Discussion of Delta 3ph services. Open, Closed, etc
Discussion of Delta 3ph services. Open, Closed, etc
(OP)
I cannot seem to get a straight answer from most electricians and I think this is mostly out of their scope of expertise and I am not an EE so hoping to get something from the horses mouth.
When discussing Delta connections, some have indicated you may or may not have a high leg. I have NEVER seen a Delta system without a high leg. I am trying to gather some connection drawings of the different Deltas to better understand this. Per my understanding, the open delta uses on 2 transformers and 2 legs of input power to triangulate the 3 phase but still creates a high leg to the neutral reference. This load will largely be unbalanced so is only good for small installations. Closed delta uses 3 cans. I can see no way with either to eliminate the high leg while still offering A and B to neutral loading.
Can someone clarify this is laymen terms for me...??
When discussing Delta connections, some have indicated you may or may not have a high leg. I have NEVER seen a Delta system without a high leg. I am trying to gather some connection drawings of the different Deltas to better understand this. Per my understanding, the open delta uses on 2 transformers and 2 legs of input power to triangulate the 3 phase but still creates a high leg to the neutral reference. This load will largely be unbalanced so is only good for small installations. Closed delta uses 3 cans. I can see no way with either to eliminate the high leg while still offering A and B to neutral loading.
Can someone clarify this is laymen terms for me...??






RE: Discussion of Delta 3ph services. Open, Closed, etc
RE: Discussion of Delta 3ph services. Open, Closed, etc
RE: Discussion of Delta 3ph services. Open, Closed, etc
When three-phase power is needed to a building, best options are 208/120V or 480/277V.
David Castor
www.cvoes.com