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Tranformer Vector Group Selection For 11kV Generator
Vector Group Selection For 11kV Generator

1) 1st incoming supply on 6kV bus of existing panels is coming from utility (Grid Station) through transformer having vector group of yNyn0+d11 (15/20 MVA Trafo, impedance 7.76/10.35,132kV/6kv).

2) 2nd incoming supply on 6kV bus of existing panels is coming from Generator through transformer having vector group of Dyn11 (5 MVA step up Trafo, impedance 7.5, 400/6kv).

3) 3rd Transformer will be that one which I will propose to client. Please suggest me which VECTOR GROUP should I choose for new Transformer that will be suitable for this system. Dyn-11 or YnYn0 or DD-11 or any other? Please Suggest.

3rd Transformer i.e new Transformer, I am going to propose to my client (11/6kV, 4MVA, Impedance 7.5 % and VECTOR GROUP?)

All three incoming supplies with different above sources will run in parallel on common 6kv bus through synchronization.

Please advice vector group for 3rd Trafo.