What is mean by vector group in transformers? how we can draw the vector group diagram?

Question

What is mean by vector group in transformers? how we can draw the vector group diagram?

Answer 1

Vector group describes the phase shift between primary and secondary windings. It is important that any transformers connected in parallel are of the same vector group which is why it is put on the transformer nameplate.

A convention has been adopted of using the numbers of a clock face to show vector group i.e. A transformer DY1 has a phase shift of 30 degrees (The D and Y describe the winding type, delta or star).

You can draw the phase shift as any other vector