Wye and Delta Connections
The two common methods of connecting three-phase generators, motors, and transformers are shown in figure 17. The method shown in at figure 17a is known as a delta connection, because the diagram bears a close resemblance to the Greek letter ), called delta.
The other method, figure 17b, is known as the star or wye connection. The wye differs from the delta connection in that it has two phases in series. The common point “O” of the three windings is called the neutral because equal voltages exist between this point and any of the
When windings are connected wye, the voltage between any two lines will be 1.732 times the phase voltage, and the line current will be the same as the phase current. When transformers are connected delta, the line current will be 1.732 times the phase current, and the voltage between any two will be the same as that of the phase voltage.
Figure 17 – Three-Phase Connections Wye and Delta Connections
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