Combinations of Delta and Wye Transformer Connections

Three-Phase Transformer Connections

TABLE 1: Voltage and Current Ratings of Transformers

Electrical Science Volume 4 of 4
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Transformers TRANSFORMER THEORY Figure 4 Wye Connection Combinations of Delta and Wye Transformer Connections A three-phase transformer may have three separate but identical single-phase (1f) transformers or a single 3f unit containing three-phase windings. The transformer windings may be connected to form a 3f bank in any of four different ways (Figure 5). Figure 5 shows the voltages and currents in terms of applied line voltage (V) and line current (I), Figure 5 3f Transformer Connections where the turns ratio (a) is equal to one. Voltage and current ratings of the individual transformers depend on the connections (Figure 5) and are indicated by Table 1 for convenience of calculations. Rev. 0 Page 9 ES-13

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