Abstract: A mobile tester is provided for “Very Low Frequency” (VLF) testing of a measurement object, which has means for generating an AC voltage which has an effective amplitude of greater than or equal to 1 kV and a frequency in the range of between 0.01 and 1 Hz, a connection element for connecting the measurement object, and means for measuring and evaluating the test voltage applied to the measurement object and the test current caused thereby. In a first operating mode, the tester autonomously carries out a VLF test using the test voltage generated. The tester also has a communication interface for emitting a synchronization signal or for receiving an externally generated synchronization signal, and the tester is set up, in a second operating mode, to synchronize the generated test voltage with the test voltage generated by at least one further tester of the same type.

Abstract: A high-powered, high-voltage test device for generating a test voltage, wherein the test voltage is an alternating voltage having an amplitude of at least 100 kV at a power of greater than 1 kW, wherein the device has at least two voltage amplifier branches, of which a first voltage amplifier branch contributes to generating the positive voltage half-cycles of the test voltage and a second voltage amplifier branch contributes to generating the negative voltage half-cycles of the test voltage. The high-voltage test device furthermore has a measurement circuit for measuring the test voltage to be applied to a measurement object and the test current consequently caused in the measurement object and is characterized in that each voltage amplifier branch is installed in a separate assembly having integrated active air cooling.

Abstract: A circuit assembly is provided for producing a test voltage for testing a test object, comprising two high voltage sources for producing a positive and negative high voltage of variable amplitude at respective outputs thereof and a high voltage switch assembly, which is arranged between the outputs of the two high voltage sources and the test object and which can be switched suitably in order to successively charge and discharge the test object, wherein furthermore a closed-loop controller is provided, which measures the present test voltage on the test object and acts on the high-voltage switch assembly in order to charge and discharge the test object in a defined manner in dependence on the measured test voltage.

Abstract: A high-powered, high-voltage test device is provided comprising means for generating a test voltage, wherein the test voltage is an alternating voltage having an amplitude of at least 100 kV at a power of greater than 1 kW. Said means for generating the test voltage have at least two voltage amplifier branches, of which a first voltage amplifier branch contributes to generating the positive voltage half-cycles of the test voltage and a second voltage amplifier branch contributes to generating the negative voltage half-cycles of the test voltage. The high-voltage test device furthermore has a measurement circuit for measuring the test voltage to be applied to a measurement object and the test current consequently caused in the measurement object and is characterized in that each voltage amplifier branch is installed in a separate assembly having integrated active air cooling.

Abstract: A mobile tester is provided for “Very Low Frequency” (VLF) testing of a measurement object, which has means for generating an AC voltage which has an effective amplitude of greater than or equal to 1 kV and a frequency in the range of between 0.01 and 1 Hz, a connection element for connecting the measurement object, and means for measuring and evaluating the test voltage applied to the measurement object and the test current caused thereby. In a first operating mode, the tester autonomously carries out a VLF test using the test voltage generated. The tester also has a communication interface for emitting a synchronization signal or for receiving an externally generated synchronization signal, and the tester is set up, in a second operating mode, to synchronize the generated test voltage with the test voltage generated by at least one further tester of the same type.

Abstract: A circuit assembly is provided for producing a test voltage for testing a test object, comprising two high voltage sources for producing a positive and negative high voltage of variable amplitude at respective outputs thereof and a high voltage switch assembly, which is arranged between the outputs of the two high voltage sources and the test object and which can be switched suitably in order to successively charge and discharge the test object, wherein furthermore a closed-loop controller is provided, which measures the present test voltage on the test object and acts on the high-voltage switch assembly in order to charge and discharge the test object in a defined manner in dependence on the measured test voltage.

