Abstract: A power transformer, including a core and a winding is provided. The core includes a limb and a yoke. The winding is wound around the limb and has an extension along a main axis of the limb. The power transformer further includes an energy harvesting device coupled to at least one of the core or the winding. The energy harvesting device includes a ferromagnetic part and a coil wound around at least a portion of the ferromagnetic part. The energy harvesting device is arranged in such a way that a part of a magnetic flux MF generated in the power transformer induces an electromotive force in the energy harvesting device. The coil includes a wire wound around a main axis of the coil and has an extension along the main axis of the coil.

Abstract: The present disclosure relates to a transformer system comprising a power transformer including a metal tank filled with an electrically insulating liquid, and a wireless sensor arrangement submerged in the insulating liquid within the tank. The sensor arrangement includes a radio transmitter for wirelessly transmitting sensor readings to the outside of the transformer through an opening in the tank, said opening being provided with a liquid-tight seal comprising a solid insulator for preventing leakage from the tank of the insulating liquid and wherein the radio transmitter is configured for transmitting the sensor readings using a carrier frequency within the range of from 100 kHz to 1 MHz.

Abstract: The present disclosure relates to a high voltage, HV, electrical device comprising a sensor arrangement including a sensor configured to measure a property of the electrical device, a detector configured to receive signals from the sensor, an electrical power source, and a resonator array including an array of LC circuits arranged equidistantly from each other along a transfer path, such as an axis, between the sensor and the detector and configured to wirelessly transfer power to the sensor from the electrical power source and to wirelessly transfer the sensor signals from the sensor to the detector.

Abstract: An electromagnetic induction device including a magnetic core having a limb which has a first end and a second end, windings arranged around the limb, and a housing including magnetic material, which housing defines a space in which the magnetic core and the windings are arranged, wherein the housing defines a return path for the primary magnetic flux, enabling primary magnetic flux from the first end of the limb to flow via the housing to the second end of the limb.

Abstract: An electromagnetic induction device including a magnetic core having a limb which has a first end and a second end, windings arranged around the limb, and a housing including magnetic material, which housing defines a space in which the magnetic core and the windings are arranged, wherein the housing defines a return path for the primary magnetic flux, enabling primary magnetic flux from the first end of the limb to flow via the housing to the second end of the limb.

Abstract: The invention relates to power networks, and in particular to a battery energy source arrangement and voltage source converter system in such network. The battery energy source arrangement includes battery energy storage, having one or more parallel-connected battery strings and a mechanism for connecting a voltage of the battery strings to a load. The battery energy source arrangement further includes battery string voltage adapter devices connected in series with respective ones of the one or more battery strings wherein the battery string voltage adapter devices are designed to handle only a fraction of the voltage handled by the battery strings.

Abstract: A power compensator for an electric power transmission line. The power compensator includes a voltage source converter, a capacitor and an energy storage device. The energy storage device includes a high voltage battery having a short circuit failure mode, a first main switch and second main switch for disconnecting the battery from the capacitor, and a control unit for operating the first and second switch.

Abstract: A generator device for converting thermal energy to electric energy. A magnetic circuit includes at least a portion made of a magnetic material. A temperature-varying device varies the temperature in the portion made of the magnetic material alternately above and below a phase transition temperature of the magnetic material to thereby vary the reluctance of the magnetic circuit. A coil is arranged around the magnetic circuit, in which electric energy is induced in response to a varying magnetic flux in the magnetic circuit. A magnetic flux generator generates magnetic flux in the magnetic circuit. A controllable electric circuit device is connected to the coil and a control device controls the controllable electric circuit device.

Abstract: A battery unit arrangement for high voltage applications. The battery unit arrangement includes a battery unit having a battery chassis, and a switching device. The switching device includes switching mechanism for switching the battery chassis between two positions, a first position connecting the battery chassis to a pole of the battery uniti and a second position connecting the battery chassis to a zero potential. The invention also relates to a connection and disconnection arrangement and methods for operating such connection and disconnection arrangement.

Abstract: A device for transforming thermal energy to electric energy including a magnetic circuit including at least a portion made of a magnetic material, a temperature-varying device for varying the temperature in the portion made of the magnetic material alternately above and below a phase transition temperature of the magnetic material to thereby vary the reluctance of the magnetic circuit, and a coil arranged around the magnetic circuit, in which electric energy is induced in response to a varying magnetic flux in the magnetic circuit. A capacitor is connected in parallel with the coil to thereby form a resonant circuit, wherein the resonance frequency of the resonant circuit and the frequency of the temperature variation above and below the phase transition temperature of the magnetic material are dependent on one another to optimize the electric power output.

Abstract: A rotating valve apparatus includes a cylindrical casing; a shaft arranged symmetrically in the casing; a member fixedly attached to the shaft and in close fit with the cylindrical casing, defining separated chambers within the casing; at least one outlet fixedly arranged along the circumference of the casing; and a plurality of axially arranged inlets, each of which being constantly in fluid communication with a respective one of the separated chambers, wherein the axially arranged inlets are alternately in fluid connection with the outlet fixedly arranged along the circumference of the casing in response to rotation of the shaft and the member with respect to the casing. The outlet(s) has/have a fluid path length that varies along the circumference of the casing depending on the rotational speed of the shaft such that the interfaces between fluids originating from different ones of the axially arranged inlets will be essentially vertical to the flow direction of the fluids.

