Single-phase transformers use the ratio between the primary and secondary windings to step up the input voltage. Three-phase transformers work the same way, but they are configured differently. Instead of a primary and a secondary winding, three-phase transformers have primary and secondary cores. Each core consists of three single-phase windings, one winding for each line.
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Distribution transformer, non linear transformer, power transformer - Delta Transformers
Follow the video session-by-session with this handy book. Color illustrations throughout. This minute video explains how common types of overhead transformers can be connected together. Covers both single-phase and three-phase transformers, with emphasis on three-phase connections of three single-phase transformers. Presents connection theory using phasor diagrams and demonstrates how each of the connections is made. Covers how to make three-phase connections in the following configurations: delta-wye, wye-delta, alternative delta-delta, and alternative wye-delta.
A neutral wire can be provided on wye output side. It can be a single three-phase transformer, or built from three independent single-phase units. An equivalent term is delta-star transformer. Delta-wye transformers are common in commercial, industrial, and high-density residential locations, to supply three-phase distribution systems. An example would be a distribution transformer with a delta primary, running on three 11 kV phases with no neutral or earth required, and a star or wye secondary providing a 3-phase supply at V, with the domestic voltage of available between each phase and the earthed grounded neutral point.
In the U. A higher input voltage allows more power to be drawn from the incoming ac at a lower current. Typically high-voltage power is transmitted from the power generation plants to local substation transformers where it is reduced in voltage and then to facilities in a delta configuration. Note that a delta configuration only uses three wires and has no neutral or ground wire. This saves the cost of a fourth wire, which is unneeded during transmission.