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US 4,363,597 AGranted
Method for operating pumps
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorsSachio Tsunoda, Katsunori Shirasu
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AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorsSachio Tsunoda, Katsunori Shirasu
Estimating the term…
A method for operating pumps in a pumping-up power plant having a single speed reversible pump turbine and a booster pump, the booster pump being provided in a branch pipe which is provided in parallel with a portion of a draft tunnel between the pump turbine and a lower reservoir, is disclosed. The method for operating the pumps comprises the steps of, closing an inlet valve at the discharge side of the pump turbine, closing a portion of the draft tunnel which is in parallel with the branch pipe, opening the branch pipe, starting the pump turbine in air as a pump, starting exhaustion of the air remaining inside the pump turbine when the rotation speed thereof reaches a predetermined value, starting the booster pump after the exhaustion is started, and opening the inlet valve at the discharge side of the pump turbine after the rotation speed of the booster pump reaches a predetermined value.
A method for operating pumps in a pumping-up power plant having a single speed reversible pump turbine and a booster pump, said booster pump being provided in a branch pipe which is in parallel with a portion of a draft tunnel between said pump turbine and a lower reservoir;
Dependencies are inferred from the claim text.