Abstract: A photovoltaic device includes a first group of photovoltaic cells of a first cell type, the first group of photovoltaic cells operable to produce a first current and a first voltage, and a second group of photovoltaic cells of a second cell type that is different than the first cell type, the second group of photovoltaic cells operable to produce a second current and a second voltage. A first power electronics unit is connected to the first group of photovoltaic cells, and a second power electronics unit is connected to the second group of photovoltaic cells. The second power electronics unit is separate from and not communicating with the first power electronics unit. A control device is operable to vary a first property of the first power electronics unit to vary the first current and the first voltage and to vary a second property of the second power electronics unit to vary the second voltage and the second current independent of the first voltage and the first current.

Abstract: In some embodiments, a shielded coil assembly is provided that includes (1) a coil having an outer surface, an inner surface, an upper end surface and a lower end surface and a first insulating material formed over the outer surface, inner surface, upper end surface and lower end surface of the coil; and (2) a conductive shield comprising a conductive paint applied along the first insulating material so that the conductive paint extends over at least a portion of each of the outer surface, inner surface, upper end surface, and lower end surface of the coil. In one or more embodiments, a dry-type transformer may be formed using the shielded coil assembly. Numerous other embodiments are provided.

Abstract: A gas monitoring system includes a gas-insulated switchgear, wherein the gas-insulated switch gear has at least two separated chambers which are filled with an insulating gas surrounding high or medium voltage components. A first sensor is connected to the first chamber and a second sensor is connected to the second chamber, both sensors adapted to measure a physical property of the insulating gas in their respective chambers over time. A computer unit is adapted to calculate from the two sensor measurements a leakage rate of the insulating gas in one of the two chambers using an adaptive filter, in particular a Wiener filter.

Abstract: A pilot cone for use in a burner arrangement having a pilot burner includes a casing which widens downstream along a burner axis and has a plurality of cooling air passages passing through it; an inner wall which extends upstream starting from the upstream end of the casing; an annular gap which runs along the inner wall on the radially outer side; and a plurality of cooling air openings which establish a connection between the annular gap and the cooling air passages. Another wall extends upstream at a distance from the inner wall starting from the casing and delimits the annular gap on the radially outer side, the inner wall having a plurality of holes.

Abstract: A test device for a destruction-free test of rotationally symmetrical objects, in particular rotors of gas or steam turbines. The test device has at least three elongated skid bodies which extend in the circumferential direction and parallel to one another, which are interconnected, and which define contact surfaces for positioning on the circumferential surface of the object to be tested, wherein a test body receiving area for an ultrasonic test probe is provided at least on the center skid body.

Abstract: An electrolyser for carbon dioxide reduction, having an electrolytic cell, with a cathode gas diffusion electrode and an anode gas diffusion electrode, in which a first side of the cathode gas diffusion electrode adjoins a cathode gas chamber in a planar manner and likewise a first side of the anode gas diffusion electrode adjoins an anode gas chamber, and an electrolyte chamber common to both gas diffusion electrodes is provided, which extends from the cathode gas diffusion electrode to the anode gas diffusion electrode and is at least partially delimited by the two gas diffusion electrodes with their second sides facing away from the respectively associated gas chambers.

Abstract: An apparatus includes a closed gas system having: a working circuit in which a compressor for a working fluid, a first heat exchanger for heating the working fluid, an expander and a second heat exchanger for cooling the working fluid are arranged; a first pressurised gas tank and a first gas pipe which branches off from the working circuit between the compressor and the first heat exchanger and opens into the first pressurised gas tank; and a second gas pipe which branches off from the first pressurised gas tank and opens into the working circuit between the expander and the second heat exchanger. A method controls pressure in a closed gas system using the apparatus.

Abstract: A guide vane ring which is divided into an upper and into a lower guide vane ring half, with an inner ring which is split at least in two, has a substantially U-shaped cross section, and forms a radially outwardly open flow duct which extends in the circumferential direction and is delimited by way of an inner ring bottom wall and two inner ring side walls, and with a multiplicity of vane platforms which receive guide vanes, are arranged along the outer circumference of the inner ring, and have holding webs which in each case project radially inwards, are spaced apart from one another in the axial direction, and engage around the inner ring side walls from the outside, wherein wear elements are inserted into gaps which are present between holding webs and directly adjacently arranged inner ring side walls.

Abstract: A voltage potential measurement arrangement for measuring a voltage potential on a conductor in an encapsulated power switching device includes at least a portion of the conductor surrounded by a field control component, in particular a field control electrode, having a measuring electrode for capacitive coupling to the conductor. The measuring electrode is disposed outside of the field control component and the field control component is penetrated by at least one aperture at the height of the measuring electrode. A corresponding encapsulated power switching device is also provided.

Abstract: A method for determining operating properties of a drill-rod borehole pump, having a pump head, which is connected to a kinematics converter via a drill rod, and the kinematics converter is driven by an electric motor, and furthermore a measuring device is provided for measuring the power consumption of the motor during operation of same.

