Abstract: In a safety door-locking system for a switchgear cabinet, in which the electric operating state inside the switchgear cabinet is operationally connected to a locking device of a cabinet door of the switchgear cabinet, it is provided that a position of a switch in the switchgear cabinet is coupled via a mechanical connecting system (9, 10, 11, 12, 4, 5) to a locking linkage of the cabinet door. For this purpose, a rotatably (14a) mounted control disc (9) is permanently connected to the switch in the switchgear cabinet (1), the control disc (9) additionally representing the position of the switch. The control disc (9) and a locking rod (4) are operationally connected mechanically via a connecting rod (10) and a connecting angle (11) held between guide pins (12a, b) in the locking rod (4), and the locking rod (4) is mounted displaceably (19) for the purpose of locking the locking linkage of the cabinet door.

Abstract: The object of the invention is to provide a method and a device for operating a premix burner which improve the supply of fuel under certain types of operation.According to the invention, this is achieved by the fact that the liquid fuel (2) and the water (27) are conveyed separately to the liquid-fuel nozzle (17), and only there a liquid-fuel/water mixture (28) is produced, which is then injected into the inner chamber (9) of the premix burner (4) in a plain jet (29) with an injection angle a of less than 10.degree.. To this end and, the liquid-fuel nozzle (17), which opens out centrally into the inner chamber (9), is designed with a simple injection opening (19). A mixing zone (22), into which a liquid-fuel line (20) and a water feed line (21) open out, is arranged upstream of the injection opening (19).

Abstract: The gas-insulated, metal-enclosed switchgear assembly contains two, three or more switchpanels, each having a multipole power breaker (CB.sub.1, CB.sub.2, CB.sub.3, CB.sub.4) as well as isolating and grounding switches per switch pole (CB.sub.1R) and is designed like a ring or in a 11/2 power-breaker circuit. The switch poles of the power breakers are each of identical design and are arranged parallel to one another. The switchpanels each have one current path of U-shaped design per phase in a vertical plane, in which current path the base of the U contains a vertically aligned pole of the power breaker, and the two limbs of the U each contain an electrical connection of the power breaker and an isolating as well as a grounding switch. The upper limbs of the U of one of the switchpanels are connected phase-by-phase to the lower limbs (S.sub.u) of another of the switchpanels, by means of respective single-phase gas pipelines (L.sub.12 (R), L.sub.23 (R), L.sub.

Abstract: The encapsulation (1) of a gas-insulated switchgear assembly is supported at both ends (7, 9) on a foundation (11). To this end, mounting device (12) are provided at the first end (7) and are anchored in the foundation (11) such that they cannot move. At the second end (9), the mounting device (13) are designed such that they can move with respect to the foundation (11), in the longitudinal direction of the encapsulation (1). This avoids mechanical stresses in the assembly. A force absorbing member is also provided at the first end (7), which transmits horizontal forces from the encapsulation (1) to the foundation (11), and thus relieves the load on the mounting device (12, 13).

Abstract: The invention is directed to a method of operating a burner. The method includes feeding an auxiliary gas into a liquid fuel upstream of an injection orifice during the ignition and during part load of the burner, and interrupting the feeding of the auxiliary gases within high load ranges of the burner.

Abstract: In the case of a method for feeding reactive power into an AC grid system, in the case of which method at least one line (10) of the grid system has a compensation voltage (U.sub.comp) produced for it, which compensation voltage (U.sub.comp) is phase-shifted with respect to the current in the line (10) and is injected into the line (10), simplified compensation is achieved in that the compensation voltage (U.sub.comp) is produced from a DC voltage by means of an inverter (11), which is formed by gate turn-off power semiconductors in a bridge circuit, and in that the compensation voltage (U.sub.comp) is injected in series directly into the line (10).

Abstract: A method of manufacturing a gear wheel including a shaft and a tooth system. The method includes the steps of hardening and annealing the gear wheel, heating the gear wheel to an annealing temperature, spinning the gear wheel when the annealing temperature is reached, spinning the gear wheel while cooling the gear wheel and grinding the gear wheel to a final size. The method allows the manufacture of gear wheels having an increased service life.

