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Steam turbines run with a speed governor which responds to changes in turbine rotational speed and operates on the steam admission valves. Thus if the network that the turbine generator feeds has a change in frequency, the turbine responds. If extra load comes onto the network, the frequency drops slightly, the generator slows and the turbine must follow (they are solidly locked together) so that the governor then opens the steam valves to try to keep the speed steady. The converse happens if the network suddenly loses load.

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