Method of starting a variable-speed pump turbine or a variable s

Details Method of starting a variable-speed pump turbine or a variable s Method of starting a variable-speed pump turbine or a variable s

1985-12-20

1987-11-24

Smith, Leonard E.

Pumps

Processes

417 23, 417 29, 417 42, 417 45, F04B 4900

Patent

active

047085940

ABSTRACT:
A method of starting a variable-speed pump turbine or a variable-speed pump driven by a variable-speed generator motor or a variable-speed motor connected to an electric power line in parallel therewith. The generator motor or the motor is first operated at low speed with the guide vanes or the delivery valve fully closed. The low speed is lower than a stable starting speed of the pump turbine or the motor but high enough to prevent backward flow of water into the pump turbine or the pump. After the operation is set at the low speed, the guide vanes or the delivery valve are opened and the opening degree is gradually opened until the speed is increased to a speed optimum for the steady operating condition of the pump turbine or pump. This method effectively suppresses abrupt increase in the pump input power required for the driving of the pump turbine or the pump, whereby unfavorable effect on the electric power line is avoided advantageously.

REFERENCES:
patent: 3957395 (1976-05-01), Ensign
patent: 4204808 (1980-05-01), Reese et al.
patent: 4586870 (1986-05-01), Hohlweg et al.

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