Abstract: In a friction- and form-grip connection of rotating components (1, 2) which have different expansion behavior in the region of the connection during rotation, the form grip is effected via a stepped centering seat (3). The friction grip between the two components is effected by way of axially prestressed elements. At least one of the components has a cavity (6) in the interior, in which cavity (6) an insert ring (7), which exerts a radial force on the centering seat (3) during operation, is arranged. The prestressed insert ring (7) bears with only part of its axial extent against the component (1) interacting with it.

Abstract: In a generator which is operated according to the induced-draft-cooling principle and in which a main fan (11), attached to the rotor shaft (12) of the generator, draws cooling medium, which is heated by the heat-generating elements of the generator, out of the generator and transports it essentially perpendicularly to the axis of this rotor shaft (12) to a cooling arrangement (23), the drawn-in cooling medium, which is expelled with a swirl at high velocity by the main fan (11), being received by a cooling-duct casing (33), which directs the cooling medium to the cooling arrangement (23) via at least one fluidic constriction (41), the directing of the cooling medium, while efficiently avoiding vortices and pressure drops, is achieved in that the cooling-duct casing (33) has at least one overflow duct (66), which receives the cooling medium, expelled into the cooling-duct casing (33) by the main fan (11), via an inflow zone (58) upstream of the constriction (41), diverts the cooling medium around the constric

Abstract: In the case of an electrical machine which has in its laminated stator core (10) slots which comprise winding slots (1) and preliminary slots (2), the winding bars (3, 4) which are embedded in the winding slot (1) are fixed by means of a slot sealing arrangement (8), which slot sealing arrangement (8) also has a double function of sealing the preliminary slot (2) from an air gap (12) of the machine. The slot sealing arrangement (8), which is formed essentially from an upper wedge (5), a lower wedge (6) and a wedge attachment (7), forms, together with the slot walls (13a, 13b) which bound the preliminary slot (2), flow channels (2a) for a gaseous cooling medium for cooling the teeth (15) of the laminated stator core (10).

Abstract: A method for controlling a power plant which delivers electrical power to an electrical grid. The grid has a grid frequency which fluctuates around a nominal frequency. A power output of the power plant is controlled as a function of a control frequency, in such a manner that the power output is increased when the control frequency decreases below the nominal frequency. On the other hand the power output is decreased when the control frequency rises above the nominal frequency. The grid frequency is continuously measured. The measured grid frequency is averaged to give, as a moving average, a slowly varying averaged trend frequency which is characteristic of the long term behavior of the grid frequency. The averaged grid frequency is used as the control frequency, if the measured grid frequency lies within a predetermined band around the averaged grid frequency. The measured grid frequency is used as the control frequency, if the measured grid frequency lies outside the predetermined band.

Abstract: In a combined cycle power plant with a gas turbine circuit and a steam turbine circuit, the exhaust gases from a gas turbine (4) transfer their residual heat to a steam turbine (9, 10) via the working medium flowing in a once through steam generator (7). The deaeration of the working medium is carried out in the hot well (12) of the steam turbine condenser (11), the deaerated working medium is introduced directly from the hot well of the condenser via a feed pump (14, 20) into the preheating surfaces (15, 21) of the once through steam generator, and a separating bottle (25) for the blowdown of impurities is arranged between the evaporation surfaces (16, 22) and the superheating surfaces (19, 23).

Abstract: In a gate turn-off thyristor (GTO) with homogeneous anode, emitter and stop layer, a device which short-circuit the stop layer with the anode is provided in an edge termination region. As a result, in a reverse-biased state, the GTO has a structure of a diode in the edge region and amplification of a reverse current is obviated. With this structure, thermal loading in the edge region is reduced, as the GTO tolerates a higher operating temperature at a predetermined voltage.

