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What Is a Wye Delta Connection?

A Wye-Delta connection refers to one of four three-phase transformer configurations. Three-phase transformers are used extensively in industrial power applications because of greater efficiency and up to 173 percent greater power transmission capability than single phase systems.

  1. Wye Connection

    • A Wye connection consists of three transformer windings configured like the letter Y. Each leg shares a common connection. The voltage between any two windings is equal, but the voltage between any leg and a common connection is .577 of the voltage between legs.

    Delta Connection

    • A Delta connection consists of three transformer windings configured in a triangle. The voltage between any two legs is equal.

    Wye-Delta Connection

    • In a Wye-Delta configuration, transformer primary windings are in a wye configuration and the secondary windings are connected in a delta configuration. A common application is for stepping down high voltage from the power transmission line to a commercial voltage level.

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