Tranformer Vector Group Selection For 11kV Generator

U

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ugmzero1

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.
 
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