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Commonly used terms in the Electrical industry.
wye-delta transformer
a connection of a three-phase transformer with one primary and one secondary which can be considered as three similar single-phase transformers. The primary is connected in wye, that is one terminal from each phase is connected to neutral and one to a line voltage. The secondary is connected in delta, with each phase connected between two line voltages.
wye-wye-delta transformer
a three-phase transformer in which the primary and secondary coils are connected in wye. In order to overcome the problems with the wyewye connection, a set of tertiary coils are connected in delta to provide a path for the triple harmonic components of the exciting current to circulate.