Abstract: A method and device are disclosed for synchronizing an inverter with an alternating voltage source. The method includes measuring a current generated by the alternating voltage source and flowing through diodes of the inverter, determining a phase angle and angular velocity relating to the alternating voltage source from the measured current for enabling synchronization between the inverter and the alternating voltage source, and starting modulation of the inverter according to the obtained phase angle and angular velocity.

Abstract: It is presented a converter arm for power conversion. The converter arm comprises: a plurality of converter cells, wherein each converter cell comprises a plurality of semiconductor switches, an energy storage element and at least three control signal connections arranged to control the conducting state of the plurality of semiconductor switches. Each converter cell is connected to receive a control signal from at least three entities via said control signal connections, wherein at least two of the three entities are neighboring converter cells, and each converter cell is arranged to forward a control signal to all connected neighboring converter cells via said control signal connections. A corresponding converter device is also presented.

Abstract: A highly accurate fault location method for series-compensated double-circuit transmission lines having series compensation devices and metal oxide varistors (SC&MOV) at first and second terminal ends is provided. Synchronized or unsynchronized current phasors and local voltage phasors are used as input to the fault location method. The voltages and currents at the fault point are formulated as a function of the unknown fault location. Boundary conditions for the particular IED-determined fault type are used to derive the fault location formulas.

Abstract: The present invention relates to a robot teach pendant unit (2) coupled to a programmable robot controller (1), the teach pendant comprising a graphical screen (6), and a native user interface program (9) which creates a graphical user interface and displays the user interface on the graphical screen.

Abstract: A protection arrangement for inaccessibly located power distribution equipment includes a first enclosure with power equipment and sensors, a second enclosure adjacent the first enclosure and including a signal handling device, at least one sealed electrical conductor passage between the first and second enclosures, each comprising at least one penetrator through the walls of the first and second enclosures. The signal handling device in the second enclosure is connected to the sensors in the first enclosure via electrical conductors passing through said sealed electrical conductor passages and to an external protection device via a communication link. The signal handling device receives electrical sensor signals from the sensors and shapes them for submission to the external protection device.

Abstract: Exemplary embodiments are directed to an equipment space that is a closed space provided with electrical equipment and an air dryer condensing the moisture of the air in the equipment space into water. A system for removing water from the equipment space includes a porous element having a capillary structure and being located in an outlet opening of the equipment space. The porous element is connected such that water condensed by the air dryer is directed to a first inner surface of the porous element. The capillary structure of the porous element is configured to propogate water from the inner surface of the porous element to an outer surface of the porous element. The outer surface of the porous element is configured to release water to ambient air outside the equipment space.

Abstract: A circuit breaking arrangement is disclosed, which is adapted to be coupled to a transmission line arranged to carry direct current for controllably effecting discontinuation of flow of direct current in the transmission line. The circuit breaking arrangement includes a current interrupter unit adapted to, when actuated, interrupt current in the transmission line and a first resonance circuit and at least a second resonance circuit. Each of the first and the at least a second resonance circuit is adapted to, upon actuation of the current interrupter unit and when the respective resonance circuit is activated, generate a resonance current superposing current of any arc generated in the current interrupter unit after actuation thereof.

Abstract: An arrangement for tapping power from a DC power line to an AC power line includes power transfer modules between two DC potentials, each including a first branch with a string of converter cells in parallel with a second branch including a capacitor and being connected to an AC phase. There is at least one control unit that controls the arrangement considering one or more of a) distributing appropriate AC and DC voltages in converter output voltages of all series connected modules, b) maintaining/setting cell capacitor voltages in specific range and allowing boost mode operation, c) performing possible balancing of the introduced capacitor and d) employing an alternate approach of using passive filters to mitigate low order harmonics.

Abstract: An assembly method is provided by orienting a cylinder-head at a first orientation. A first plurality of spring caps and a first plurality of retainer keys are installed into the cylinder-head in the first orientation by a first robot. A first plurality of valves is installed into the cylinder-head in the first orientation by a second robot, into engagement with the first plurality of retainer keys. An end effector is provided with an actuator supported upon an adapter plate. A shaft extends from the actuator with a mating surface to engage a spring cap. Porting is provided through the shaft to convey pressurized air upon a plurality of retainer keys within the spring cap. A plurality of gripper fingers extend from the distal end of the shaft to grip a valve spring while retaining a spring cap between the valve spring and the mating surface of the shaft.

Abstract: There is provided an electronics module. The electronics module includes a circuit board. The circuit board includes electronic equipment. The electronics module includes a housing. The housing encloses the circuit board. The electronics module includes a thermally conductive panel. The thermally conductive panel at least partly covers at least two opposite side surfaces of the housing. There is also provided an arrangement including at least two such electronics modules. There is also provided a method for providing such an electronics module.

Abstract: A short-circuiting arrangement for capacitors of a high voltage converter are provided, the capacitors each having two connection terminals, the arrangement including a short-circuiting wire configured to be moved along while in sliding contact with the connection terminals and including a short-circuiting section with electrically conductive material connected to a ground potential and a probing section with electrically conductive material and a voltage evaluating unit electrically connected to the short-circuit section and the probing section and configured to detect, as the probing section and short-circuiting section are connected to the respective connection terminals, the voltage across the capacitor, compare the voltage with a discharge threshold and halt or move the short-circuiting wire based on the detected voltage.

Abstract: A monitoring device for determining the concentration of a dielectric insulation fluid such as a perfluoroketones in a room housing at least one high-voltage electrical apparatus and being accessible by humans essentially without modifying the room conditions, for example the room being a part of an air-insulated substation, with the monitoring system including one or more sensors for determining an emission and/or absorption of the dielectric insulation fluid molecules at at least one wavelength or wavelength band of the electromagnetic wave spectrum.

Abstract: Systems, methods and apparatuses for estimating a location within an area are disclosed. One method includes determining a plurality of wireless signal signatures at a plurality of locations within the area, wherein each wireless signal signatures includes a characteristic of a plurality of wireless links between a device and a plurality of network access points at a one of the plurality of locations, wherein the plurality of wireless signal signatures are received by a network manager server. Further, the network manager server receives a present wireless signal signature of a current device. The method further includes estimating locations the current device, including comparing a present wireless signal signature of the current device with plurality of wireless signal signatures, and adaptively re-determining the plurality of wireless signal signatures based on at least one condition of a distributed wireless network that includes the plurality of network access points.

Abstract: A tool for extracting armour wires from a cable having an armouring layer includes a curved beak for grasping an armour wire, and an elongated body having a bottom surface provided with a protruding tip for separating two neighboring armour wires. The tip is protrudes away from the bottom surface and is elongated in a direction parallel to the bottom surface.