Page 127 - Electromechanical Devices and Components Illustrated Sourcebook

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Chapter 5 Magnetic Components 89

Core Core
Secondary Coils Primary Coils Secondary Coils
Primary Coils

Input (Delta) Output (Delta)
Output
Input (Wye)
(Delta)
Input
(Wye) Neutral
Neutral

Figure 5-21 Delta-Wye Conﬁgured Three-Phase Transformer
Schematic

Figure 5-19 Wye-Delta Conﬁgured Three-Phase
Transformer Schematic

Core
Secondary Coils
Primary Coils
Coil Sets Terminals

Core
Output (Delta)
Input (Wye) Input (Wye)

Neutral Neutral
Figure 5-22 Commercial Three-Phase Transformer

Figure 5-20 Wye-Wye Conﬁgured Three-Phase
Transformer Schematic
Three-Phase
Output

three coil sets instead of one. Figure 5-22 shows a typical
commercial three-phase transformer. Note that the terminals
for each coil set are independent from the other coils. This
allows the input and output to be conﬁgured to either Delta or
Wye.
Three single-phase transformers may be conﬁgured to
Three-Phase
operate as a three-phase unit if they are wired correctly. Input
Figure 5-23 shows three single-phase transformers conﬁgured Single-Phase Transformer
for Delta input and output. 3 Places
Large power distribution stations use large three-phase Figure 5-23 Three-Phase Transformer Conﬁgured Using
transformers. These units may be isolation or autotransformers, Three Single-Phase Units

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