Bbc Brown, Boveri & Company, Limited

Asea Brown Boveri Inc.

Karel Skala

Heinrich Lageder

Jan Ramisch

In a quick-action flap, in which opening occurs by means of hydraulic actuation and closing can be initiated by a spring, two independent systems are provided, namely a servo system. (1) and a flap disk system (2), which are connected to one another via a coupling (1a, 2a). The coupling itself has, between the coupling part (1a) on the servo side and the coupling part (2a) on the flap disk system side, a free-wheel which makes it possible for the forces occurring upon impact of the flap disk (14) on the seating ring in the flap casing (9) to be divided up in accordance with the kinetic energy of the moving masses of each system (1, 2). The free-wheel thus distributes the stressing over two successive impacts, whereby the stress in the lever (12) of the flap disk (14) is reduced by approximately one half. A hydraulic brake in the servo system (1) ensures that the closing speed of the flap disk is kept constant approximately in the last third of the closing process.

Quick-action flap

Device for determining the power output of a turbo-group during disturbances in the electricity supply network, the working-medium pressures at the beginning and the end of all turbine-sections being utilized, from the time the disturbance breaks out, throughout its duration, and until the signal oscillations die away, in order to generate a signal representing the instantaneous power output of the turbo-group, this signal being employed to implement the regulating function during the disturbance.

Device for determining the power output of a turbo-group during

A steam turbine plant is disclosed having at least one turbine intake valve and at least one by-pass valve, which valves are connected with a live-steam generator by way of a live-steam supply system. A regulating circuit is provided to control the opening or respectively closing motion of the turbine intake valve and/or the by-pass valve, where the regulating circuit is designed in such manner that it will supply each valve with one electrical regulating value (x.sub.1, x.sub.2) which will act upon the respective controlled system. The electrical regulating value is provided so as to attain a specific steam flow-through (Q.sub.1, Q.sub.2), representing the controlled variable. The controlled systems each comprise a valve to be regulated. The controlled systems differ from each other in particular features in that there is placed within the controlled system containing the turbine intake valve and/or the by-pass valve at least one correction element which possesses such transfer function that the transfer functions of both controlled systems will be, at least in approximation, identical with each other.

Steam power plant and control element for the plant

A system for regulating the rate of closing of the turbine intake valve of a steam turbine plant is disclosed. A steam turbine is supplied from a steam generator through a turbine intake valve. A branch line conducts the steam to a bypass valve which is normally closed. In the event of conditions making it necessary to close the turbine intake valve rapidly, a regulator is provided to control the rate of closing of the turbine intake valve and the opening of the bypass valve so that the pressure conditions in the steam generator do not exceed the limits established by the manufacturer. Pressure measuring instruments are placed in the system to sense the pressure immediately upstream from the turbine intake valve and the bypass valve as well as the initial steam supply pressure. These pressure signals are transmitted to a computer which produces a control signal in accordance with predetermined conditions.

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Windisch, Switzerland

Karel Skala