What are the symptoms when a turbine is overspeeding?
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There are many signs that a turbine is overspeeding.: Such as the sound is abnormal, the speed indication continues to rise, the speed control oil pressure rises, the vibration increases, the load reaches zero (when the generator is suddenly disconnected from the power grid), etc.
Abnormal sound, changes in unit process fluid flow, sharp increase in speed indication, chain alarms, etc.
Turbine overspeed: 1 Turbine generator overspeed: Abnormal sound, increased speed, and no load on the generator ； Lubricating oil pressure and safety oil pressure of generator with shaft head pump increase ； The vibration value of the unit increased rapidly. 2 Industrial steam turbine overspeed: The sound is abnormal, the unit speed continues to rise beyond the rated speed, the process gas pressure and flow rate rise simultaneously, and the steam inlet flow rate rises ； The vibration value of the unit increased rapidly.
It may be in these aspects: increase in vibration ； If the load decreases but the speed does not decrease, the unit will overspeed. ； Oil temperature rises ；
I have never seen a running steam turbine overspeeding. If the overspeeding is too serious, it will cause a chain trip.