Three-Phase Transformer Connections

Current Ratio

Combinations of Delta and Wye Transformer Connections

Electrical Science Volume 4 of 4
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TRANSFORMER THEORY Transformers Next, we solve for I_S. I_S N_P N_S I_P I_S 480 60 0.6 amps I_S 4.8 amps The student should note from the previous examples that a transformer that "steps-up" voltage, "steps-down" the current proportionally. Three-Phase Transformer Connections So far, our discussion has dealt with the operation of single-phase transformers. Three-phase transformer operation is identical except that three single-phase windings are used. These windings may be connected in wye, delta, or any combination of the two. Delta Connection In the delta connection, all three phases are connected in series to form a closed loop (Figure 3). Figure 3 Delta Connection Wye Connection In the wye connection, three common ends of each phase are connected together at a common terminal (marked "N" for neutral), and the other three ends are connected to a three-phase line (Figure 4). ES-13 Page 8 Rev. 0

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