Which two parameters trigger the external overspeed/overtemp assembly to initiate a shutdown?

Which two parameters trigger the external overspeed/overtemp assembly to initiate a shutdown?

• A. Oil pressure and fuel flow.
• B. Ambient temperature and humidity.
• C. Turbine Outlet Temperature and rotational speed.
• D. Generator voltage and current.

Answer: (C)

Protection for an external overspeed/overtemp circuit relies on monitoring heat and speed. It uses Turbine Outlet Temperature and rotational speed as its signals. If the turbine outlet temperature exceeds its safe limit, or the rotational speed (RPM) goes above its allowed maximum, the assembly trips and shuts down the turbine to prevent damage to blades, bearings, and other components. Other factors like oil pressure, fuel flow, ambient conditions, or electrical parameters aren’t the signals this particular protection uses to trigger the shutdown, though they are handled by other protection circuits.

Protection for an external overspeed/overtemp circuit relies on monitoring heat and speed. It uses Turbine Outlet Temperature and rotational speed as its signals. If the turbine outlet temperature exceeds its safe limit, or the rotational speed (RPM) goes above its allowed maximum, the assembly trips and shuts down the turbine to prevent damage to blades, bearings, and other components. Other factors like oil pressure, fuel flow, ambient conditions, or electrical parameters aren’t the signals this particular protection uses to trigger the shutdown, though they are handled by other protection circuits.