Abstract: According to the invention, turbine blades are provided that have increased functional reliability, which is achieved in that the interior space (8) of the blade body (3) in the region of the suction-side wall (4), the pressure-side wall (5) and the trailing blade edge (7) has a closed steam-cooling system (9) having at least one cooling passage (10, 27, 28). An open cooling system (11) having at least one cooling passage (14, 15) and a plurality of film-cooling holes (22) which pass through the blade body (3) is formed in the region of the leading blade edge (6).

Abstract: The electrical apparatus, which is designed in particular as a surge arrestor (3), has a dielectric housing (8) which can be loaded with high voltage as well as an apparatus for optical indication of a fault state caused by a fault current. The indicating apparatus is designed as an information carrier (9) which covers at least a portion of the outer surface of the dielectric housing (8). This information carrier (9) emits an optically detectable signal when heated to a limiting temperature which is above a permissible operating temperature of the apparatus. The information carrier (9) is advantageously designed as a thermocolor. A faulty apparatus can then be identified by the maintenance personnel for a system containing the electrical apparatus, in a simple and reliable manner by means of a color change.

Abstract: The object of the invention is to provide a simple and cost-effective solution for reducing the wear and consequently for increasing the life of axial sliding bearings. For this purpose, the profiled annular surface (24, 24') of the lubricating gap (25, 25') arranged between the fixed bearing body (20) and the rotating bearing collar (19) is designed to rotate about or with the shaft (14). Said annular surface has a plurality of radially arranged lubricating oil grooves (26, 26') and, in each case, a wedge surface (27, 27') connected to these in the circumferential direction. A catch surface (28, 28') is designed between each wedge surface (27, 27') and the lubricating oil groove (26, 26') adjacent to the latter. The lubricating oil grooves (26, 26') and the wedge surfaces (27, 27') are delimited radially outward by a sealing web (29, 29').

Abstract: A pipeline system (10) for the controlled distribution of a flowing medium comprises a main line (11) which branches at a branching point (12) into a plurality of branch lines (13,14,15), in each of the branch lines a variable restrictor (V1,V2,V3), by means of which the mass flow in each of the branch lines (13,14,15) can be adjusted and, belonging to each restrictor (V1,V2,V3), a first pressure measuring device (PM1,PM2,PM3), by means of which the pressure drop of flowing medium at the respective restrictor (V1,V2,V3) is measured. Redundancy in measurement, at a limited additional outlay, is obtained in that at least between two of the branch lines (13,14, or 13,15 or 14,15) a second pressure measuring device (PM10 or PM11 or PM12) for measuring the differential pressure between the respective branch lines (13,14 or 13,15 or 14,15) is arranged downstream of the restrictors (V1,V2 or V1,V3 or V2,V3) in the direction of flow.

Abstract: In a combined power station installation with a gas turbine (4) and a steam turbine (9-11), the exhaust gases from the gas turbine give up their residual heat to the steam turbine via the working medium flowing in a waste heat boiler (7). The waste heat boiler consists essentially of an economizer (21), an evaporator (22) and a superheater (23). A cooling air cooler (32, 33) designed as a once-through steam generator is connected on the water side to the economizer (21) of the waste heat boiler (7). The waste heat boiler is a once-through steam generator in which a separation bottle (25) is arranged on the steam side between the evaporator (22) and the superheater (23). The cooling air cooler (32, 33) is connected on the steam side to the separation bottle (25).

Abstract: A brush gasket for two co-operating components located opposite one another. The brush gasket has a carrier body for the brushes arranged on one of the two components to be sealed off relative to one another, for example, a stator and a rotor. The carrier body has a supporting wall for the brushes on the low-pressure side, in order to protect them against pressure-related deformation. On the second of the components, opposite the carrier body, there is an abrasion ring made of a material which is softer than the material of the brushes. The abrasion ring together with the brushes thus forms a gasket group.

