I have searched this wonderfully informative website and learned much about Delta-Wye connections and why a phase shift in voltage would exist between the two. I am also aware that both Delta-Delta and Wye-Wye connections do not have this phase shift. My questions is: What is so important about this phase shift? Are there Pros/Cons?
Electronic – What are the Pros/Cons on the 30 Degree voltage phase shift between the primary and secondary of a Delta-Wye Transformer
deltaphase shiftvoltage
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Best Answer
Probably the main point is to be aware that there is a phase shift. For example, series connecting delta and wye secondaries will give strange results with the resultant midway (15°) between the other two. (That's from memory and needs confirmation.)
One useful application is to generate a DC with less ripple. A standard 3-phase rectifier will give 6-pulses of DC per 360°.
Figure 1. 3-phase rectification gives six pulses per 360°.
By rectifying both delta and wye secondaries we can get 12-pulses per 360° and further reduce ripple.
Figure 1. 12-pulse rectifier generated by delta and wye secondaries.
As I hinted earlier, I think further improvement can be obtained by series connecting delta and wye secondaries to create other phases for even more improvement.
Diagrams and quotation from Lessons In Electric Circuits -- Volume III where there is a lot more information.