A wattmeter on the main switchboard suddenly swings to a negative reading after a second generator is connected to the bus. What does this indication most likely signify, and what action is required?

1. A. The power factor has dropped below unity; reduce excitation on the incoming generator
2. B. The frequency of the incoming generator is too high; adjust the governor to reduce speed
3. ✓ The generator is experiencing reverse power, meaning it is being motored by the bus; the generator must be tripped to protect its prime moverCorrect
4. D. The current transformer feeding the wattmeter has saturated; the reading is a meter artifact and no action is required