Governing of turbines is required to control the speed of turbine, since it is coupled with an electric generator with fixed number of poles provided in generator. The speed of turbine is controlled by controlling of water flow. This is done by means of a governor which is running due to motion of shaft of turbine. There is a servomotor in which cylinder and piston are used to control the flow area of water by spear. If the turbine speed increases due to decrease in load in generator, the speed is reduced by decreasing the flow of water by spear movement by piston and cylinder servomotors.
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