Abstract: An arrangement for the thermal protection of a rotor, fitted with moving blades, of a high-pressure compressor. The roots of the moving blades are inserted and locked in peripheral grooves which are at an axial distance from one another. The rotor has, between two adjacent peripheral grooves for the moving blades, at least one further peripheral groove having a hook extending over the entire periphery of the rotor. At least two plate-shaped heat-accumulation segments, each having at least one root which has a contour adapted to the hook of the rotor so that both form a contact area, are pushed radially one after the other into the further peripheral groove and locked therein. A cavity forming an insulating layer extends between the heat-accumulation segments and the rotor and between the moving-blade roots and the rotor, in which insulating layer the velocity of the compressor air is greatly reduced.

Abstract: A quench cooler for cooling a hot flowing gas includes a cylindrical shell which is connected to a hot-gas line and to a cold-gas line and which has a device for injecting water. A packed column filling the cross-section of the shell through which flow occurs is arranged downstream of the water-injection device. The packed column is designed as a cartridge which can be pushed into the cylindrical shell and has a separate casing.

Abstract: In a combined gas/steam power plant with a once-through forced-flow steam generator, a separation bottle (25) is connected between the evaporator (22) and the superheater (23). To clean the water/steam circuit, in the full-load or the part-load mode, a larger quantity of water than necessary is conveyed through the economizer (21) and the evaporator (22) via a feed pump (20). The quantity of water is selected such that wet steam passes into the separation bottle (25). This water fraction, together with all the impurities contained therein, is separated in the separation bottle and is drawn off via a clarifying line (29). Overfeeding can be regulated in such a way that the fresh steam temperature corresponds to the nominal value of the respective load point. When cleaning of the water/steam circuit is intended in the full-load mode, and without overfeeding the system, steam from a stage of incomplete evaporation can be extracted out of the evaporator and led into the separation bottle.

Abstract: A method is specified for the transmission of binary asynchronous data, with a data word length of N bits, from a transmitter via a synchronous channel to a receiver. Maximum utilization of the transmission capacity of the synchronous channel is achieved as a result of the fact that the data words are extracted from the asynchronous data and are split up in encoded form between frame words, to be transmitted, of a frame.

Abstract: In a method of operating a power station plant, which consists of a gas-turbine group (I), a steam-generating stage (II) consisting of a waste-heat steam generator (15), and a steam cycle (III), a liquid quantity increased above 100% circulates in a heat-exchange stage (15a), operating in the low temperature range, of the waste-heat steam generator (15). The portion above 100% of this liquid quantity is diverted at the end of said heat-exchange stage (15a) and is evaporated in at least one pressure stage (26). Steam (37) arising herein is then fed to a steam turbine (17) at a suitable point. A still hot liquid quantity (36) from the pressure stage (26) is fed into a feed-water tank and deaerator (22), and steam (33) arising herein is fed to a further steam turbine (18) at a suitable point.

Abstract: The isolating switch (1) contains an isolating switch housing (2) and at least two switching points (18, 19, 20) which are arranged in the isolating switch housing (2), are of axially symmetrical design, and each have one fixed switching element (7, 8, 9) and one switching element (15, 16, 17) which can move along the switching point axis (21, 22, 23). A drive shaft (11) leads into the isolating switch housing (2). From this drive shaft (11), power is transmitted via a gearbox (25) to the movable switching element (15, 16, 17). The gearbox (25) has for each switching point (18, 19, 20) a control cam (26, 27, 28) which is fixedly connected to the movable switching element (15, 16, 17), is aligned transversely with respect to the shaft axis (11) and is displaceable. It also contains a lever (29, . . . 34; 47) which is attached to the drive shaft (11) and interacts with the control cam (26, 27, 28).

