When three-phase transformers are connected as a wye or delta, the primary and secondary windings themselves become the phases of a three-phase connection. This is true whether a three-phase transformer is used or whether three single-phase transformers are employed to form a three-phase bank.

Question

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When three-phase transformers are connected in a wye or delta configuration, the primary and secondary windings become the phases of a three-phase connection. This applies to both three-phase transformers and three single-phase transformers arranged in a three-phase bank.

When Three-Phase Transformers Are Connected as a Wye or Delta