Pumping up hydroelectric power plant
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorsSachio Tsunoda, Kaneo Sugisita
Life of this patent
Estimating the term…
Abstract
In a pumping up hydroelectric power plant including a main pump/turbine and a booster pump operable in series during the pumping operation of the main pump/turbine, time constants K.sub.1 and K.sub.2 for the pump/turbine and the booster pump, and average torques y.sub.1 and y.sub.2 for the same two machines are selected to satisfy relations (K.sub.1 /K.sub.2)(y.sub.2 /y.sub.1).apprxeq.1.0 and 0.71.ltoreq.K.sub.2 /K.sub.1 .ltoreq.1.42.
Claims4
A method of operating a pumping up hydroelectric power plant comprising a main pump/turbine having a draft tube, and a booster pump provided in said draft tube, so that said booster pump is operated in series with said main pump/turbine during the pumping operation of the pump/turbine, the operation of said main pump/turbine and said booster pump including the step of decelerating said pump/turbine and said booster pump such that the following relations are satisfied:
- (K.sub.1 /K.sub.2) (y.sub.2 /y.sub.1).apprxeq.1.0
- and
- 0.71.ltoreq.K.sub.2 /K.sub.1 .ltoreq.1.42
- wherein
- K.sub.1 :
- time constant of the rotating part of the pump/turbine,
- K.sub.2 :
- time constant of the rotating part of the booster pump,
- y.sub.1 :
- average torque exerted to the rotating part of the pump/turbine,
- y.sub.2 :
- average torque exerted to the rotating part of the booster pump.
A pumping up hydroelectric power plant structure comprising a main pump/turbine having a draft tube, a booster pump provided in said draft tube, so that said booster pump is operated in series with said main pump/turbine during the pumping operation of the pump/turbine, and a power system for operating the main pump/turbine and booster pump, said main pump/turbine and said booster pump being constructed to satisfy relations
- (K.sub.1 /K.sub.2) (y.sub.2 /y.sub.1).apprxeq.1.0
- and
- 0.71.ltoreq.K/K.ltoreq.1.42
- wherein
- K.sub.1 :
- time constant of the rotating part of the pump/turbine
- K.sub.2 :
- time constant of the rotating part of the booster pump,
- y.sub.1 :
- average torque exerted to the rotating part of the pump/turbine,
- y.sub.2 :
- average torque exerted to the rotating part of the booster pump,
- so that when the main pump/turbine and booster pump are simultaneously disconnected from the power system, the rotating speeds of each pump are simultaneously reduced to zero.
Dependencies are inferred from the claim text.