Smart $ said:
Is the term "open wye" a technically correct terminology by IEEE standards?
An open wye transformer bank has two transformers.
The classic application for an open wye exists when the PoCo, for whatever reason, only has two of three primary conductors (phases) coming to the transformer bank, and the PoCo wishes to supply 3 ? to a customer.
The PoCo will put two transformers on the pole and connect the primary windings in an
open wye. The third wye connected primary winding is not there.
The secondary windings of the two transformers will be hooked up in the classic
open delta. The customer will receive, typically, 120 / 240 V , 4 wire 3 ? with a wild leg.