I know there is a phase shift between the primary and secondary of a Delta-wye transformer of 30degrees with the voltages of the primary delta leading the voltages of the secondary by 30degrees. But I'm looking to clarify how exactly these voltages are represented with respect to this difference.
Since the primary is always delta connected do we always take these voltages to be L-L voltages such as Vab@0deg, Vbc@-120deg, and Vca@-240deg? Or do we refer to these primarys as their L-N voltages.
Sticking with the L-L convention above and referencing the secondary voltages the L-N voltages are all shifted by 30deg with Van@-30, Vbn@-150, and Vca@-270. But what about the L-L voltages of the secondary wye connection. Does Vab on the secondary have the same angle as VAB on the primary. I'm confused weather or not this 30deg shift is in referencing between the L-L primary and L-N secondary voltages, or both the L-L primary and secondary voltages?
If we took one of the primary phases to neutral would this be in phases or would it be shifted from the seconary to neutral of the same phase?