Hydro-generator spinning

[wbd]

Hello,
I would like to know if there are any detrimental effects of the following scenario:
A 3 MW hydroturbine is left spinning at around 200-250 rpm (synch speed is 360 rpm)due to the inability at this time to bring it to a complete stop (spun wicket gates, possibility of ice blockages in vents and penstock). Breaker is open and field is off.
Thank you in advance.

 

[DougMSOE]

As lond as there is proper bearing lubrication you should be fine.

 

[Nandos]

The bearings will last less.

You did not say the the hydro was loaded or not.

Make sure that the oiling is properly working.

What type of turbine you have a Banki ?.

Regards
Nando