What are the phases in a delta-wye transformer?
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A delta-wye (Δ-Y) transformer is a three-phase transformer that links the primary winding in a delta configuration to the secondary winding in a wye (star) configuration.
Below are the phases & their characteristics:
Primary Side (Delta Configuration)
In a delta arrangement, the principal windings form a triangle loop that connects Phases A, B, and C. Each phase is linked to a corner of the delta. This configuration does not include a neutral point.
Secondary Side (Wye Configuration)
Phases A’, B’, and C’: In a wye layout, one end of each secondary winding is joined to produce a neutral point, with the other ends connected to the load.
The neutral point (N) is formed by the secondary windings’ common connection points. This neutral may be grounded (or) left floating, depending on the system’s needs.
Voltage Relationships
Line-to-Line Voltage (Primary)
The voltage measured across any two phases in a delta design.
Line-to-Neutral Voltage (Secondary)
The voltage between any phase and the neutral point in a wye setup.
Line-to-Line Voltage (Secondary)
The voltage measured across any two phases in a wye setup.
Phase Shift
A delta-wye transformer usually causes a phase shift among the primary & secondary windings. In the usual setup:
30-Degree Phase Shift
The secondary (wye) voltages are shifted +30 degrees relative to the primary (delta). This signifies that the secondary voltage is 30° ahead of the primary voltage.