tranformer 1

[ajayshah]

why dy11 insted of dy0

 

[vic3fan]

It's not the same:
11 x 30 deg = 330 deg, or (360-330)= -30 deg

0 x 30 deg = 0 deg.

 

[vic3fan]

Sorry, I meant (330-360)= -30 deg.

 

[rcw retired EE]

Dyn11 & Dyn1 are easy to build. The plus or minus 30 degree phase shift in the terminal voltages of a Y1 or Y11 is inherent in the delta to wye winding configuration. To do a Dy0 requires more phase shifting windings or a convoluted interconneciton of multiple secondary windings that is not practical. If 0 degree phase shift is needed to match exisitng system phassing look at using YNdyn0 (small tertiary delta winding to handle 3rd harmonics) or a YN-yn0 transformer.

 

[RalphChristie]

Read through this article for the pro's and cons on the different transformer winding arrangements:

http://www.beckwithelectric.com/powerlines/powerlines-37.html

For additional info see faq238-1090.

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