Abstract: The object of the invention is to provide a safe and reproducible compressor impeller fastening for high speed turboengines, which, moreover, possesses more accurate concentricity.This is achieved, according to the invention, in that both the hub cone (9) and the shaft cone (11) each have a mean diameter (23, 24) and these mean diameters (23, 24) are arranged at an axial distance (25) from the mass center of gravity (14) of the compressor impeller (4), said distance corresponding at least to half the mean diameters (23, 24). On the shaft side of the hub cone (9), the through bore (8) of the hub (6) is designed at least partially as a cylindrical bore (16).

Abstract: A method for operating a power electronic circuit having a first power convertor and at least one second power convertor is specified. The pulse duration-modulated driving of the switches of the circuit arrangement is effected according to a comparison of a reference oscillation with a carrier oscillation. According to the invention, a component of a third harmonic is admixed with the reference oscillation over virtually the entire drive-level range, in particular including low drive-level rates in the range from 20% to approximately 87%. It is also possible to admix a corresponding component of a ninth harmonic in the drive-level range from 20% to approximately 33%. This results in a low clock frequency for the first power convertor and the second power convertor need not have a feedback capability. (FIG.

Abstract: A converter is specified which is distinguished in that a bus system is provided between the paths of a phase module of the converter and allows potential chambers to be formed around the semiconductor switches and/or the circuitry elements. The potential chambers surround the semiconductor switches and the circuitry elements. They comprise two longitudinal metal sheets which are arranged to be insulated from one another, in particular overlapping. In addition, transverse metal sheets may be provided, which are connected to the connections of the semiconductor switches and/or circuitry elements. The potential chambers result in each potential chamber having a potential difference which is only a fraction of the intermediate circuit voltage. The bus system carries out the insulation of the high potential difference corresponding to the intermediate circuit voltage.

Abstract: The line section of a gas-insulated line contains a high-voltage electric conductor and a pressure pipe which is made from a thermoplastic material and filled with insulating gas. The pressure pipe holds the electric conductor on insulated supports. The pressure pipe has two pipes which are welded to one another on the end faces thereof, the end section being respectively widened to flare outwardly in the radial direction with the welding of the two pipes.

Abstract: An inverter having a plurality of inverter bridges which operate in parallel and whose output voltage is summed by way of a transformer. The transformer has a number of primary windings and associated secondary windings which correspond to the number of inverter bridges. Each inverter bridge is connected on the output side to a primary winding. The secondary windings are connected in series to sum the output voltages. The transformer has a center tap which is grounded by a ground connection. The suppression of in-phase or common-mode interference currents flowing by the ground connection and the interference voltages associated therewith is achieved by dividing the secondary windings into a first and second identical partial secondary winding. The partial secondary windings are connected to one another in the center tap in such a way that the common-mode currents and voltages induced in the partial secondary windings mutually cancel.

Abstract: An invertor (15) includes a plurality of invertor bridges (B1, . . . ,B8), which are connected in parallel and whose output voltages are summed via a transformer (19). The transformer (19) has a number of primary windings (P1, . . . ,P8) and associated secondary windings (S1, . . . ,S8) which corresponds to the number of invertor bridges (B1, . . . ,B8). Each invertor bridge (B1, . . . ,B8) is connected on the output side to one of the primary windings (P1, . . . ,P8), and the secondary windings (S1, . . . ,S8) are connected in series to sum the output voltages. The transformer (19) has a center tap (23) which is grounded via a ground connection (24). Tertiary windings (T1, . . . ,T8) are assigned to the primary windings (P1, . . . ,P8) and to the secondary windings (S1, . . . ,S8). The tertiary windings (T1, . . . ,T8) are also connected to a common-mode filter (51).

Abstract: A voltage converter having a voltage intermediate circuit and an invertor connected to the output of the voltage intermediate circuit. The invertor produces a three-phase AC voltage at its output and is connected to the output terminals of the voltage converter by a filter arrangement. The filter arrangement includes a filter inductor connected in series with the output terminal and the filter capacitor connected between the output terminal and a common capacitor star point. Attenuation of the DC system is achieved by having the capacitor star point connected to the voltage intermediate circuit by way of an RC element having a capacitor and a resistor.

Abstract: In a turbo engine's welded rotor includes a number of disks, the radially or quasi-radially extending welding seams are intermediately interrupted by annular cavities through which a cooling medium flows, and these cavities are surrounded by a circumferentially extending insert ring. This insures the flow of the cooling medium through the entire rotor without reducing the strength of the welding bond.