Abstract: A device for controlling a magnetic flux in an electromagnetic system, wherein the system includes magnetically connected magnetic cores, between which a volume is arranged. The volume includes a controllable magnetic flux region and the magnetic flux region includes a magnetic material having a relative permeability that may be varied by influencing the temperature of the material. The magnetic material includes a magnetic material, the Curie point of which lies within the temperature operating range of the device and exhibits paramagnetic properties within the temperature range. Also a method of controlling a magnetic flux.

Abstract: A generator device for converting thermal energy to electric energy. A magnetic circuit includes at least a portion made of a magnetic material. A temperature-varying device varied the temperature in the portion made of the magnetic material alternately above and below a phase transition temperature of the magnetic material to thereby vary the reluctance of the magnetic circuit. A coil is arranged around the magnetic circuit, in which electric energy is induced in response to a varying magnetic flux in the magnetic circuit. A magnetic flux generator creates magnetic flux in the magnetic circuit. The temperature-varying device alternately passes hot and cold fluid by, or through holes in, the portion made of the magnetic material of the magnetic circuit in a single direction to thereby vary the temperature in the portion made of the magnetic material alternately above and below the phase transition temperature of the magnetic material.

Abstract: An electricity generation system having a low frequency alternating heat and cold distribution system provided for alternately distributing heat and cold at low frequency; a heat-electricity conversion system operatively connected to the low frequency alternating heat and cold distribution system and provided for generating electricity in response to the alternately distributed heat and cold; an electric power delivery system operatively connected to the heat-electricity conversion system and provided for distributing the generated electricity; and a process control system operatively connected to the low frequency alternating heat and cold distribution system, to the heat-electricity conversion system, and to the electric power delivery system in order to control the operations thereof, is provided.

Abstract: A battery unit arrangement for high voltage applications. The battery unit arrangement includes a battery unit having a battery chassis, and a switching device. The switching device includes switching mechanism for switching the battery chassis between two positions, a first position connecting the battery chassis to a pole of the battery uniti and a second position connecting the battery chassis to a zero potential. The invention also relates to a connection and disconnection arrangement and methods for operating such connection and disconnection arrangement.

Abstract: A rotating valve apparatus includes a cylindrical casing; a shaft arranged symmetrically in the casing; a member fixedly attached to the shaft and in close fit with the cylindrical casing, defining separated chambers within the casing; at least one outlet fixedly arranged along the circumference of the casing; and a plurality of axially arranged inlets, each of which being constantly in fluid communication with a respective one of the separated chambers, wherein the axially arranged inlets are alternately in fluid connection with the outlet fixedly arranged along the circumference of the casing in response to rotation of the shaft and the member with respect to the casing. The outlet(s) has/have a fluid path length that varies along the circumference of the casing depending on the rotational speed of the shaft such that the interfaces between fluids originating from different ones of the axially arranged inlets will be essentially vertical to the flow direction of the fluids.

Abstract: The invention relates to power networks, and in particular to a battery energy source arrangement and voltage source converter system in such network. The battery energy source arrangement includes battery energy storage, having one or more parallel-connected battery strings and a mechanism for connecting a voltage of the battery strings to a load. The battery energy source arrangement further includes battery string voltage adapter devices connected in series with respective ones of the one or more battery strings wherein the battery string voltage adapter devices are designed to handle only a fraction of the voltage handled by the battery strings.

Abstract: A heat exchanger device includes a body and at least one channel located in the body, through which a heat exchange fluid is adapted to be guided, thereby providing heat transfer per unit area between the heat exchange fluid and the material of the body, wherein the body has a material composition and/or dimensions such that the amount of heat transfer per unit area between the heat exchange fluid and the material of the body is essentially constant along the direction of the channel.

Abstract: A generator device for converting thermal energy to electric energy. A magnetic circuit includes at least a portion made of a magnetic material. A temperature-varying device varied the temperature in the portion made of the magnetic material alternately above and below a phase transition temperature of the magnetic material to thereby vary the reluctance of the magnetic circuit. A coil is arranged around the magnetic circuit, in which electric energy is induced in response to a varying magnetic flux in the magnetic circuit. A magnetic flux generator creates magnetic flux in the magnetic circuit. The temperature-varying device alternately passes hot and cold fluid by, or through holes in, the portion made of the magnetic material of the magnetic circuit in a single direction to thereby vary the temperature in the portion made of the magnetic material alternately above and below the phase transition temperature of the magnetic material.

Abstract: A device for controlling a magnetic flux in an electromagnetic system, wherein the system includes magnetically connected magnetic cores, between which a volume is arranged. The volume includes a controllable magnetic flux region and the magnetic flux region includes a magnetic material having a relative permeability that may be varied by influencing the temperature of the material. The magnetic material includes a magnetic material, the Curie point of which lies within the temperature operating range of the device and exhibits paramagnetic properties within the temperature range. Also a method of controlling a magnetic flux.