Abstract: A reclosing apparatus for the auxiliary systems of a plant, in particular a power station, has drive modules (81) for actuating electrical drives (23a, 23b, 33, 53a, 53b, 63, 73) of the auxiliary systems. Each drive module (81) of a reclosable drive (23a, 33, 53a, 63, 73) is assigned a reclosing module (82). When a voltage interruption occurs, the reclosing modules (82) switch the drives (23a, 33, 53a, 63, 73) by opening switches (22a, 32a, 52a, 62, 72). If the end of the voltage interruption is detected within a predetermined time, the reclosing modules (82) switch the drives (23a, 33, 53a, 63, 73) on again. Each busbar (2, 3, 5, 6, 7) which supplies a drive (23a, 33, 53a, 63, 73) provided with a reclosing module (82) is equipped with a microprocessor-controlled voltage monitoring device (21).

Abstract: A steel profile clamp is used to join flanged component parts. The profile clamp has at least partially conical side walls that are bent radially inwardly. The profile clamp has welding joints to maintain the shape of the clamp. The steel is martensitic for increased load-carrying capacity of the joint. The steel material, in an ambient temperature range of 20° C. to 750° C., has a coefficient of thermal expansion that is at least 0.3×10−6 m/m° C. lower than that of the coefficient of thermal expansion of a ferritic casting material. The method for manufacturing the profile clamp includes prequenching and tempering the material of the profile clamp when it is in the form of a strip. After forming and welding the profile clamp, the weld is subject to induction tempering.

Abstract: In a method of operating a gas turbine, in which a gaseous fuel is burned in a combustion chamber and the hot combustion gases which are produced in the process are directed through the gas turbine, and in which method the gaseous fuel is fed to the combustion chamber via a plurality of controllable burners, working in parallel and arranged on one or more concentric, essentially circular rings, and is sprayed into the combustion chamber via fuel holes, high safety and availability within various operating ranges is achieved in a simple manner owing to the fact that the burners are divided into at least two groups (40-42) of burners, these groups in each case include the burners of one of the rings, and these groups are individually activated as a function of the operating state of the gas turbine.

Abstract: An iron aluminide coating consists essentially of: 5-35% by weight aluminum 15-25% by weight chromium 0.5-10% by weight molybdenum, tungsten, tantalum and niobium 0-0.3% by weight zirconium 0-1% by weight boron 0-1% by weight yttrium the remainder being iron and also impurities and additaments arising from its production.

Abstract: A method for detecting installation and/or calibration errors in signal output units of a partial-discharge measurement system, where the signal output units are arranged at various points in an electrical insulation system, includes: Calibrating a selected one of the signal output units by injecting a first calibration pulse between a high-voltage side of the insulation system and ground. Storing calibration data obtained during the step of calibrating. Recording and storing a first set of partial discharge signals and an amplitude of the first calibration pulse via the selected signal output unit. Adopting the stored calibration data for the selected signal output unit, for calibrating the other signal output units. Recording and storing, via the other signal output units, a second set of partial discharge signals and an amplitude of a second calibration pulse. And, comparing the stored partial discharge signals for all the signal output units with one another.

Abstract: A cooling passage of a component subjected to high thermal loading, which is formed as a cavity (2, 20, 30), running in a longitudinal direction (L) and curved orthogonally to the longitudinal direction (L), between a first wall (5) and a second wall (6), which in each case are connected to one another in a laterally adjacent manner, which has ribs (7, 17, 27), which are arranged on the first wall (5) and the second wall (6) such that they alternate in a longitudinal direction (L) and are staggered relative one another and, at least in sections, assume a non-orthogonal angle relative to a projected center axis (10′), and through which a cooling fluid (K) can flow in a longitudinal direction (L), in which case, when the profile of the cavity (2, 20, 30) is curved orthogonally to the longitudinal direction (L), the ribs (7, 17, 27) are formed in such a way that, in each case locally with regard to the adjacent rib of the opposite wall, they maintain a distance (a) which is half a respective local rib spac

Abstract: The resistor is designed in the form of a column and has a cylindrical resistor body which is arranged between two planar electrodes, aligned parallel, and is made of a ceramic material. The resistor is preferably a varistor on a metal-oxide base, and is then used as a voltage-limiting element in an overvoltage suppressor. The strength of the ceramic material and the length of the resistor are chosen to be as great as possible. However, the length of the resistor is at most sufficiently large that damage to the ceramic resistor body caused by thermally produced pressure waves is avoided when the resistor is loaded in an electrical field of given magnitude with at least one highly energetic current pulse of defined amplitude, form and duration.

Abstract: Arm consisting of angularly displaceable linkages (1, 2, 3), such as a manipulator, having a fixed end carried by a support (4) and a free end carrying a tool or workpiece (7), whereby each hinge is provided with controllable blocking means for the purpose of immobilizing said linkages relative to each other, wherein a member counter-balancing the torque is arranged at one or more pivot axes to compensate the weight of said linkages freely movable relative to a hinge towards said free end.

Abstract: An angular acceleration transducer measures angular acceleration of a torque-transmitting shaft of a drive device, and includes a measuring shaft having a torque transducer and a transducer flywheel, and which is connected to the torque-transmitting shaft in such a way that it follows rotational movement of the torque-transmitting shaft with a known ratio.

