Abstract: The electronic instrument has a two-part housing (26, 27) which surrounds in a dusttight manner a printed board fitted with at least one electronic component. The housing (26, 27) contains a ventilating orifice (50) led through one of its two parts. A ventilating device (51) is arranged in this ventilating orifice (50), with an air-permeable diaphragm permeable to water vapor in a directionally dependent manner and with a splashwater guard preceding the diaphragm.Undesirable condensation water in the housing interior is avoided, since excess water vapor present in the housing interior is led outward through the diaphragm while the electronics are operating. At the same time, the splashwater guard prevents the diaphragm from coming into contact with splashwater and its operating capacity from being impaired.

Abstract: This power circuit-breaker has at least one cylindrically constructed arcing chamber which is provided with a stationary contact, with a moving contact and with a quenching zone between the two contacts. A shaft of the moving contact is permanently connected to a blowout volume which is closed off on the stationary contact side by an insulating nozzle through which at least one flow channel passes. The arcing chamber has a first compression volume which is operatively connected to the blowout volume and to a second compression volume. It is intended to provide a power circuit-breaker in which the blowing-out of the arc with pure SF.sub.6 gas is made stronger. This is achieved by providing a moving auxiliary piston between the first compression volume and the second compression volume and by the auxiliary piston being connected to the moving contact via a direction-changing device.

Abstract: The overvoltage suppressor has a cylindrical active part, which is arranged between two electrically conductive, cylindrical fittings and contains at least one varistor on a metal-oxide base, as well as an insulating material housing which surrounds the active part and is closed at the ends by the fittings. The insulating material housing is filled with an insulating material which surrounds the active part on the outside and is formed by an injection-molded or extruded insulating material tube and by a shielded weather protection which is held on the outer surface of the tube. A first of the two fittings is integrally formed into the tube at a first of its two ends. An external thread on the second fitting is screwed into an internal thread in the tube, forming a contact force.

Abstract: A gaseous fuel (B) is fed to a a premixing burner which has a main line (10) for the feed of oxygenous gas (G) into at least one mixing zone and/or a combustion zone (VMZ, EMZ, VZ). In the process, at least a first portion of the fuel is fed to the main line (10), in which it is mixed with oxygenous primary gas (PG) inside at least one premixing zone (VMZ) and forms a premixture. The concentration of the fuel in the premixture (VM), under the respective operating conditions of the burner, is selected in such a way that the premixture lies outside the ignition limit. The premixture (VM) is fed to a final mixing zone (EMZ) and is mixed therein with the residual fuel (RB) likewise supplied and/or with oxygenous secondary gas (SG). The resulting final mixture (EM) is fed to a following combustion zone (VZ).

Abstract: In an air-cooled electrical machine having reverse cooling in a closed cooling circuit, a two-stage blade cascade for the optimum incident flow of cooling air to the rotor (4) and the rotor winding (29) is provided between a rotor cap plate (22) and a rotor shaft (28). The first blade cascade stage (30b) in the direction of flow is a deceleration cascade having essentially pressure-generating properties, and the following blade cascade stage (30a) in the direction of flow is a deceleration cascade having essentially deflecting properties. The flow cascade is provided radially on the inside with a sealing shroud band (32).

Abstract: The invention relates to a device for operating an annular combustion chamber (15) which is equipped with combined burners (1) for liquid (4) and gaseous fuels (9), in particular burners of the double-cone design, each burner (1) having a fuel lance (3), with at least one additional air passage (7), for feeding the liquid fuel (4) and an airblast nozzle (2) for atomizing the liquid fuel (4), into which airblast nozzle (2) atomizing air (5) is fed from outside the burner hood (13), and an adjusting mechanism being provided for at least partly throttling the inflow of the atomizing air (5) during gas operation, wherein the adjusting mechanism is an external valve (21) which is arranged in a main feed line (19), coming from the compressor outlet (18), for the atomizing air (5), the main feed line (19) leading into a ring line (20), and the ring line (20) being connected to the head (24) of each fuel lance (3) via one branch line (23) each.

Abstract: The support frame according to the preferred embodiments of the invention reduces the abrupt strains acting upon a foundation to such an extent that light and hence more economical foundations for the device secured to the support frame can be used. A preferred embodiment of the support frame includes at least two resiliently embodied girders and at least one crossbar connecting said girders. At least one securing point is provided on the girders or the crossbar for receiving a structural component to be supported. At least one connecting point is provided on each of the girders, for connecting the girder to a foundation. An interstice is provided between the respective girders and the foundation, wherein the interstice is bridged only at the at least one connecting point. The resilient girders and the interstice allow the impact upon the foundation to be dampened.

Abstract: In a method of operating a combined-cycle plant, which essentially comprises a gas-turbine group, a waste-heat steam generator (14) and a steam cycle equipped with a steam turbine (17), the gas-turbine group being operated according to sequential combustion (4, 9), at least one steam quantity (50) proportioned by a control (C) is extracted at a suitable point in terms of pressure in order to increase the operational output of the steam turbine (17). This steam quantity (50) is then fed to the gas-turbine group at a suitable point in such a way that, to maintain the output thus induced, at least the metering (D, E) of a fuel quantity (5, 10) at at least one combustion chamber (4, 9) is influenced.

