Transformer Vector Group

http://skm-systems.blogspot.com/2010/07/transformer-vector-groups.html

Dear Mr.John,

Thank you very much. Very good information about transformer vector group & winding configration.

Four groups: Group I - Yy0,Dd0; II - Yy6,Dd6; III - Yd1,Dy1; IV - Yd11,Dy11. Each hour is 360/12 = 30 degree = Yd = Dy. Yd5 means Delta is +5x30 degree with Star.

For Y/y/D/d xx, the "clock position" is xx; e.g., Yd5 = 5:00.

Dear Kailasamvv,

For study of Vector Group, you may consult any text book on Electrical Machine, e.g. Performance and Design of A.C.Machine by M.G. Say.

For determination of Vector Group, you have to carryout voltage test by shorting of one phase of both primary and secondary terminals of transformer, say R-r and injecting low A.C. voltage at primary side and measure voltage between various terminals like B-b. Y-y, B-r, etc. You may also find the method in text book

Thanks,

Manindra

Dear Mr.Manindra,

Thank you for your explanation.

If you can mail me your e-mail ID thro this forum's mailbox, I can send you an article written by me on transformer vector group and got published in Electrical India Magazine.

Thank you Mr.Electrical Expert,

Kindly please send the article to my mail id

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