Final answer:
A Phase-to-phase transformer is not designed to have the rated voltage applied to only one primary bushing.
Step-by-step explanation:
A Phase-to-phase transformer is not designed to have the rated voltage applied to only one primary bushing. In a Phase-to-phase transformer, the voltage is applied to both primary windings simultaneously. This type of transformer is used in three-phase power systems, where each primary winding is connected to a different phase. The secondary windings of a Phase-to-phase transformer are designed to produce the desired transformed output voltage.