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I am having difficulty explaining to my mechanical engineering supervisors the following:

When a pumped storage unit is in generation mode, synchronised to the grid and in steady state and the guide vanes/wicket gates are opened more to allow more water flow and therefore more power generation, the pressure across the Francis turbine initially decreases before increasing. The pressure is related to the power so therefore there is a power dip first then a increase in power.

Similarly, when the guide vanes are closed to decrease power, the power/pressure first increases before decreasing after a few seconds.

The transfer function of a hydraulic turbine shows this phenomenon with the use of initial value theorem and final value theorem.

Can you help to explain why this happens?

Thanks

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# Hydraulic turbine transient performance

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