Fail-safe system for a reversible pump-turbine apparatus

Details Fail-safe system for a reversible pump-turbine apparatus Fail-safe system for a reversible pump-turbine apparatus

1983-11-21

1986-11-25

Garrett, Robert E.

Rotary kinetic fluid motors or pumps

With control means responsive to non-cyclic condition...

Casing, runner, or shaft position or extent of motion...

415 51, 415500, 91 32, 91410, F01D 1700, F01D 2114, F15B 902

Patent

active

046246223

ABSTRACT:
A fail-safe system is used in a control unit for opening and closing guide vanes of a pump-turbine apparatus operable in both of pump operation mode and turbine operation mode. The fail-safe system has a wire carried by a rotatable sheave adapted for transmitting an information concerning an opening degree of the guide vanes, a weight suspended from one end of the wire, an operation rod disposed below and in alignment with the weight in the direction of action of the force of gravity, and a change-over valve adapted to be switched by the operation rod. When the wire is cut off accidentally, the weight drops onto the operation rod to depress the latter to switch the change-over valve so that a servo-motor is switched to make the guide vanes close at predetermined rates of change of the opening degree in respective operation modes.

REFERENCES:
patent: 3635020 (1972-01-01), Mahlmann
patent: 3802318 (1974-04-01), Sibbald
patent: 3813990 (1974-06-01), Coppola et al.
patent: 4028510 (1977-06-01), Yamaura et al.

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