Which action is described as automatically occurring outside the generating station when rotation is abnormal?

Which action is described as automatically occurring outside the generating station when rotation is abnormal?

• A. The main breaker trips
• B. The turbine reverses
• C. A warning light is activated
• D. Protective equipment just outside the generating station automatically opens

Answer: (D)

Abnormal rotation triggers automatic protective isolation at the boundary of the plant. Protective equipment located just outside the generating station is designed to open automatically when this condition is detected, quickly disconnecting the generator from the grid. This external, rapid opening stops energy flow and protects both the turbine-generator and the connected network from damage or unsafe conditions. A warning light simply signals an issue but does not remove power. A turbine reversing is a symptom of a fault, not the automatic protective action. While a main breaker trip is a protective action, the described, automatic response located outside the station is specifically the external protection opening to isolate the unit.

Abnormal rotation triggers automatic protective isolation at the boundary of the plant. Protective equipment located just outside the generating station is designed to open automatically when this condition is detected, quickly disconnecting the generator from the grid. This external, rapid opening stops energy flow and protects both the turbine-generator and the connected network from damage or unsafe conditions. A warning light simply signals an issue but does not remove power. A turbine reversing is a symptom of a fault, not the automatic protective action. While a main breaker trip is a protective action, the described, automatic response located outside the station is specifically the external protection opening to isolate the unit.