Δ-Y transformer
From Wikipedia, the free encyclopedia
A Δ-Y transformer is the North American term for an electrical device that converts three-phase electric power without a neutral wire into 3-phase power with a neutral wire. It is generally built from 3 independent transformers.
They are known as Delta-Star systems in Europe, where an example would be a distribution transformer with a delta primary, running on three 11KV phases with no neutral or earth required, and a star (or wye) secondary providing three 240v phases and an earthed neutral point.
Δ-Y transformers should not be confused with the Y-Δ transform, which is a mathematical transformation used in circuit analysis.
