The primary purpose of a governor for a hydroelectric unit is to control the speed and loading of the unit. It accomplishes this by controlling the flow of water through the turbine. To understand how a hydroelectric governor operates, a basic understanding of governor fundamentals is helpful.

Generally governors are used to maintain a fixed speed not readily adjustable by the operator or to maintain a speed selected by means of a throttle control lever. In either case, the governor protects against overspeeding.

How does it works?

If the load is removed on an operating engine, the governor immediately closes the throttle.If the engine load is increased, the throttle will be opened to prevent engine speed form being reduced.

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