Abstract: Power plant system and method of operating the same, the power plant system having a solid oxide fuel cell and a gas turbine, wherein the fuel cell and the gas turbine are set up such that compressed charge air of a compressor of the gas turbine can be provided to the fuel cell and/or an exhaust gas of the fuel cell can be provided to a combustion chamber of the gas turbine, wherein the system is configured such that the solid oxide fuel cell can be operated in a cell mode as well as in an electrolysis mode and wherein the solid oxide fuel cell is set up such that an excess grid energy is used for executing an electrolysis in the electrolysis mode of the fuel cell and thereby to chemically reduce water and/or carbon dioxide into hydrogen and/or syngas.

Abstract: A generator unit as a component of a power plant connected to the electrical grid, includes a first generator with a rotor connected to a drive turbine via a shaft, a second generator and a three-winding high-voltage transformer. The first generator is an active power generator and the second generator is a purely reactive power generator, and the first and the second generators are connected to the electrical grid via a separate generator output line and via the three-winding high-voltage transformer.

Abstract: By using an accumulator which is charged by a generator upon starting up a steam turbo set, the steam turbo set can be started up more quickly. Energy generation plant, which has at least: a steam turbine and a generator, wherein the generator can be driven at least by the steam turbine, and optionally a gas turbine, which also the generator can drive, the generator electricity for electrical and can generate networks, with an electrical storage device, in particular an accumulator, which can optionally be connected to the generator in order to be charged, in particular when the generator is not connected to the electrical network.

Abstract: Compressor rotor structure and methodology for harmonizing compressor aerodynamics and rotordynamics are provided. Disclosed embodiments benefit from a compressor design effective for improving rotordynamics (e.g., stiffer rotor structure) without reducing a usable aerodynamics range of the compressor. This design may involve variation of the rotor structure along the rotor axis to locate respective surfaces defined by respective inlets of the one or more impellers at a varying distance relative to the rotor axis based on respective ratios selected for the configuration of the impeller bodies. This arrangement may be effective for improving rotordynamics while satisfactorily meeting the respective varying aerodynamics requirements at the various compression stages by the impeller bodies.

Abstract: A method for repairing a damaged leading or trailing edge region of a metallic turbine blade, which has a suction-side blade wall, a pressure-side blade wall and a leading edge and a trailing edge, includes: removing the damaged leading or trailing edge region, with a cutout being formed; providing a replacement part which can be inserted in form-fitting fashion into the cutout and which restores the intended geometry of the turbine blade; inserting the replacement part in form-fitting fashion into the cutout in a predetermined insertion direction, and cohesively connecting the replacement part to the turbine blade, wherein mechanical connection of the replacement part and turbine blade using separate fastening elements is performed in addition to the cohesive connection.

Abstract: A method for provisionally ensuring the functional capability of a housing of a machine in the event of damage to the housing, the housing having a housing upper part and a housing lower part, which are detachably fastened to each other by housing flanges and by threaded bolts that extend through the housing flanges and are secured by nuts, the damage to the housing being at least one crack in one of the housing parts, which extends toward the other housing part. The housing is reinforced by support plates, which are each fastened to the outside of the housing flanges. A housing is reinforced by support plates of this type.

Abstract: A water delivery system (18) for delivering water for injection into gas turbine engine combustor (4) includes a centrifugal pump (19) and a metering valve (23). The centrifugal pump (19) has an inlet (20) connected to a water source and a discharge (21) connected to a water supply line (22). The metering valve (23) is connected to the water supply line (22) downstream of the discharge (21) of the centrifugal pump (19). The water supply line (22) is connected to an injector nozzle (14) downstream of the metering valve (23). The metering valve (23) is operable to regulate a flow rate of water in the water supply line (22), to thereby meter an amount of water supplied to the injector nozzle (14).

Abstract: A generator injection tool is provided. The generator injection tool injects an adhesive into a generator that includes a rotor positioned within a stator having a stator vent, the stator and rotor having a gap therebetween. The generator injection tool includes a first carriage sized to fit within the gap, a tube, a first motor, a controller, and an adhesive source. An end of the tube is movable between a first position in which the end is outside of the stator vent and a second position within the stator vent. The first motor is operable to move the tube between the first position and the second position. The controller is operable to selectively activate the first motor to position the end of the tube within the stator vent. The adhesive source moves the adhesive through the tube end to inject a portion of the adhesive into the stator vent.

Abstract: An improved ceramic material for heat insulation is achieved by the following selection of specific stabilizers and the adapted proportions: Base of zirconium dioxide (ZrO2) with: 1.0 wt. % to 9.0 wt. % of base stabilizers: yttrium oxide (Y2O3), hafnium oxide (HfO2), wherein at least yttrium oxide (Y2O3) is used, and at least one of the additional stabilizers: erbium oxide (Er2O3) and/or ytterbium oxide (Yb2O3) with a proportion of 0.2 wt. % to 20 wt. %.

Abstract: A method for determining the average distance between a measurement device and a conductor includes determining a profile of a horizontal component using the horizontal position of the device that indicates the orthogonal distance between the device and the longitudinal axis of the conductor parallel to the earth's surface, measured at at least two different horizontal positions, determining a profile of the vertical component, which is associated with the determined profile of the horizontal component, using the horizontal position of the device, wherein the vertical profile is determined by measuring the vertical components associated with the horizontal components, determining the ratio of the profiles as a function using the horizontal position of the device, determining the derivative of the ratio according to the horizontal position, determining the reciprocal of the derivative, and determining the average distance between the devices and the conductor from the reciprocal of the derivative.