Abstract: In the case of an air-cooled electric machine with reverse cooling in the closed cooling circuit, a cooling arrangement is arranged in a foundation pit (10) underneath the machine and constructed in a modular fashion. It comprises a plurality of coolers (11) which are arranged independently of one another in the foundation pit (10) and separated from one another by separating walls extending perpendicular to the longitudinal direction of the machine. The outlet openings of the coolers (11) are freely connected to cold-gas chambers (14, 16) between the machine housing (1) and stator laminated core (2). The inlet openings of the coolers (11) are freely connected to the outflow spaces of the two fans (12) at the machine end faces. This design permits rapid exchange and/or shutdown of a cooler in addition to optimum guidance of cooling gas.

Abstract: In a method of operating a gas-turbine group and of cooling the units subjected to high thermal loading, a portion of compressor air (18) is diverted upstream of a first combustion chamber (2) and fed through a generator (14) working toward conversion and as a heat exchanger. A natural-gas/water or natural-gas/steam mixture (15) flows in counterflow through the same generator (14). With the cooling of the compressor air (18) inside the generator (14), the energy required for an endothermic reaction of the mixture (15) is released.

Abstract: A two-stage method is proposed for producing a highly transparent anode emitter (2) in a GTO (1). In a first step, an anode emitter (2) is indiffused whose thickness is greater than 0.5 .mu.m and whose doping concentration is greater than 10.sup.17 cm.sup.-3. In a second step, the emitter efficiency of the anode emitter (2) is subsequently reduced to a desired degree by local carrier life setting.

Abstract: An exhaust gas turbine for an exhaust gas turbocharger has a nozzle ring having an inner ring and an outer ring supporting a plurality of guide vanes. The nozzle ring is diagonally supported between a covering ring and the inlet casing, with the outer ring bearing against the covering ring and the inner ring bearing against the inlet casing. The outer ring provides an axial expansion gap with gas inlet casing and a radial expansion gap with the gas outlet casing. The nozzle ring is free to expand into the axial and radial gaps as a result of thermal expansion, without causing stress to the adjacent components.

Abstract: A method and a device for correcting the DC offset of a converter are specified. The invention is defined in that the output voltage of the converter on the AC voltage side is fed to an essentially passive low-pass filter which reduces the output voltage to a level which can be processed electronically. Connected downstream of the low-pass filter is a controller which controls the DC offset essentially to zero by delaying the switching commands. The low-pass filter and the controller are arranged at a high-voltage potential.

Abstract: In a gas-cooled electrical machine, the conductor bars (3, 4) in the winding overhang are cooled directly by a flow element of the cooling gas flow which is passed through cooling channels (8) located within the eyes (5a, 5b) of the bar ends. To this end, the bar levels of the winding bars, which are designed as a two-level bar, are spaced apart from one another in the eye region, and thus form a radial cooling channel (8). These radial cooling channels (8) are coupled to the discharge eyes (5b) by pipe connections (10) which are connected electrically, and in terms of the flow, to round connections (20). The cooling channels (9) in the round connections (20) are connected by means of insulating tubes (31) or insulating hoses to an induction area (32) of the machine fan, which is separated from the winding overhang area (30) by a bulkhead wall (33). The invention allows the bar ends and the round connections (20) connected to them in the winding overhang to be cooled optimally, since the cooling is direct.

Abstract: An iron-nickel superalloy of the type IN 706 has an addition of 0.02 to 0.3 percent by weight of boron and/or 0.05 to 1.5 percent by weight of hafnium. By means of this addition, a virtual doubling of the ductility is achieved as compared with an addition-free iron-nickel superalloy of the type IN 706, while the hot strength is reduced only slightly. The alloy is particularly suitable as a material for rotors of large gas turbines. It has a sufficiently high hot strength. When locally acting temperature gradients arise unwanted stresses can occur to only a slight extent because of the high ductility of the alloy.

Abstract: The system serves to transmit electrical energy in conurbations. It has a gas-insulated cable (1) having at least one high-voltage electrical conductor (8) arranged in a pipe (101) filled with insulating gas. The gas-insulated cable (1) contains at least two underground cable sections (11, 12), which can be operationally interconnected at an installation point (5) accessible from the outside. Such a system is distinguished by high availability, is easy to maintain and can be produced in a method in which impairment of the infrastructure of the conurbation accommodating the system is largely prevented.

Abstract: The Rogovski coil (1) is provided with a winding (2) applied to a winding support made from an insulating material. It has a central axis (4) and an opening (5), which is enclosed by the winding support and is penetrated by the central axis (4). A particularly homogeneous winding (2) and, associated therewith, very accurate current measurement are achieved by virtue of the fact that a surface, facing the central axis (4), of the winding support is provided with first stops (7), which are distributed on the circumference, extend in the direction of the central axis (4), and divide the winding (2) into winding segments (9). In this case, the spacing between in each case two of the first stops (7) is always an integral multiple of the diameter (D) of the wire forming the winding (2).

Abstract: In a method of operating a steam turbine which consists of at least two separate turbine sections (11, 15), working at different pressures from one another, and works with at least one reheat, in which arrangement the steam is directed to at least one reheater (13) after flowing through the separate turbine section of higher pressure (11), is heated in said reheater (13) and is then fed to the separate turbine section of lower pressure (15), the separate turbine section of lower pressure (15) is fed with cooler steam during the starting and run-up phase than during full-load/continuous operation.

Abstract: A process for the production of a body of material stable at high temperatures. In this process, the body of material is formed by solution annealing and subsequent precipitation hardening of a hot work-hardened starting body composed of an iron-nickel superalloy of the type IN 706 provided in a furnace. The body of material is distinguished by a particularly high ductility in combination with high hot strength if the solution-annealed starting body is cooled from the annealing temperature envisaged for the solution annealing to the temperature envisaged for the precipitation hardening at a cooling rate of between 0.5.degree. and 20.degree. C./min.