Turbine overspeed protection

Details Turbine overspeed protection Turbine overspeed protection

2007-03-27

2007-03-27

Casaregola, L. J. (Department: 3746)

Power plants

Combustion products used as motive fluid

Process

C060S039281, C415S001000, C415S043000

Reexamination Certificate

active

10930495

ABSTRACT:
A method and apparatus for turbine overspeed protection, useful for steam and gas turbines, is disclosed. The apparatus comprises a spring-loaded rod held by a plurality of energized solenoids in an operating position any time the turbine's shaft rotational speed is less than a trip rotational speed set-point. When the rotational speed reaches the trip rotational speed set-point, both solenoids are de-energized and the spring-loaded rod moves to provide turbine trip. Increased reliability of the solenoids is provided by compressing the spring during the resetting of the rod with an additional electromechanical actuator and by using a plurality of solenoids, each of which is able to provide the force required to hold the spring in its compressed state.

REFERENCES:
patent: 1961813 (1934-06-01), Caughey
patent: 2386110 (1945-10-01), Hagemann
patent: 2595007 (1952-04-01), Sheppard
patent: 2926680 (1960-03-01), Eggenberger
patent: 3614457 (1971-10-01), Eggenberger
patent: 3685791 (1972-08-01), Czuszak
patent: 4208032 (1980-06-01), Mineur

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