Abstract: In an ignition appliance for a heat generator, the supply lines for air (70) and fuel gas (60) are led directly into a flame tube (40). The igniter (51) is arranged in an ignition space (50) remote from the flame tube (40) and connected to the flame tube (40). The ignition space (50) is connected to the air supply passage (70) and the gas supply passage (60) via connecting ducts (55, 56). If the supply passages for air and fuel gas (70, 60) are dimensioned so as to be sufficiently large, the pressure drop between the inside of the ignition space (50) and the feed lines (60, 70) is small. The fuel/air ratio present at the igniter (51) is therefore essentially determined only by the ratio of the cross sections of the connecting ducts (55, 56). The flow relationships in the ignition space (50) are likewise substantially decoupled from the air and fuel gas flows supplied overall to the ignition appliance.

Abstract: The object of the invention is to provide an axial-flow turbine having an improved efficiency. In addition, the assembly and dismantling possibilities are to be extended. According to the invention, this is achieved in that the parting seam (17) between the outer ring (12) of the nozzle ring (15) and the cover (8) is arranged on the moving-blade side of an imaginary plane (20) passing through the center of the gap width (19) of the axial gap (18).

Abstract: An active filter device provided for compensating harmonic distortion in a supply line by injecting for each harmonic (fk) to be considered a compensation current. The compensation current being determined by injecting a monitoring current on the supply line at a first (f1) and second (f2) frequency value, offset respectively on either side of the considered harmonic, and measuring response currents generated by the supply line upon injection of said monitoring currents.

Abstract: Described is a sealing arrangement for reducing leakage flows inside a rotary fluid-flow machine, preferably an axial turbomachine, having moving and guide blades, which are in each case arranged in at least one moving- or guide-blade row respectively and have blade roots, via which the individual moving and guide blades are connected to fastening contours. A sealing element having felt-like material is provided between at least two adjacent blade roots within a guide- or moving-blade row or between guide and/or moving blades and adjacent components of the fluid-flow machine.

Abstract: A method of casting a directionally solidified article such as a component of a gas or steam turbine. The casting is performed in a casting furnace comprising a heating chamber, a liquid cooling bath as a cooling chamber and a shell mold. During casting, shell mold is fed with liquid metal and withdrawn from the heating chamber to the cooling chamber while the interior of the casting furnace is supplied with an inert atmosphere of Ar and/or He in the pressure range of 0.01 to 1 atmosphere, with a preferred range of 0.05 to 0.25 atmosphere. The method can provide improved heat transfer across the shell mold allowing a higher withdrawal rate, reduction in defects and/or improvement in properties of the cast articles.

Abstract: The temperature can nowadays be reduced by about 400° C. as a result of the cooling of the guide vane (15) of the first guide wheel. The many film bores leading outward from the guide vane (15) must therefore remain free of blockages or deposits caused by suspended matter in the cooling medium. Only pure gas must therefore be used as the cooling medium for the first guide wheel. This purpose is served by a dust separator which is designed advantageously as an axial cyclone (24, 24′). The latter has no moving structural parts, has a simple design, is therefore insusceptible to faults and can be exposed to high temperatures. The axial cyclone is a centrifugal deduster without gas stream reversal.

Abstract: A cooled vane for a gas turbine or similar device including a vane blade constructed of a suction side wall and a pressure side wall that are connected via a leading edge and a trailing edge with each other, which has an essentially radially extending cavity through which a cooling medium is capable of flowing. The vane blade has multiple cooling channels that, starting from the cavity, extend through a vane section adjoining the trailing edge and formed by sections of the suction side wall and the pressure side wall, and end at the trailing edge. A first row of cooling channels is associated with the suction side (SS) of the vane blade, and a second row of cooling channels is associated with the pressure side (DS) of the vane blade. The cooled vane has improved cooling efficiency and can be produced entirely with a casting process while complying with basic geometric conditions.

Abstract: A method for transmitting digitized payload data and signalling data over a common channel. The signalling data are multiplexed with the payload data using a suitable coding. The signalling bytes are preceded by at least one header bit, and confusion between the payload data and the header byte is prevented by inverting at least one bit of the payload data byte when a payload data byte corresponding to the header byte occurs.

Abstract: A high-power semiconductor module having a casing which encloses at least one semiconductor element has an explosion protection element. This explosion protection element is a protective sheath which surrounds at least a portion of the casing and traps fragments which are projected outward in the event of an explosion of the semiconductor element. This prevents people from being injured or adjacent modules from being damaged by such fragments.

Abstract: In a gas turbine (10) with a plurality of individual burners (B1, . . . , B6; Bn) which are connected to a fuel distribution system (21) and are supplied with fuel from a common fuel feed (28) via the fuel distribution system (21), there being provided, within the fuel distribution system (21), means by which the fuel mass flows to the individual burners (B1, . . . , B6; Bn) can be varied in order to improve the operating parameters of the gas turbine (10), an improvement in the operating parameters is achieved in a simple way in that a fixed throttle member, determining the fuel mass flow to at least one of the burners (B1, . . . , B6; Bn), is arranged in the fuel distribution system (21) upstream of the at least one burner, and in that the reduction in cross section of the throttle member is selected in such a way that existing inequalities in the fuel distribution system (21) as regards the fuel mass flows to the individual burners (B1, . . . , B6; Bn) are reduced.

Abstract: An arrangement for the selective introduction of fuel and/or water into a combustion chamber, in particular the combustion chamber of a gas turbine, comprises valve means, by which a fuel feed line (18) for the fuel and a water feed line (19) for the water can be selectively connected to a common combustion-chamber feed line (17) leading to the combustion chamber, or the fuel feed line (18) and the water feed line (19) can be connected to one another for flushing the feed-line system, or the fuel feed line (18) and the water feed line (19) can be shut off individually.