For example, a step-up transformer with a delta-connected primary, and star- connected secondary, is not written as ‘dY11’, but ‘Yd11’. The As different combinations of winding connections will result in different phase angles between the voltages on the windings, transformers connected in parallel . classic distribution transformers for electric power supply. Oil and gas . Dy11– 20°. 1 x (Dy5 Dd0). +°. 1 x (Dy5 Dd0). –°. 1 x (Dy11–10° Dy Dy11–10°) .

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Also can we have common earthing for neutral and body of transformer. May 7, at 5: According to the Lenzt law the polarity of the secondary winding should not be as such trransformer to oppose the change in flux in primary? January 28, at 9: Chris Aug 21, An AC voltage applied to a coil will induce a voltage in a fy11 coil where the two are linked by a magnetic path.

What is meant by vector group for transformers and why is it important?

I invite your posiblility and suggesstions from author and the group please. I am creating a page about the transformers principle here http: Iam impressed by the explicit information about the transformerand i say congrat and keep it up.


Farhaduzzaman Apr 05, Means more load is sometime on R phasesometimes on Y phase and so on. The secondary windings are connected similarly.

Understanding Vector Group of Transformer (part 1)

Retrieved from ” https: The vector group provides a simple way of indicating how the connections of a transformer are arranged.

Chet Ram Yadav May 16, In star-star transformer how can we do vector group test??

This info is realy useful because the connections of vector groups r confusing me very much but now i understand. Jignesh, Just to remind that reply to my question is still awaited. August 13, at 5: Can the Transformers with vector group Dyn11 or YNyn0d11 be used? Two winding, three transflrmer transformers can be divided into four main categories. The phase angle of the LV winding lags the HV by 30 degrees.

May 7, at 3: Sir,we are designing a 50MVA solar power plant in India. How does clockwise and anticlockwise winding changes the polarity of transfromer secondary winding?

What is meant by vector group for transformers and why is it important?

The Determination of vector group of transformers is very important before connecting two or more transformers in parallel. To find out more, including how to control cookies, see here: The three phase transformer windings can be connected several ways. This means that a 3-phase transformer can have its primary and secondary windings connected the same delta-delta or star-staror differently delta-star or star-delta.


When 3 coils are used in a 3 phase transformer winding a dy111 of options exist. March 26, at 9: I understood that the generator transformer vector group is delta at generator side and star in yard side.

May 29, at August 14, at 3: If not then why.

Email required Address never made public. February 7, at 7: Generally we use Delta — Star Transformer Dyn March 14, at 3: October 13, at 5: When two transformers are connected in parallel, their phase shifts must be identical; if not, a short circuit will occur when the transformers are energized.

Vector Group of Transformer

Moreover, it can be proved that two-phase, two-phase-to-ground and three-phase faults at the one side of such tansformer give the same sag magnitude at the other side of the transformer under common assumptions used in short-circuit analysis. Type your email id here mandatory!

Thank you so much Jignesh sir, For sharing good article. Please reply me Please reply me Thanks again Eng. You are commenting using your WordPress.