Abstract: A high-voltage transformer for providing an alternating voltage in the kV range, comprising at least one secondary winding wound on a coil carrying body surrounding a transformer core, and an insulation housing encapsulating the secondary winding is provided to electrically insulate the secondary winding. Said insulation housing is walled by the coil carrying body carrying the secondary winding and by an enveloping body made of plastic and enveloping the secondary winding so that an annular gap is formed, wherein the annular gap between the secondary winding and the enveloping body is filled with an insulating fluid. The annular gap has a gap width of less than or equal to 20 mm viewed in the cross-section, and the enveloping body has a wall thickness of less than or equal to 20 mm, wherein the plastic is polypropylene, and a separate expansion volume is not provided for the insulating fluid.

Abstract: A turbine blade is presented including a vane that runs along a blade axis and a platform region, which is located at the root of the vane and has a platform that extends transversally to the blade axis. An improved cooling of a platform region and the transition region is provided from a turbine blade to a platform of a turbine blade. The platform includes a first platform wall that does not support the vane and a second platform wall that supports the vane. At the root of the vane and over the course of the transition region from the turbine blade to the platform, the first platform wall is aerodynamically curved and the course of the second platform wall has a receding shoulder in relation to the first platform wall, as a continuation of the vane.

Abstract: A device for diagnosing measurement objects using a measurement voltage comprises a housing, in which at least one electric measurement circuit is arranged for carrying out the diagnosis. To this end, the device is designed for the simultaneous diagnosis of a plurality of measurement objects using the same measurement voltage and comprises at least two separate connecting elements for connecting one measurement object each to the measurement voltage. The measurement circuit in turn comprises at least two current detection units and a voltage detection unit, by means of which the current flowing through each measurement object and the measurement voltages present at all measurement objects can be measured at the same time.

Abstract: The invention relates to an arrangement comprising at least one electronic component and a cooling body associated therewith. A support physically interposed between the electronic component and the cooling body and the support has at least one layer with at least one material of an electric strength of at least 10 kV/mm and a thermal conductivity of at least 5 W/mK. At least one recess and/or at least one protruding element is arranged in and/or on the layer of the support, and is configured in such a manner that it extends, along the surface of the layer of the support, through preferably all electrically possible pathways between the electronic component and the cooling body as compared to the condition of the layer of the support without the recess and/or without the protruding element.

Abstract: A high-voltage transformer for providing an alternating voltage in the kV range, comprising at least one secondary winding wound on a coil carrying body surrounding a transformer core, and an insulation housing encapsulating the secondary winding is provided to electrically insulate the secondary winding. Said insulation housing is walled by the coil carrying body carrying the secondary winding and by an enveloping body made of plastic and enveloping the secondary winding so that an annular gap is formed, wherein the annular gap between the secondary winding and the enveloping body is filled with an insulating fluid. The annular gap has a gap width of less than or equal to 20 mm viewed in the cross-section, and the enveloping body has a wall thickness of less than or equal to 20 mm, wherein the plastic is polypropylene, and a separate expansion volume is not provided for the insulating fluid.

Abstract: The invention relates to a turbine blade comprising a vane that runs along a blade axis and a platform region, located at the root of the vane having a platform that extends transversally to the blade axis. The aim of the invention is to configure a delimitation of a flow channel of a gas turbine in the simplest possible manner. Therefore, the platform is configured by an elastic sheet metal part that rests on the vane. Said part leads to a gas turbine comprising a flow conduit that runs along an axis of the gas turbine, said conduit having an annular cross-section for a working medium and a second vane stage that is situated downstream of a first vane stage, which runs along the axis.

Abstract: A device for measuring the loss factor and/or measuring the phase angle between a voltage and a current and/or recording a voltage decay and/or current decay and/or recording partial discharge processes and/or measuring the propagation time on test objects that are to be tested, includes a housing in which at least one measuring circuit is arranged for measuring and/or recording purposes. A terminal adapter (12) is provided on the housing (9) to connect the test object that is to be tested directly to the housing (9).

