delta and a primary star will yield different results (triplenes cancel in a delta winding).
Gunnar Englund
www.gke.org
RE: Calculate unbalanced primary currents
RE: Calculate unbalanced primary currents
On the other hand. When I think of it. I have. It seemed to work then. As I said, have to find that old book.
Gunnar Englund
www.gke.org
RE: Calculate unbalanced primary currents
Gunnar Englund
www.gke.org
RE: Calculate unbalanced primary currents
RE: Calculate unbalanced primary currents
Once you know the three primary winding currents it's just ol' fashioned vector addition to find the line currents. It is worth sketching the current vectors to help you keep track.
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I don't suffer from insanity. I enjoy it...
RE: Calculate unbalanced primary currents
I think that your Mathcad sheet is on a pretty "pretty" form. But it is not the simple formula I thought existed. I shall dig into it and see what gives.
Gunnar Englund
www.gke.org
RE: Calculate unbalanced primary currents
RE: Calculate unbalanced primary currents
That will keep me occupied for a while...
Gunnar Englund
www.gke.org
RE: Calculate unbalanced primary currents
RE: Calculate unbalanced primary currents