Abstract: An electrical machine (10), in particular a generator, comprises a rotor (12) with pole zones, in which pole zones amortisseur bars (15) designed as wedges are arranged, which amortisseur bars (15), on the outside of the rotor (12), are pushed into slots (14) provided for this purpose and running in the longitudinal direction and are held in the slots (14) by supporting means (28) against the centrifugal forces occurring during rapid rotation of the rotor (12) and which are connected to one another in an electrically conductive manner at the ends of the rotor (12) by an amortisseur ring (18) or amortisseur segments (17), which enclose the rotor (12) in an annular or ring-section-shaped manner.

Abstract: In a method for stabilizing a power supply network against fluctuations of the reactive power of an electrical system, in particular of an arc furnace (5), having at least one transformer (3), the at least one transformer (3) is switched on and off on the supply network side in switching sequences which result in a fundamental-frequency power factor with a value at least approximately equal to 1. The fundamental-frequency reactive power is thus at least approximately equal to zero.

Abstract: An iron aluminide coating as a bonding layer between a thermally stressed element of a thermal turbomachine and a heat insulation coat consists essentially of:  5-35 % by weight aluminum 15-25 % by weight chromium 0.5-10  % by weight molybdenum, tungsten, tantalum and/or niobium   0-0.3 % by weight zirconium 0-1 % by weight boron 0-1 % by weight yttrium the remainder being iron and incidental impurities arising from production thereof.

Abstract: Described is a turbine blade with a metal blade body and a protective coating constructed of a porous intermetallic felt, and in the blade body of the turbine blade cooling air channels are constructed that end at the intermetallic felt in order to supply it with cooling air. The intermetallic felt is based on an iron or nickel aluminide alloy with mixing ratios of Fe:Al or Ni:Al of approximately 50:50, and that the protective coating has cooling channels that are facing the blade body and end in the area of the cooling channels. The design of the turbine blades permits their cooling with a smaller amount of cooling air, and, due to improved aerodynamics and a lower cooling air supply, the degree of effectiveness of the turbine is significantly increased.

Abstract: The sheet-metal casing comprises at least two sheet-metal parts (1, 2) and has a plastic seal (9) arranged in between. A first sheet-metal part (1) is folded over along the seal (9) to form a fold (10) and comes into contact with the second part (2) in such a way that, in addition to the fold (10), a gap (13) for accommodating the seal (9) forms. The fold (10) ensures good electrical contact between the two parts (1, 2) and thus good screening. At the same time, it defines the width of the gap (13), so that the seal (9) is subjected to defined compression.

Abstract: A power station (10) includes a generator (13) which is driven by a turbine (11). The power station produces electrical power and outputs the electrical power to a network (17) via a generator switch (14). An electrical standby load (18) is also provided. When a network fault occurs, the generator is disconnected from the network by the generator switch and connected to the electrical standby load. The electrical standby load emulates the real load of the network that was present prior to the network fault, so that the voltage of the generator is stabilized at a constant phase difference or phase angle with respect to the voltage of the network that was present prior to the network fault. Alternatively, the value of the electrical standby load is adjusted during isolation of the generator from the network, to track the network while the generator is disconnected from the network and match the voltage phase angle of the generator to the network.

Abstract: In a generator with a cooling system which draws in, from the generator, cooling medium heated by the heat-generating elements of the generator and which guides the hot cooling medium to at least two cooling units (23), which cooling units (23) operate in parallel and cool the cooling medium before it is led back to the heat-generating elements of the generator, operation substantially uninfluenced by failures of the cooling units (23) is made possible by means being provided which mix together the cooling medium flows (31) flowing from the different cooling units (23) after they emerge from the cooling units (23) and before they are supplied to the heat-generating elements of the generator.

Abstract: The object of the invention is to create a centrifugal compressor with a cooling appliance which is simpler but more effective. This is achieved by the feed device (27) for the gaseous cooling medium (31) opening into the separating gap upstream of the mainly radially extending gap region (20) of the separating gap (18).

Abstract: A condensation system for the condensation of turbine exhaust steam has a condenser installation (25) in which a surface condenser (30) and a direct-contact condenser (35) work in combination. In this case, the two condensers (30, 35) are either arranged in a single common housing or are each arranged in a separate housing. In one embodiment, the condenser installation (25) is connected in a circulation circuit for the cooling media to a wet-dry cooling tower or hybrid cooling tower (40). In this case, the cooling water of the surface condenser (30) is recooled in the wet part (42) and the cooling condensate of the direct-contact condenser (35) is recooled in the dry part (41) of the hybrid cooling tower (40).

Abstract: The section of an electrical high-voltage system has a gas-filled housing of predominantly symmetrical design. Provided in the housing are a conductor extending along a plane of symmetry of the housing, and cooling means for producing a circulation flow which dissipates heat loss from the conductor. The cooling means contains two blowers. The blowers are arranged in the interior of the housing and designed in such a way that, during the operation of the system, two mirror-symmetrical circulation part flows are formed which are bounded by the plane of symmetry. These circulation part flows are in each case guided without recirculation along a housing side wall from the top of the housing or the bottom of the housing. By this means, the heat loss is given up particularly effectively to the housing side walls, and the conductor can be loaded with very high operating currents.

Abstract: A rotary atomizing head type coating machine which is arranged to prevent occurrence of spark discharges, including a rotational shaft (9) which is formed of an insulating material, a rotary atomizing head (11) which is likewise formed of an insulating material and mounted on a fore end portion of the rotational shaft (9). An on-head semi-conductive coat film (14) is formed on outer peripheral surfaces of the rotary atomizing head (11). On the other hand, a first arcuate coat film (16) is formed on a first limiter ring (15) which is provided on a motor body (6), and a second arcuate coat film (18) is formed on a second limiter ring (17) which is provided on the rotary atomizing head (11). Further, a power supply semi-conductive coat film (19) is formed on and around outer peripheral surfaces of the rotational shaft (9) between the arcuate coat films (16) and (18).

