When will the IDG be automatically disconnected?

When will the IDG be automatically disconnected?

• A. High oil temp or over torque
• B. Low oil pressure or high vibration
• C. Overcurrent or short circuit
• D. Low oil temp or under torque

Answer: (A)

IDG auto-disconnect is a protective action tied to the engine-driven gearbox’s condition and load. It disconnects the generator when the gearbox oil temperature gets too high or the torque transmitted to the gearbox is excessive. Both situations indicate potential damage from overheating or mechanical overload, so opening the disconnect stops the generator from being driven and protects the geartrain and generator. Other indicators like low oil pressure or high vibration point to problems but aren’t the official triggers for automatic disconnection in this setup, and electrical faults such as overcurrent or a short circuit are handled by electrical protection rather than the IDG’s mechanical disconnect.

IDG auto-disconnect is a protective action tied to the engine-driven gearbox’s condition and load. It disconnects the generator when the gearbox oil temperature gets too high or the torque transmitted to the gearbox is excessive. Both situations indicate potential damage from overheating or mechanical overload, so opening the disconnect stops the generator from being driven and protects the geartrain and generator. Other indicators like low oil pressure or high vibration point to problems but aren’t the official triggers for automatic disconnection in this setup, and electrical faults such as overcurrent or a short circuit are handled by electrical protection rather than the IDG’s mechanical disconnect.