Abstract: A portable high-voltage test instrument comprises an electronic unit having means for producing a test voltage located in the kV range, a control area cooperating with the electronic unit, at least one terminal for the component or cable to be tested and for an external voltage supply, a housing for permanently accommodating the electronic unit and a cooling system, disposed inside the housing, for cooling the electronic unit, the cooling system comprising an air-cooled assembly having an air inlet and an air outlet. This housing is provided with a lid part that can be moved between an open and a closed position, such that all terminals, the control area and the air inlet and air outlet are covered in closed position thereof, whereas all terminals, the control area and the air inlet and air outlet are unobstructed in open position thereof.

Abstract: There is described a turbine blade of a gas turbine comprising a suction-side blade wall and a pressure-side blade wall that, in the trailing edge area, runs toward the suction-side blade wall. This suction-side blade wall has a trailing edge projection projecting over the end edge of the pressure-side blade wall at least in a partial section of the trailing edge area. A turbine blade of the aforementioned type is designed for a particularly long serviceable life while requiring little cooling air. To this end, the pressure-side surface of the trailing edge projection has a number of trough-shaped recesses that increase the transfer of heat from the trailing edge projection by a local swirling of the cooling air.

Abstract: A portable high-voltage test instrument comprises an electronic unit having means for producing a test voltage located in the kV range, a control area cooperating with the electronic unit, at least one terminal for the component or cable to be tested and for an external voltage supply, a housing for permanently accommodating the electronic unit and a cooling system, disposed inside the housing, for cooling the electronic unit, the cooling system comprising an air-cooled assembly having an air inlet and an air outlet. This housing is provided with a lid part that can be moved between an open and a closed position, such that all terminals, the control area and the air inlet and air outlet are covered in closed position thereof, whereas all terminals, the control area and the air inlet and air outlet are unobstructed in open position thereof.

Abstract: The invention relates to a turbine blade comprising a vane that runs along a blade axis and a platform region, located at the root of the vane having a platform that extends transversally to the blade axis. The aim of the invention is to configure a delimitation of a flow channel of a gas turbine in the simplest possible manner. Therefore, the platform is configured by an elastic sheet metal part that rests on the vane. Said part leads to a gas turbine comprising a flow conduit that runs along an axis of the gas turbine, said conduit having an annular cross-section for a working medium and a second vane stage that is situated downstream of a first vane stage, which runs along the axis.

Abstract: The invention relates to a turbine blade comprising a vane that runs along a blade axis and a platform region, which is located at the root of the vane having a platform that extends transversally to the blade axis. The aim of the invention is to configure a delimitation of a flow channel of a gas turbine in the simplest possible manner. Therefore, the platform is configured by an elastic sheet metal part that rests on the vane. Said part leads to a gas turbine comprising a flow conduit that runs along an axis of the gas turbine, said conduit having an annular cross-section for a working medium and a second vane stage that is situated downstream of a first vane stage, which runs along the axis.

Abstract: The invention relates to a turbine blade comprising a vane that runs along a blade axis and a platform region, which is located at the root of the vane and has a platform that extends transversally to the blade axis. The aim of the invention is to guarantee the improved cooling of a platform region and the transition region from a turbine blade to a platform of a turbine blade, thus ensuring the cooling of the delimitation of a flow channel in a gas turbine. To achieve this, the platform comprises a first platform wall that does not support the vane and a second platform wall that supports said vane. According to the inventive concept, at the root of the vane and over the course of the transition region from the turbine blade to the platform, said first platform wall is aerodynamically curved and the course of the second platform wall has a receding shoulder in relation to the first platform wall, as a continuation of the vane.

Abstract: The invention relates to an arrangement comprising at least one electronic component (1) and a cooling body (3) associated therewith and a support physically interposed between the electronic component (1) and the cooling body (3) and having at least one layer (2) with at least one material of an electric strength of at least 10 kV/mm and a thermal conductivity of at least 5 W/mK. At least one recess (5) and/or at least one protruding element is arranged in and/or on the layer (2) of the support and is configured in such a manner that it extends, along the surface of the layer (2) of the support, preferably all electrically possible pathways between the electronic component (1) and the cooling body as compared to the condition of the layer (2) of the support without the recess (5) and/or without the protruding element.