Abstract: For the purpose of separating dust particles inside a cooling system of a rotor, fitted with moving blades, of a turbo-machine, a device is arranged upstream of the moving blades to be cooled and in the region of the rotor outer surface. The device has at least one feed channel through which a coolant flows, and is directed in the radial direction such that the dust particles located in the coolant accumulate on the side accelerating in the direction of rotation of the rotor. These dust particles subsequently pass into a separation chamber operationally connected to the feed channel and in which they are captured in order then to be discharged.

Abstract: A premix burner (1) essentially comprises at least two sectional cone bodies (12, 13) which are nested one inside the other in the direction of flow and the respective cone axes of which are offset relative to a center axis (10). Tangential slots (16) are thereby formed for the combustion air (9). Starting from the tip of the sectional cone bodies (12, 13), a feed lance (1) is arranged which extends downstream into the interior of the premix burner (11) and runs essentially symmetrically to the center axis (10). At least one fuel nozzle (8) is arranged at the downstream end of the feed lance (1).

Abstract: In order to reduce the commutation inductance of series-connected controllable semiconductor components (V1-V6), the latter are connected, in an essentially orthogonal manner and at a predeterminable distance (a), via spur double striplines (6, 6') to essentially planar main lines (5, 5'). All of the double striplines (5, 5'; 6, 6') have a layered structure and are mutually insulated by a thin insulating layer (7), with the result that a minimum current area is achieved. The controllable semiconductor components (V1-V6) are accommodated closely adjacent to freewheeling diodes in a module (10), the heat of which can be dissipated by cooling elements (8). Bipolar transistors having an insulated gate (IGBTs) are preferably used as controllable semiconductor components (V1-V6).

Abstract: An optical fiber transmission system is specified which can be checked in a simple way for satisfactory power reserve. For this purpose, a transmission current ID is modulated with a frequency fT by switching over the current between a normal value IDN and a smaller test value IDT, which is not equal to zero.

Abstract: A combustion chamber with two-stage combustion has primary burners (110) of the premix type of construction, in which the fuel injected via nozzles (117) is intensively mixed with the combustion air inside a premix space (115) prior to ignition. The primary burners are of flame-stabilizing design, i.e. they are designed without a mechanical flame retention baffle. They are provided with tangential inflow of the combustion air into the premix space (115). Arranged downstream of a precombustion chamber (61) are secondary burners (150) which are designed as premix burners which do not operate by themselves.

Abstract: In a thermally loaded blade for a turbomachine, the front edge of such a blade is made from a ceramic material for providing better protection. The front edge has a shell-shaped form which covers at least one part of the head stage against which flow occurs. The connection between front edge and head stage is produced on the one side by a coupling-forming indentation and on the other side by an elastic element. The elastic element produces a retaining action at the location where it is placed and a frictional connection, having an effect on the indentation, on the other side of the blade. Cooling air bores in the head stage provide for a cooling effect on the ceramic front edge.

Abstract: The power circuit-breaker is provided with at least one arcing chamber which extends along a central axis and has at least one power interruption point with at least one contact which is moved by a drive. A closing resistor is connected in series with the power interruption point, having a resistive contact which is connected in parallel with the closing resistor and which closes after the power interruption point during the connection operation and opens after the power interruption point during the disconnection operation. This power circuit-breaker has a closing resistor and a resistive contact which has a simple and space-saving structure and which accurately timed actuation of the resistive contact is achieved. The resistive contact is mechanically connected to the at least one moving contact rectilinearly along at least one axis.

Abstract: The device for precontrolling the feedwater quantity of a cooling-air temperature controller (1) for a once-through cooling-air cooler (2) in combined power plant systems comprises a function element which has as inputs the signals corresponding to the air-outlet desired temperature (.THETA..sub.a soll), the air-inlet temperature (.THETA..sub.e), the air volume flow (M), the main steam pressure (p) and the water-inlet temperature (.theta..sub.e), and as outputs the signals of the approximated precontrolled feedwater volume flow (m.sub.FFO) and the controller gain (VR). A correcting quantity depending on the load (L) and the ambient temperature (T.sub.U) is additionally introduced for operation in the unsaturated temperature range.

