OVERSPEED TRIP DEVICES USE

Brand	Owner	Address	Description
PROTECH	WOODWARD, INC.	1081 Woodward Way Fort Collins CO 80524	overspeed trip devices for use on turbines and turbomachinery, consisting of speed sensing circuits interfaced to three individual magnetic pick-ups that send signals through voter relay logic which will cause a turbine trip if two or three speed sensing circuits sense overspeed conditions;In the statement, Column 1, lines 1 and 2, ILLI-NOIS should be deleted, and, DELAWARE should be inserted.;
	Where the owner name is not linked, that owner no longer owns the brand

Technical Examples

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.