The timer element of a reverse power relay cannot be energized unless what condition is met?

Correct Answer: Option A — the power flow is the same as the tripping direction

Reverse power relays utilize a directional sensing element that must detect power flowing in the exact tripping direction (from the bus into the generator) before the timing element can energize and initiate a protective trip. This prevents spurious operations during normal power fluctuations or transient forward power surges.