Abstract: In a high-power semiconductor module (10), in which a plurality of first submodules (13, 14, 16, 17) are arranged in an electrically insulated manner in a common housing (12) and on a common cold plate (11) and are interconnected with one another, the first submodules (13, 14, 16, 17) each ?lacuna! individual controllable power semiconductor switches (13a), short-circuit-proof operation in conjunction with relatively high switching frequencies is made possible, with a relatively low current-carrying capacity and an increased withstand voltage, by virtue of the fact that the first submodules (13, 14, 16, 17) are connected in series within the module for the purpose of increasing the withstand voltage.

Abstract: In a temperature probe, in particular for use in the waste-gas diffusor of a gas turbine, a probe tube (1) projecting into the hot-gas region of the waste-gas diffusor is provided with an inner bore running in the direction of the tube axis of the probe tube (1). At the same time, the probe tube (1) is provided over its length with a number of throughflow ducts running transversely relative to the tube axis and in which are located a number of thermocouples (22), the connecting points (23) of which are arranged in the throughflow ducts. The thermocouples (22) are connected to a compensating line (13) in a terminal box (14). Each thermocouple (22) is arranged in a solely heat-movably guided manner in a protective tube (18) which is fixed relative to the inner bore of the probe tube (1).

Abstract: A partial-discharge measuring device (3) which detects partial discharges in a gas-insulated, metal-enclosed, high-voltage system. The device includes an annular-gap antenna (6) arranged on the inner surface of the metal enclosure (1), a coaxial measuring cable (7) guided to a measuring instrument, and a tapering adaptor conductor (8) which connects the annular-gap antenna (6) and the coaxial measuring cable (7). The annular gap (9) of the antenna is determined by a plate-shaped electrode (10) which is inserted in an electrically insulated fashion into an opening (5), provided for a flanged attachment (4) in the metal enclosure (1). The adaptor conductor (8) includes an inner conductor, which supports the electrode (10), and is guided onto the shielded conductor (14) of the measuring cable (7), and an outer conductor which is guided onto the shield (15) of the measuring cable (7).

Abstract: In order to avoid filter excitations of subharmonics or intermediate harmonics, that is to say of oscillations in the frequency range between integral harmonics of the mains frequency (f.sub.N), in the case of an attenuation resistor (R1, R3, R3') in parallel with a series resonant circuit comprising a filter inductor (L1, L3) in series with a filter capacitor (C1, C31, C31'), the resistance is dimensioned in such a way that a current gain of the filter (F1-F3) at its frequency pole points with an AC mains (1) is not greater than 6-fold. Double low-pass filters (F1, F2) and high-pass filters (F3) with attenuation resistors (R1, R3, R3') are particularly suitable as filters (F1, F3).

Abstract: The object of the invention is to provide an improved bearing support arrangement for rapidly rotating rotors, with which arrangement the service life of the bearing device is increased and both its fabrication costs and the expenditure on assembly are reduced. This is achieved according to the invention in that the bearing support arrangement (10) is of one-piece design. It comprises an outer flange (11) connected to the housing (2), a gimbal ring (12) and an inner bearing bush (13) which receives the bearing or the bearings (3). In each case a circumferential slot (14, 15) is formed both between the gimbal ring (12) and the outer flange (11) and between the gimbal ring (12) and the bearing bush (13). The gimbal ring (12) is respectively connected to the bearing bush (13) and to the outer flange (11) via two inner and two outer webs (16, 17) which interrupt the respective circumferential slot (14, 15).

Abstract: A power electronic circuit arrangement which comprises a first power converter is specified. A second power converter is connected between the load terminals of the first power converter and a load. The negative or positive values of the DC voltage intermediate circuits of the first and second power converters can be added by means of corresponding driving of the power converters. This achieves finer voltage gradation and, consequently, an improved approximation of the resulting output voltage to the sinusoidal waveform.