Abstract: A radiator for cooling a transformer, preferably a power transformer, or a choke, includes a plurality of plate-shaped radiator elements which are disposed parallel to one another and through which a coolant can flow in parallel. At least one elastically deformable element is provided at least between two adjacent radiator elements and is constructed in such a way that it counteracts an expansion of the radiator elements perpendicular to the surface of the radiator elements. Plastic deformation of the walls of the radiator elements can be prevented by the elastically deformable elements. A unit including a transformer or a choke and a method for producing a radiator are also provided.

Abstract: A method identifies asymmetrical vibrations during the operation of an electric device which is connected to a high-voltage grid. Vibrations of the electric device are detected using vibration sensors which provide measured values on the output side. The measured values and/or values derived from the measured values are transmitted to a communication unit via a close-range communication connection. The measured values and/or the values are transmitted by the communication unit to a data processing cloud via a far-range communication connection. The measured values are separated into frequency components by the data processing cloud using a Fourier transformation, thereby obtaining a frequency spectrum. Odd and even frequency components of the frequency spectrum are ascertained based on a base frequency of the high-voltage supply grid and put into a ratio R relative to one another. The presence of asymmetrical vibrations is indicated if the ratio R exceeds a specified threshold.

Abstract: A radiator for cooling a transformer, preferably a power transformer, or a choke, includes a plurality of plate-shaped radiator elements which are disposed parallel to one another and through which a coolant can flow in parallel. At least one elastically deformable element is provided at least between two adjacent radiator elements and is constructed in such a way that it counteracts an expansion of the radiator elements perpendicular to the surface of the radiator elements. Plastic deformation of the walls of the radiator elements can be prevented by the elastically deformable elements. A unit including a transformer or a choke and a method for producing a radiator are also provided.

Abstract: Measuring arrangement for detecting a magnetic unidirectional flux in the core of a transformer, wherein a sensor, formed from a ferromagnetic sensor core which is surrounded by a sensor coil, is arranged in a section of a core limb in a cooking channel, where the section is predefined by the width of the winding, or is arranged in an annular space, formed from an outer peripheral surface of the core limb and an inner peripheral surface of an associated transformer winding, such that a magnetic partial flux is diverted by the core limb and guided over at least one non-ferromagnetic gap.

Abstract: A circuit arrangement for reducing a magnetic unidirectional flux component in a core of a transformer includes a measuring device that provides a sensor signal corresponding to the magnetic unidirectional flux component, a compensation coil magnetically coupled to the core of the transformer, and a semiconductor switching device which is electrically arranged in a current path in series with the compensation coil to feed a current into the compensation coil, such that current is directed opposite the unidirectional flux component, where the semiconductor switching device is controlled via a control signal provided by a controller, and includes an inductive voltage divider having a first impedance component arranged in a current circuit in series with the compensation coil and the semiconductor switching device and a second impedance component arranged in parallel with the semiconductor switching device, where the first impedance component is connected in parallel with a parallel resonant circuit.

Abstract: An apparatus for reducing a magnetic unidirectional flux component in the core of a transformer with at least three legs, in particular a three-phase transformer having at least one compensation winding per transformer leg, wherein the compensation windings are magnetically coupled to the core of the transformer, where two compensation windings are provided per leg, the first compensation windings of a leg are each electrically connected together in a first delta connection, in each case the second compensation windings of a leg are each electrically connected together in a second delta connection, the compensation windings of at least one leg have different numbers of windings, and where at least one switching unit is arranged in series with the compensation windings for phase angle control.

Abstract: A device for reducing a magnetic unidirectional flux component in the core of a three-phase transformer includes at least one compensation winding, which is magnetically coupled to the core of the three-phase transformer, a switch arranged electrically in a current path in series with the at least one compensation winding to feed current into the winding, where the effect of the current is directed opposite to the unidirectional flux component, and an apparatus for limiting current arranged electrically in a current path in series with the at least one compensation winding, and where two compensation windings are provided on different legs of the core of the three-phase transformer such that a greater reduction of the magnetic unidirectional flux component is achieved.

Abstract: An arrangement for reducing a magnetic unidirectional flux component in the core of a transformer includes a measurement apparatus which provides a measurement signal corresponding to the magnetic unidirectional flux component, a compensation winding magnetically coupled to the core of the transformer, wherein magnetic flux flowing in the core induces a voltage in the compensation winding, a switch device arranged electrically in series together with the compensation winding in a current path, a control device which controls the switch device via a control parameter, where the switch unit comprises a magnetic core and a winding arrangement which is magnetically coupled to the magnetic core, and the control parameter is supplied to the winding arrangement such that the magnetic saturation state of the core is variable, whereby the conductive state of the switch unit can be produced.

Abstract: An apparatus for reducing a magnetic unidirectional flux component in the core of a transformer, i.e., a three-phase transformer, includes a plurality of compensation windings that are magnetically coupled to the core of the transformer, wherein a controllable current source for feeding current into the compensation windings is arranged electrically in series with the compensation windings, specifically with the neutral point thereof, which is forming by the inputs of the compensation windings, and a neutral earthing transformer is electrically connected to the outputs of the compensation windings, where the current source electrically interconnects the neutral point of the compensation windings and the neutral point of the neutral earthing transformer.

Abstract: A device for reducing a magnetic unidirectional flux component in the core of a transformer includes at least one compensation winding, which is magnetically coupled to the core of the transformer, at least one switching unit in series with the compensation winding to feed a current into the compensation winding, and at least one current-limiting reactor in series with the compensation winding, wherein two switching units are connected in parallel with each other per current-limiting reactor and the current-limiting reactor comprises two windings, which can be connected either in series or in parallel with each other, in order to reduce the number of current-limiting reactors in comparison with conventional cascaded circuits.

