current phase imbalance
current phase imbalance
(OP)
my client recently had a utility company phase loss.
After correction, I checked the phases for current.
A phase 1077A, B phase 1116A, C phase 354A
The transformer is a 750kVa 277/480v secondary.
After correction, I checked the phases for current.
A phase 1077A, B phase 1116A, C phase 354A
The transformer is a 750kVa 277/480v secondary.






RE: current phase imbalance
There's clearly a lot of single phase load either connected between A-B, or A-N and B-N, or a combination of both. You could re-distribute the loads to improve balance, but is it actually causing a problem to warrant the effort?
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If we learn from our mistakes I'm getting a great education!
RE: current phase imbalance
RE: current phase imbalance
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: current phase imbalance
Are there 480V single phase loads?
I would also double check the amp readings and check the method, meter, CTs or anything else that is used for the measurements.
Rafiq Bulsara
http://www.srengineersct.com
RE: current phase imbalance
Rafig is correct about the loading. Somehow I feel you need to do some more checking and would love to hear the rest of the story once you get more info.
Alan
RE: current phase imbalance
Alan
"The engineer's first problem in any design situation is to discover what the problem really is." Unk.
RE: current phase imbalance
A 738A B 723A C 696A.
I had the utility company set up ma five day monitor to see what is going on. I checked all larger motors and loads were normal.
Interesting! Any thoughts?????
RE: current phase imbalance
You never mentioned how were they measured and if the second time measuring method was any different.
Rafiq Bulsara
http://www.srengineersct.com
RE: current phase imbalance
Also, voltage was normal both times.
RE: current phase imbalance
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If we learn from our mistakes I'm getting a great education!
RE: current phase imbalance
Rafiq Bulsara
http://www.srengineersct.com
RE: current phase imbalance
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If we learn from our mistakes I'm getting a great education!
RE: current phase imbalance
RE: current phase imbalance