Abstract: A gas-insulated power breaker (1) has encapsulation (2) which is filled with an inert gas. Live parts (10, 11, 12, 13) are arranged in the encapsulation (2). In order to prevent damage to the live parts (10, 11, 12, 13) during transportation, a transport support (17) is provided. In a secured position, the transport support (17) supports the live parts (10, 11, 12, 13) with respect to the encapsulation (2). It can be partially withdrawn and moved to an operating position, through a gastight aperture (22), without the inert gas having to be evacuated or the encapsulation (2) opened in this event. This allows the switch to be transported safely, prevents contamination of the interior (3) of the encapsulation (2), and avoids the need for costly emptying and refilling with inert gas.

Abstract: A joint between a first and a second joint partner where each joint partner has at least one flat, cylindrical surface section via which force is applied to the other joint partner. The joint partners being brought into contact with one another in a sliding fashion such that the flat, cylindrical surface sections of the joint partners partially overlap and form a common bearing surface in the contact region. The flat, cylindrical surface sections of the joint partners are each bonded on one side by an undercut and the joint partners are joined such that the common bearing surface of the joint partners is bounded in one direction by the undercut of the first joint partner and in the opposite direction by the undercut of the second joint partner. This arrangement allows zones of maximum stress gradient to be shifted into the region of the undercut structures and for crack-opening, surface-parallel stresses to be substantially avoided.

Abstract: A method and an arrangement for preheating the fuel for a firing plant which is operated with liquid or gaseous fuel, which is fed to the firing plant via a feed line, having at least one heat-exchanger unit which is thermally coupled to the feed line and through which heat is transferred from a heating medium, which is directed in a heating circuit, to the fuel.The invention is distinguished by the fact that the pressure at which the fuel is directed in the feed line is greater than the pressure at which the heating medium is directed in the heating circuit, at least in the region of the heat exchanger.

Abstract: In a device for sealing the gap between the moving blades and the stator, designed with a conical contour, of a turbomachine, the moving blades are provided at the blade end with encircling shroud plates. These shroud plates project into a cavity in the stator and, while forming radial gaps, make a seal against the stator, which is provided with sealing strips. The cavity at the labyrinth inlet is subdivided in its radial extent into at least two axially staggered cavities. The shroud plate is of stepped design with at least two choke points with respect to the stator, the sealing strips acting on one step each while enclosing a vortex chamber. A curved sealing strip which runs at least approximately horizontally preferably acts on each step of the shroud plate.

Abstract: In the switched-on position, under the influence of contact forces generated by elastic deflection or else by mechanical spreading, or spreading caused by the attraction of parallel currents or repulsion of antiparallel currents, of a switching pin (5) , the switching pins presses against the inner side of a first switching ring (4), which is rigid for the purpose of avoiding mechanical overloading and securing sufficient consumable reserves. By way of example, a support (30) of the switching pin (5) is adjoined by two parallel, elastic extensions (52a, 52b), which are separated by a slot (53) and respectively support a contact member (54a; 54b) by means of a connecting element (55a; 55b) forming half a screw thread, with the result that said contact member is in each case offset by 180.degree. relative to the extension (52a; 52b).

Abstract: A premix burner for a gas turbine engine having a pair of partial conical bodies stacked inside each other to form a conical interior chamber is disclosed. The conical bodies are offset laterally to form tangential air flow openings. The width of the openings is varied in a prescribed manner to induce rotational disorder.

Abstract: A wreath of contact fingers (4) directed radially toward a switching axis (1) presses in the closed position against the circumferential surface of a contact pin (2) with consumable heads (5) fitted on the ends. At an angle of approximately 90.degree., the contact fingers (4) adjoin webs (6) which are guided in the closing direction up to a housing part (7) at which they are permanently anchored and via which they connect the contact fingers (4) to an electric terminal. The webs (6) and--with the exception of the consumable heads (5)--the contact fingers (4) are produced in one piece from springy material of high conductivity. The contact with the contact pin (2) radially deflects the consumable heads (5) in the closing direction with elastic bending of the webs (6). The length (R) of the radial contact fingers and the length (L) of the axial webs (6) are selected such that the attraction of the parallel component currents through the latter approximately compensates the contact repulsion forces.