Abstract: A circuit arrangement for compensation of a DC component in a transformer, wherein the transformer includes a winding arrangement connected via connecting lines to a power system for transporting electrical energy, and includes a neutral point connected to earth, where the circuit arrangement includes a transductor circuit arranged in a current path that connects a connection point situated on a node-free portion of the connection line to earth, a control and regulation device that controls the transductor circuit via a control signal and to which is fed, on the input side, a signal provided by a detection device with respect to a size and direction of the DC component to be compensated.

Abstract: A system for compensating one or more DC components in an electrical system includes one or more sensors for sensing the one or more DC components. The system also includes one or more DC component controllers for generating one or more reference signals from one or more signals received from the one or more sensors. In addition to this, the system also has one or more controllers for generating one or more firing pulses from the one or more reference signals received from the one or more DC component controllers and one or more valve configurations for charging one or more controllable branches to counterbalance the one or more DC components of the electrical system. A method for compensating one or more DC components in an electrical system is also provided.

Abstract: A circuit arrangement for reducing unidirectional flux component in a transformer core includes a compensation winding magnetically coupled to the transformer core, a transductor series connected with the compensation winding in a compensation current path, wherein the compensation current path has two parallel branches each containing a power winding of the transductor and an uncontrolled valve connected in series, where flow directions of the valves run counter to one another, and where each power winding is magnetically coupled to a control winding via a saturable transductor core, and includes a controller to which a detector supplies magnitude and direction information of the unidirectional flux component, and which generates a control variable supplied to each control winding such that the saturation state of the transductor core is variable such that a compensation current is formed in the compensation current path that counteracts the unidirectional flux component in the transformer core.

Abstract: A circuit arrangement for reducing a magnetic unidirectional flux component in a core of a transformer includes a measuring device that provides a sensor signal corresponding to the magnetic unidirectional flux component, a compensation coil magnetically coupled to the core of the transformer, and a semiconductor switching device which is electrically arranged in a current path in series with the compensation coil to feed a current into the compensation coil, such that current is directed opposite the unidirectional flux component, where the semiconductor switching device is controlled via a control signal provided by a controller, and includes an inductive voltage divider having a first impedance component arranged in a current circuit in series with the compensation coil and the semiconductor switching device and a second impedance component arranged in parallel with the semiconductor switching device, where the first impedance component is connected in parallel with a parallel resonant circuit.

Abstract: An arrangement for reducing a magnetic unidirectional flux component in the core of a transformer includes a measurement apparatus which provides a measurement signal corresponding to the magnetic unidirectional flux component, a compensation winding magnetically coupled to the core of the transformer, wherein magnetic flux flowing in the core induces a voltage in the compensation winding, a switch device arranged electrically in series together with the compensation winding in a current path, a control device which controls the switch device via a control parameter, where the switch unit comprises a magnetic core and a winding arrangement which is magnetically coupled to the magnetic core, and the control parameter is supplied to the winding arrangement such that the magnetic saturation state of the core is variable, whereby the conductive state of the switch unit can be produced.

Abstract: An apparatus for reducing a magnetic unidirectional flux component in the core of a transformer with at least three legs, in particular a three-phase transformer having at least one compensation winding per transformer leg, wherein the compensation windings are magnetically coupled to the core of the transformer, where two compensation windings are provided per leg, the first compensation windings of a leg are each electrically connected together in a first delta connection, in each case the second compensation windings of a leg are each electrically connected together in a second delta connection, the compensation windings of at least one leg have different numbers of windings, and where at least one switching unit is arranged in series with the compensation windings for phase angle control.

Abstract: A circuit arrangement for reducing unidirectional flux component in a transformer core includes a compensation winding magnetically coupled to the transformer core, a transductor series connected with the compensation winding in a compensation current path, wherein the compensation current path has two parallel branches each containing a power winding of the transductor and an uncontrolled valve connected in series, where flow directions of the valves run counter to one another, and where each power winding is magnetically coupled to a control winding via a saturatable transductor core, and includes a controller to which a detector supplies magnitude and direction information of the unidirectional flux component, and which generates a control variable supplied to each control winding such that the saturation state of the transductor core is variable such that a compensation current is formed in the compensation current path that counteracts the unidirectional flux component in the transformer core.

Abstract: A circuit arrangement for compensation of a DC component in a transformer, wherein the transformer includes a winding arrangement connected via connecting lines to a power system for transporting electrical energy, and includes a neutral point connected to earth, where the circuit arrangement includes a transductor circuit arranged in a current path that connects a connection point situated on a node-free portion of the connection line to earth, a control and regulation device that controls the transductor circuit via a control signal and to which is fed, on the input side, a signal provided by a detection device with respect to a size and direction of the DC component to be compensated.

Abstract: A device for reducing a magnetic unidirectional flux component in the core of a three-phase transformer includes at least one compensation winding, which is magnetically coupled to the core of the three-phase transformer, a switch arranged electrically in a current path in series with the at least one compensation winding to feed current into the winding, where the effect of the current is directed opposite to the unidirectional flux component, and an apparatus for limiting current arranged electrically in a current path in series with the at least one compensation winding, and where two compensation windings are provided on different legs of the core of the three-phase transformer such that a greater reduction of the magnetic unidirectional flux component is achieved.

Abstract: A protective device for a transformer which is connected on the high-voltage side via supply lines to a network for transmission and distribution of electrical energy, wherein the transformer includes a neutral grounding, where each supply line is connected to ground via a grounding transformer , and where the grounding transformer includes a neutral point resistance which is lower than the neutral point resistance of the neutral grounding, such that Geomagnetically Induced Current flowing on the supply lines is diverted to ground.