Transformer vector group
simulate this circuit &ndash; Schematic created using CircuitLab

Figure 1. Phasor diagrams for the Y-&Delta; transformer. 

The original diagram is badly drawn with inconsistent use of colour. 


Since the each primary and secondary pair share a leg of the transformer core the voltages in each winding have to be in phase. This is indicated on Figure 1a where the connected phasors represent the primaries.
Figure 1c shows the result when the secondaries are connected in delta.








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Figure 2. (a) shows both the P-N and P-P phasors.

In Figure 2 we can see that if we were to analyse using the phase to phase (P-P) phasors that there is a phase shift between (a) and (c).


  in example: Yd11, how do I connect the LV side so I get the correct phase-shift?


You just connect them up in Y and D and the phase shift will be automatic. I think you should look for a better text book than your image came from.