Abstract: In a hydraulic method, tubes (3) of an heat exchanger are rolled in in tube plates (1), and rounded tube inlet pieces are formed from the same tube (3) by means of the same device in the same work operation. For this purpose, the tubes (3) are inserted into the bores (2) of a tube plate (1) and cut off with an excess length. The tube (3) is widened by means of a widening machine over the entire depth of the bore (2), so that the tube (3) adheres to the inner wall of the bore (2). At the same time, the projecting tube end (10) is pressed on the mandrel (4) of the widening machine in the direction of the tube plate (1) by means of a further hydraulic shaping device (11) with a swept-back shape (12) until the tube end (10) achieves a trumpet shape. The advantage of the method resides in shortening the operating time with a device which executes both widening and formation of the tube inlet piece hydraulically.

Abstract: A gas-turbine blade of solid construction and having cooling passages is specified, which cooling passages run in its interior and through which the cooling medium flows essentially from the blade root through the gas-turbine blade (100), these cooling passages (20) having a relatively small cross section in relation to the blade thickness and being arranged so as to run close to the lateral surface (100.1) of the gas-turbine blade (100), and the cooling-medium feed and discharge being effected in the base (60) of the gas-turbine blade (100).

Abstract: In a method of exchanging a machine part of a machine plant, the machine part to be replaced being one of multiple machine parts of the machine plant, the multiple machine parts being coupled to one another and being arranged on a common table plate which is anchored, via individual supports, in the ground, and which has recesses for accommodating the machine parts, a metal frame is set up. Bearings are provided on a new machine part, and the machine part is assembled, oriented, and tested on the metal frame. A machine part to be replaced is uncoupled from the multiple machine parts. The machine part to be replaced is removed from a recess in the table plate. Ground supports for the new machine part on the metal frame are installed and anchored to the ground in the area of the recess. The new machine part is positioned on the metal frame on the metal supports. The new machine part on the metal frame is connected to the metal supports.

Abstract: A drive system and a method of operating such a system are specified. The drive system comprises at least two drive groups having a plurality of drive controllers of controlled drives. The drive controllers of a drive group are synchronized via a drive bus by means of a local synchronization clock, and the local synchronization clocks are made equal to a global synchronization clock via a drive data network connecting the drive control means. The plant-wide synchronization of the drives via a global signal enables a drive system to be equipped with a virtually arbitrary number of drives. As a result of the fact that the desired values are preferably likewise transmitted synchronously, based on the global synchronization clock, between the drive control means via the drive data network, it is also the case that no time errors occur during the desired value transmission. The invention is preferably used for rotary printing machines.

Abstract: The capacitive voltage transformer is provided for a metal-enclosed, gas-filled high-voltage system. It has a cylindrical capacitor having two coaxially arranged, electrically conducting cylinders (12, 13), of which one internally arranged cylinder (12) is at a high voltage potential and outwardly bounds a current-carrying conductor (5) of the system. An externally arranged one of the two cylinders (13) is inserted in an electrically insulated fashion into the metal enclosure (4). In a first embodiment of the voltage transformer the internal cylinder (12) has an enclosing tube (16) formed from a material having a lower coefficient of linear thermal expansion than copper.

Abstract: This metal-enclosed, gas-insulated switchgear assembly is provided with at least one multiphase switch panel which is mounted on a foundation surface (8), with in each case at least one power breaker (1, 2, 3) per phase which extends along a longitudinal axis (4, 5, 6), these longitudinal axes (4, 5, 6) being arranged in a first plane, with at least one busbar system which is arranged in at least a second plane and extends along busbar axes (13, 14, 15) and in which the busbar axes (13, 14, 15) have a distance (s) between them. The distance between centers between a first connecting stub (16, 17, 18) and a second connecting stub (25, 26, 27) of the power breaker (1, 2, 3) is at least three times and at most four times as great as the distance (s) between the busbar axes (13, 14, 15). The power breakers (1, 2, 3) may be arranged offset and aligned in a row, resulting in very compact switch panels.