In the three phase transformers, each core column has the original winding and secondary, is the equivalent of a single-phase transformer. Three phase transformer high voltage winding's beginning marks with common A, B, C, and the ends with X, Y, Z Low-voltage windings starts with a, b, c and ends with x, y, z High and low voltage windings of the three transformer are connected in the shape of star or delta. In the low-voltage winding, the three transformer's output is also low voltage. Three phase transformerwith high current (such as electroplating transformers)requires to reduce low-voltage wire winding area, and its low voltage winding also using six-star linking method. In China, the three transformer use Y / Y 0 -12, or Y / Triangle -11 knot linking method. Number 12 and 11 present the phase gap between the original winding and the secondary winding. In the three phase transformer, the issue of junction and parallel are very meaningful.

Mastering the knowledge of the three phase transformer is very helpful for applying it.