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Other Methods for Eliminating Oil at Hydro Facilities
In addition to the various methods mentioned to eliminate oil use in Kaplan turbines, Toshiba Corp. presents other solutions for reducing or eliminating oil in hydro plants. These include:
— Pelton unit nozzle control. Because of the relatively slow movement of the needle, it is fairly easy to convert to an electric servomotor to control operation of Pelton turbine nozzles.
— Pelton nozzle deflector control. This conversion is more challenging because these deflectors must be capable of deploying in a short amount of time for emergency shutdowns. Installing a large-capacity electric servomotor or a large spring-equipped servomotor allows for elimination of oil lubrication while still providing quick control.
— Wicket gate operation. Electronic controls can be used to replace traditional oil-based wicket gate operating mechanisms. This conversion will not completely eliminate oil use, as the reducing gear will still be oil-lubricated. This requires a small amount of oil, kept under atmospheric pressure, as opposed to a large volume of pressurized oil.
— Transformer insulation. An alternative to oil use is gas-insulated transformers, which are filled with nonflammable SF6 gas. These transformers are compact and easy to install and maintain.
Thanks to HydroWorld
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