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why 30 degree phase shift occurs in a delta-wye transformer?

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Sorry for the dumb question. :(

I just studied that, 30 degree phase shift occurs on the secondary site of a delta-wye transformer.
But the question is , why ? Why 30 degree? Why not 60 degree or other?
Is there any calculation involved in this? Where can i have them?

Thanks in advance.
 

Re: why 30 degree phase shift occurs in a delta-wye transfor

I dont know my answer is dumber than the question :) Besides joke, it is not a dumb question, actually is very good one.

I was also surprised to learn delta-wye (or vice versa) connection would have 30° shift. The below linnk has a detailed discussion and one PDF document explains it well.

https://www.plctalk.net/qanda/showthread.php?t=47432
 

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