If these are significant, the A-C winding will need to be sized accordingly or the entire three-phase transformer will need to be sized for worst-case. As I mentioned, one benefit of the Closed Delta ...

Typically, a three-phase supply is generated when a series of three-windings spaced 120° apart are rotated at 3000 rpm (50 rps) within a magnetic field (Figure 1).

Three phase power transformer secondaries that are set up in a delta configuration do not have an earthing or grounding point. By contrast, a wye configuration of windings would provide such a point, ...