Specific cause:
- Fault in the HT Motor
- Supply failure to feeding Bus
- Low Lube Oil Pressure (tripping of pump, low Oil level, Oil leak etc.) / High bearing temperature of motor/Fan bearings due to Lube Oil System Failure.
- High Bearing Vibration
- Process Failure (Cooling Water failure to the motor / Discharge Damper Closed)
Control Room Operator Action:
- Unit Tripped so prepare for Hot Box-up
- Rectify the fault for tripping both ID Fans.
- Check the HT Supply and LT Supply(Station Supply)
- Maintain Drum Level by controlling BFP/CEP
- Initiate purging to Reset MFT
- Go for light-up
Local Operator Action:
- Check the direction of rotation of both the ID fans
- Monitor the bearing and motor Winding Temperature
- Observe the Vibrations in the Machines
Final Correction:
- Prepare for Hot Box-up after rectifying the fault in both ID Fans
