Given the transformer connection of the primary and secondary winding, in example: Yd11, how do I connect the LV side so I get the correct phase-shift? I understand what clock vector groups represent, and I can draw the vector diagram, but I find it quite hard to connect the LV side to get the correct phase-shift.
Figure 1. Phasor diagrams for the Y-Δ 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.
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.