About vector group concept of transformers

[klmnopq]

How we speak about the coil of primary in phase of a versus secondary coil
this is accepted (as there is on same core)

But question about
we say this transformer (ex) is vector group Dy11
that means phase difference between primary and secondary voltage is 330 angle
!

It's conflicted with that versus coil are the same phase

!

 

[Windadct]

I have no idea what you are asking - DY11? Delta Wye? --- first part of your question seems to be about a single phase transformer, then second part a 3 phase?