Delta-Wye 34.5 Transformer Connection

[Davecassano]

We now utilize Delta-Wye connected 3 Phase transformers 34.5kv to 480/277y. We are looking at loop feeding a Wye connected 2500kva with a 480v Wye connected secondary. What problems if any might occur if we have any unbalanced loads? Could we see high neutral currents due to unbalanced loading?

 

[jghrist]

The 480/277Y voltage from the delta-wye transformer will be 30? out of phase with the 480/277Y voltage from the wye-wye transformer. They cannot be connected together (it would be like a ?-? fault).