Abstract: A method and device for coating a component wherein the cooling fluid ducts contained in the component have to be reopened following the coating step. The component has a first region and a second region, where the first region includes at least one cooling fluid opening having an adjoining cooling fluid channel and where the first region is to be coated with a coating material which is not to be applied in the second region.

Abstract: A method for controlling a gas turbine, having a measurement step, a prediction step which is carried out after the measurement step, and a control step which is carried out after the prediction step. In the measurement step, a state variable of a combustion within a gas turbine is measured. In the prediction step, a future combustion dynamic is predicted using the measured state variable. In the control step, a control signal is output using the prediction of the future combustion dynamic.

Abstract: Various teachings of the present disclosure include an electrical switching device. The device may include: two contactable conductor elements with adjustable spacing set by a movement apparatus; and a housing defining a switching chamber and at least partially surrounding the at least two conductor elements. The housing has an insulator body and regions of an electrical contact. The housing includes an external refraction-controlling coating with a dielectrically insulating matrix made of a material with a permittivity ?r>/=2.

Abstract: A method determines the overload capacity of a high-voltage device. The method includes creating a load forecast request for a predefined time period, determining an operational state of the high-voltage device by obtaining state parameters, transmitting the load forecast request and the state parameters at a request time to a load-forecasting model, and determining the maximum utilization in the predefined time period by the load-forecasting model, with which the overload capacity of a high-voltage device can be fully exploited. A lifetime consumption of the high-voltage device before the request time is derived from measured values by obtaining an actually consumed lifetime and the actually consumed lifetime is fed to the load-forecasting model as a state parameter. The load-forecasting model then determines the maximum overload capacity depending on the actually consumed lifetime.

Abstract: A safety apparatus for containing a release of energy from a tension stud of a rotor assembly, the safety apparatus includes an elongate member defining a longitudinal axis and at least two arms projecting away from the longitudinal axis of the elongate member. In use, in a first orientation, the elongate member is configured to be connected to a tool apparatus for applying a load energy to the tension stud and the at least two arms of the safety apparatus are configured to overlap with at least part of the tool apparatus in the direction of the longitudinal axis of the elongate member to contain the release of energy therebetween.

Abstract: Compressor rotor structure for turbomachinery, such as a compressor, is provided. Disclosed embodiments can benefit from sealing sleeves that may be arranged to inhibit passage onto respective hirth couplings of process fluid being processed by the compressor. The sealing sleeves may be affixed to adjoining structures (e.g., adjoining impeller bodies) by way of a slip fit connection to one of the adjoining structures and an interference fit connection with respect to the other adjoining structure, which is conducive to a user-friendly assembly of the sealing sleeves with the adjoining structures.

Abstract: A method and a calculation unit for calculating a load skewness result for a determination of service intervals for a turbine, includes: receiving a continuously measured load signal over time, indicating a load of the turbine during operation thereof; determining a load percentage signal over time as a deviation of the received measured load signal from a maximum capacity signal, wherein the maximum capacity signal represents a maximal possible load to be generated at a given time and is calculated from continuously measured sensor signals, representing operating parameters of turbine operation; calculating a load percentage distribution based on the determined load percentage signal; calculating a load skewness factor as a measure of an asymmetry of the calculated load percentage distribution; providing the load skewness result, including the calculated load percentage distribution and the calculated load skewness factor.

Abstract: A rotor assembly, especially for a gas turbine, includes at least a first rotor disc and a second rotor disc, the two rotor discs are arranged directly next to each other. The first rotor disc has a center through hole and the second rotor disc has no center through hole but a rotor disc center. A flow restrictor assembly which restricts the effective flow cross section of the center through hole of the first disc is used to control or to adjust the cooling air through gaps of a form-fitting torque transmitting device.

Abstract: A switching device for a high-voltage circuit breaker includes at least two switches for ascertaining states of apparatuses of the switching device via a monitoring system. The at least two switches are connected together in series and/or in parallel and can be connected together to exactly one input of the monitoring system. A high-voltage circuit breaker includes the switching device and the monitoring system, which is and/or includes a data acquisition, data processing, data storage and/or data transmission unit, in particular with digital-analog and/or analog-digital converters. A method for operating the switching device provides the at least two switches connected in series and/or in parallel, and forwards the state of the apparatuses via an input, in particular via exactly one input of the monitoring system, in the form of electric variables, in particular a voltage.

Abstract: A switching device for opening a current path of a direct-voltage network, which current path has source-side and load-side inductors, the switching device includes at least two switching modules, which are connected in series, each of the switching modules having at least one controllable semiconductor switching element, in parallel with which a series circuit of a resistor and a capacitor is connected. During operation of the switching device in order to open the current path, the controllable semiconductor switching element of at least one of the switching modules is switched into a conductive state with a duty cycle until the energy stored in the inductors has been dissipated, the duty cycle being dependent on the difference between the actual voltage and a target voltage across the semiconductor switching element, the target voltage being calculated at least from the system voltage of the direct-voltage network and the number of switching modules.

