Step up transformer vector group

[Diarymh]

Hello

I got a vector group design for one step up transformer which is delta/star ,the function of the transformer is to step up generator voltage from 400V to 33kV and then connect with 33 kV switch gear as ATS. I was compelled to find a solution for the neutral in 33kV side via reactors.
I think this vector group is not correct.
my concern is what should be the right vector group of above transformer and why?