The implications of a faulted transformer on an open wye-open wye bank include which of the following?

In the context of a faulted transformer in an open wye-open wye bank, the issue at hand primarily revolves around how the system is affected by the fault. A fault in the transformer can lead to lower overall capacity of the transformer bank. This occurs because a fault typically causes one or more phases of the transformer to become inoperative or less effective. Consequently, the total power that can be effectively managed by the system is reduced, resulting in a lower operational capacity.

Furthermore, the open wye configuration means that a fault does not promote balanced loading across the bank, often leading to uneven voltage levels and further crippling the capacity of the system. This situation illustrates that when a transformer fails or is faulted, the output and functionality of the entire bank can significantly diminish.

The other options do not apply in this scenario because a fault generally does not lead to increased efficiency or voltage improvement; it usually leads to operational challenges. Enhanced safety features also do not directly correlate with a faulted transformer, as the presence of a fault can often lead to hazardous conditions rather than improving safety. Thus, the lower capacity resulting from a faulted transformer is the most accurate reflection of the implications in an open wye-open wye bank configuration.