Easy understanding of 3-phase transformer connections 3. Delta–Wye. The delta–wye connection is the most commonly used three-phase transformer connection. The wye-connected secondary allows single-phase load to be distributed among the three phases to neutral instead of being placed all on one winding as with a four-wire delta secondary. Three Phase Transformer Connections and Basics Three Phase Transformer Star and Delta Configurations. But what do we mean by “star” (also known as Wye) and “delta” (also known as Mesh) when dealing with three-phase transformer connections. A three phase transformer has three sets of primary and secondary windings. Delta-Delta Transformer Connection Overview Disadvantages of Delta-Delta Transformer Connection. Due to the absence of neutral point it is not suitable for three phase four wire system. More insulation is required and the voltage appearing between windings and core will be equal to full line voltage in case of earth fault on one phase.
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