Abstract: The invention specifies a disconnector for decoupling a load from a supplying AC power supply system. The disconnector comprises a transformer whose primary is connected into the AC power supply system. On the secondary side, a rectifier circuit is provided which has a turn-off thyristor connected to it. In normal operation, the turn-off thyristor is kept closed, so that the power supply system supplies the load. In the event of power supply system faults or interruptions, the turn-off thyristor is opened, which disconnects the power supply system from the load owing to the transformer impedance.

Abstract: An automatically resetting safety valve for a generator circuit breaker is to open rapidly and wide, even if the pressure applied to a valve-closing body (1) does not increase substantially over a valve stroke (a) or even falls. In order to ensure this, a valve-closing-body joint (10) of the valve-closing body (1) via a first closing-body lever (H1) and via a first sliding joint (3), is connected in an articulated manner to a first support lever (H2), which is rotatably mounted in a first support lever joint (4) fastened to a lever wall (5). The first sliding joint (3), via a first compression spring (8), is in compressive connection with a spring wall joint (7) fastened to a spring wall (6). The valve-closing body (1) is movable along a plain-bearing axis (A). First and second closing-body levers (H1, H1′) and first and second support levers (H2, H2′), which are arranged in mirror image relative to the plain-bearing axis (A) of the valve-closing body (1), may be provided.

Abstract: A contact pin is operationally connected through racks and pinions to a movable mating contact arrangement in such a way that it executes a movement counter thereto. Through two spokes through which the racks are guided, it bears a contact ring which surrounds it coaxially at a distance and preferably has a radius which is four to eight times as large. In a groove on its outer side, the contact ring bears a circumferential spiral contact which forms with the inner side of a contact tube, which finishes in a fixed nominal-current contact, a sliding contact arrangement having good current transfer in conjunction with a short length.

Abstract: A drum-type heat-recovery boiler (2) forms, together with the feedwater tank/deaerator (6) and condenser/hot well (4), the steam system of a combined-cycle power station. This steam system has a plurality of containers (10, 16, 22, 6, 4) working at different pressure stages. Some of the containers are formed by steam drums (10, 16, 22). The container of the lowest pressure stage is the condenser/hot well (4). The high-pressure steam drum (10) is connected directly to the intermediate-pressure steam drum (16) via a water line (25) and a steam line (39). The intermediate-pressure steam drum (16) is connected directly to the low-pressure steam drum (22) via a water line (27) and a steam line (41), and the low-pressure steam drum (22) is connected directly to the feedwater tank/deaerator (6) via a water line (29) and a steam line (43).

Abstract: The invention relates to a ceramic lining for combustion chambers (8) consisting of several juxtaposed elements (1) that are attached by means of a retention bolt (3) to the inside of a thermally highly stressed metallic support wall (4), whereby at least one insulation body (5) is arranged between the metallic support wall (4) and the ceramic elements (1). It is characterized in that the ceramic elements (1) essentially have the shape of a straight, regular pyramid whose base (2) has n corners, preferably three corners, and faces the combustion chamber (8), and into whose tip the retention bolt (3) is integrated.

Abstract: Turbomachine, in particular a compressor of a gas turbine, having rotor blades (11) and guide vanes (12), in which individual or all guide vanes (12) are configured as cooled vanes. The cooled vanes (12) have air guidance ducts (13) which emerge into outlet openings (14) in the region of the vane tips (15). Cooling air (K) is ejected through the outlet openings (14) and impinges at high velocity onto a rotor shaft (18). The cooling effect which can be achieved by this means is optimal and, in addition, leads to a raising of the compressor efficiency and the surge line.

Abstract: A method and a device for the isothermal compression of a compressible medium preferably air, for the operation of a turbomachine which is intended to generate energy and in which a pressurized liquid, preferably water, is atomized by means of an atomization device and, together with the air, forms a liquid-air mixture which, in order to be compressed, is introduced into a nozzle arrangement in which most of the kinetic energy of the liquid-air mixture is converted into compression energy as a result of an increase in the pressure of the air. The liquid-air mixture is introduced into the nozzle arrangement at a velocity which is greater than the speed of sound, and the atomization is carried out in such a manner that liquid droplets are formed within the liquid-air mixture, the diameters of which droplets are approximately 200 &mgr;m or less.

Abstract: In a method of operating a power station plant which essentially comprises a gas-turbine group and a steam circuit arranged downstream, a portion of the condensate collecting from this steam circuit is directed to an intercooler, which belongs to the compressor of the gas-turbine group and in which the condensate is heated up to form hot water. This hot water is then introduced directly or via a further heating-up means into the gas-turbine group at a suitable point.

Abstract: In a method for regulating the power of a turbo set (10) converting thermal power into electric power, said turbo set (10) comprising, on a common shaft (17), a turbine (11) driven by the thermal power and a generator (16) driven by the turbine (11) and delivering electric power (PG) to a network (18), the electric power (PG) delivered by the generator (16) is determined and the thermal power (PT) for the turbine (11) is regulated as a function of the measured electric power (PG). Destabilization of the network and overloading of the turbo set (10) are avoided by additionally determining the kinetic power (Pkin) consumed or delivered by the shaft (17) and by regulating the thermal power (PT) in accordance with the sum of the electric power (PG) and kinetic power (Pkin).