Abstract: A modular multilevel converter includes a plurality of submodules, each having at least two electronic switching elements, an electric energy store, two submodule connections, a bypass switch bridging the submodule, and a communication element communicating with a communication apparatus. A method for operating the modular multilevel converter includes ascertaining that the submodules have a defective submodule so that the communication element in the defective submodule does not communicate with the communication apparatus, determining whether a present arm current resulting from an operating point of the modular multilevel converter is below a predetermined threshold value, and generating or amplifying a converter-internal circular current with the defective submodule if the arm current resulting from the operating point is below the predetermined threshold value. A modular multilevel converter is also provided.

Abstract: A method for upgrading a gas turbine, the method includes: a) removing all guide vanes of the first guide vane stage; b) replacing the removed guide vanes of the first guide vane stage with new or reconditioned guide vanes, wherein blade platforms of the new or reconditioned guide vanes are provided with cooling air bores which fluidically connect a cooling air supply duct to the annular gap and open into the annular gap, and wherein the cooling air bores are arranged in such a manner that more cooling air bores open into regions of an annular gap that are arranged radially inwards from leading edges of the guide vanes than in other regions of the annular gap.

Abstract: A blocking element for a rotor head winding of a turbogenerator has a form which is adapted to the contour of the adjacent conductor of the rotor head winding. A depression extending in the axial direction is made in the side of the blocking element facing the conductor, which depression forms a serpentine channel for a cooling fluid from an inlet port on the small radius to a discharge port on the highest radius, with the discharge port communicating with a ventilation bore of the rotor cap enclosing the rotor winding head. An improved cooling effect with a reduced flow of cooling fluid and an increase in the efficiency of the turbogenerator as a whole results.

Abstract: A device for connecting to a high-voltage grid carrying an AC voltage and having a plurality of phases, includes an active part having at least one phase connection for connecting to a phase of the high-voltage grid, at least one step winding connected downstream of one of the phase connections and having a plurality of taps, a tap changer having, for each step winding, a selector for currentlessly switching over from a current to a desired tap of the step winding, and a load changeover switch connected downstream of the selector in series for commutating the current from the current to the desired tap, for avoiding a high short-circuit current in the step winding or in the tap changer. An impedance unit, having an impedance to be switched between a low impedance and a high impedance, is disposed between each selector and each load changeover switch.

Abstract: A turbine blade in a gas turbine engine includes an airfoil extending in a radial direction. The airfoil has an outer wall delimiting an airfoil interior. The outer wall includes a pressure sidewall and a suction sidewall joined at a leading edge and a trailing edge in a longitudinal direction. A turbulator is disposed in the airfoil interior. The turbulator includes a first row having at least two turbulator ribs spaced apart in the longitudinal direction. The turbulator includes a second row extending in the radial direction from the first row and having at least two turbulator ribs spaced apart in the longitudinal direction.

Abstract: A device and method for determining the purity of hydrogen, includes a measurement fuel cell cascade having at least one measurement fuel cell, a hydrogen inlet and a hydrogen outlet, a cell voltage monitoring unit that is electrically connected to the measurement fuel cell stack and monitors a voltage output of the measurement fuel cell stack, and a valve located downstream of the measurement fuel cell cascade in the direction of flow of the hydrogen for allowing dead-end operation of the measurement fuel cell cascade. The device for determining the purity of hydrogen further includes an evaluation unit that is connected to the cell voltage monitoring unit and receives a signal corresponding to a voltage output of the measurement fuel cell cascade from the cell voltage monitoring unit as a function of time, wherein the evaluation unit is designed to determine the purity of the hydrogen from the received signal.

Abstract: A coating composition for coating of components of a flow machine, especially a turbomachine such as a gas turbine with compressor, or of a compressor, which are exposed to the fluid stream of the flow machine or of the compressor, wherein the coating composition includes anticorrosion pigments, wherein the coating composition includes hard material particles, and wherein the coating composition is an RT-curing, UV-curing and/or thermally curing coating composition. A component of a flow machine or of a compressor has the coating composition. A method of maintaining a flow machine or a compressor uses the coating composition.

Abstract: A production method for a component having integrated channels for internal fluid guidance, having a first region, which is connected to a second region, and wherein the channels extend both through the first region and through the second region. The geometry of the component is modified to the technological characteristics of both production methods. The first region is produced by a method for casting using lost models without undercuts, and proceeding from the first region, the second region is built up using an additive manufacturing method.

Abstract: An annular resonator with a multiplicity of perforations for installation into a combustor arrangement of a static gas turbine installation, wherein the resonator is produced from refractory ceramic. A combustor arrangement for a gas turbine installation with a combustor unit, has a combustor, with a transfer line, which is arranged downstream of the combustor unit and which is designed to conduct hot gas generated by the combustor to a turbine, and with at least one resonator.

Abstract: A system includes a combustion power plant for generating power and an electrolysis unit for producing hydrogen. The combustion power plant has a combustion chamber for combustion of a fuel and an offgas conduit for leading off hot offgases formed in the combustion of the fuel. The offgas conduit is thermally coupled to the electrolysis unit. A method for operating the system includes burning the fuel in the combustion power plant, forming the hot offgases in the combustion of the fuel, removing the hot offgases through the offgas conduit, feeding the thermal energy of the hot offgases from the offgas conduit to the electrolysis unit, and producing hydrogen in the electrolysis unit by using the thermal energy from the hot offgases.