What is the vector diagram of a transformer?

How does make vector diagram of transformer?

• Answer:

  For three phase power transformers, the vector diagram is a simple drawing showing the relationship between phase windings on the primary and secondary of the transformer. For instance, a delta-connected primary and star-connected secondary would be important information to show, as well as the relative phase relationship between them, and whether the neutral of the star-connected winding is earthed. In electrical engineering courses, you have probably sketched transformer vector diagrams to show each of the winding connection, without realizing that this is called a 'vector diagram'.