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: A method for multicore processor fault detection during execution of safety critical software applications in a multicore processor environment involves dedicating the complete resources of at least a part of at least one processor core to execution of diagnostics software application whilst dedicating remaining resources to execution of a safety-critical software application, thereby enabling parallel execution of the diagnostics software application and the safety-critical software application. There is also provided a controller for multicore processor fault detection during execution of safety critical software applications in a multicore processor environment. The controller includes a multicore processor environment. The controller may be part of a control system. The method may be provided as a computer program.

Abstract: An industrial robot device includes a swivel with an attachment mechanism for the attachment of a tool. The attachment mechanism includes at least two different attachment devices for two different kinds of tools. A first attachment device includes a positioning mechanism defining a certain angular position of an attached tool relative to the swivel. A second attachment device is arranged for allowing an arbitrary angular position of an attached tool relative to the swivel. Also contemplated is an industrial robot that is provided with the invented device and to a method for manipulating objects.

Abstract: An actuator for a tap changer of an electrical transformer, including: a piston, being hollow to define a piston space; a cylinder arranged around the piston such that the piston is arranged to be movable axially into and out of the cylinder; a piston ring fixed to the outside surface of the piston such that a cylinder space is formed between the piston and the cylinder and delimited by the piston ring, the cylinder space having a variable volume which is configured to vary with axial movement of the piston; and a spring engaging both the piston and the cylinder such that the spring is able to be compressed and elongated, respectively, with axial movement of the piston. The piston space is connected to the cylinder space via at least one hole through the hollow piston. The piston space is connected to an outside of the piston.

Abstract: A low-voltage switching device including a plurality of arc-extinguishing chambers, wherein each of the arc-extinguishing chambers encloses a contacting unit including a stationary contact and a movable contact and arcs are formed when the movable contact is disconnected to the stationary contact, each of the arc-extinguishing chamber including a plurality of U-shaped arc extinguishing plates arranged for splitting, guiding and cooling the arc formed between the contacts and sidewalls provided with guiding means for guiding the arms of the arc extinguishing plates. The guiding means includes a plurality of supporting plates and the supporting plates are arranged protruding towards interior of the arc-extinguishing chamber for receiving the arms of the arc-extinguishing plates and for providing electrical isolation between arms of two adjacent arc extinguishing plates.

Abstract: An insulator for separating two objects with different electrical potential, the insulator including an insulating body enclosing a first volume for housing a gas, the body being provided with an opening, and a sealing arrangement arranged to seal the opening in the body and including a first gas-tight sealing element for sealing the opening and provided with a first closable opening, and a second gas-tight sealing element for sealing the opening, and arranged inside the first sealing element so that the first and second sealing elements define a second volume significantly smaller than the first volume. The second sealing element is provided with a second closable opening which in cooperation with the first closable opening enable control of the gas pressure in the first volume. Methods for leakage detection of the insulator are also disclosed.

Abstract: An arc monitor for tripping a circuit breaker in the event of an arc occurrence, the arc monitor including at least one arc detector and arranged to be operatively connected to at least one circuit breaker. The arc monitor includes a base unit and at least one extension unit with at least one arc detector input terminal, the at least one arc detector being connectable to the at least one arc detector input terminal, and the base unit includes a control unit. The extension unit is operatively connectable to and arranged to send an arc occurrence signal to the control unit, which is arranged to send a trip signal for tripping the at least one circuit breaker, in the event of an arc occurrence. Also an electrical installation including an arc monitor, and the use of an arc monitor as a supervision and safety equipment in an electrical installation.

Abstract: A power cable assembly device adapted to be arranged in the spaces between neighbouring power cores of a power cable, includes an extruded profiled body made of a polymer material and adapted to the cross-sectional shape and elongation of the power cable, the profiled body including a chamber and defining a slit to the chamber, the chamber being adapted to receive a fibre optic cable via the slit. Substantially the whole surface of the profiled body inside the chamber, the surface of the profiled body defining the slit, and the surface of at least a region outside the profiled body extending from the slit and away from the slit is provided with a layer of semi-conductive material.

Abstract: A fault sensing system for a power system including a protected unit is disclosed. The fault sensing system is adapted to sense a fault in the protected unit. The fault sensing system includes at least one current sensing unit adapted to sense at least one first current in a first position in the protected unit and at least one second current in the second position in the protected unit and at least one voltage sensing unit adapted to sense at least one first voltage in the first position and at least one second voltage in the second position, and at least one processing unit.

Abstract: A method, data presenting device and computer program product are provided for assisting a remote user. The data presenting device includes a communication interface, a camera having a field of view in which images are captured, a projector having a presentation area in which presentation items may be presented, and a control unit which receives field of view control commands a command to project a presentation item in the presentation area, controls the field of view of the camera and controls the projector to project the presentation item in the presentation area, wherein the control of the projection in the presentation area is made independently of the control of the field of view.

Abstract: Cells in a phase leg of a multilevel converter are controlled through regulating, using tap-changer control, the modulation index of the converter to above 0.80, providing a group of carrier waves for the phase leg, where these carrier waves are identical but displaced in time from each other with a time delay, providing a voltage reference for the phase leg being separate from voltage references provided for other phase legs, stop switching of the cells when waveform values of a power transmission converter waveform are detected to be in a selected interval around a peak value of the power transmission converter waveform and control switching of the cells based on comparisons of the respective carrier waves with the voltage reference when the waveform values of the power transmission converter waveform are detected to be outside the selected interval.

Abstract: It is presented a method executed in a transmission system, the transmission system comprising an AC grid, a DC grid and at least two AC/DC converters connected between the AC grid and DC grid. The method comprises the steps of: obtaining set points for each one of the at least two AC/DC converters, each set point comprising a magnitude and direction of power through the respective AC/DC converter during normal operation generating, based on the set points, a virtual AC grid, the virtual AC grid corresponding to AC behavior of the DC grid, as viewed from each AC side of the at least two AC/DC converters; and controlling the at least two AC/DC converters to mimic a behavior in accordance with the virtual AC grid. A corresponding transmission system is also presented.

Abstract: An industrial robot includes first and second kinematic chains configured to transmit the movements of corresponding first and second actuators to respective movements of an end effector. The first kinematic chain includes a first rod which is stiff. The second kinematic chain includes elements between the second actuator and the first rod such that the actuation of the second actuator causes bending forces on the first rod. The first and second kinematic chains thereby have the first rod as a common element, which improves compactness and accessibility of the robot. This improvement assumes that the robot is provided with one or more stiff rods that can bear the bending forces resulting from the actuation of the corresponding actuators.

Abstract: A terminal bushing sealing element is adapted to be fitted between a terminal bushing and a barrier element. The sealing element is elastic, has an annular shape, and includes a wall with an inner surface and an outer surface. A first opening is provided at a first end of the sealing element and a second opening is provided at a second end of the sealing element, which is opposite to the first end and the wall extends between the first end and the second end. The wall includes a first wall portion that is inclined such that a diameter of the sealing element increases from the first end in the direction towards the second end. The sealing element provides for improved sound attenuation while maintaining a long creepage distance and may be used in sound attenuation casings that are included in power capacitor arrangements.

Abstract: An electrical insulation system for a high voltage inductive device includes a cylindrical insulation barrier defining an axial direction, a longitudinal bar having a main extension in the axial direction, the longitudinal bar arranged to support the cylindrical insulation barrier along the axial direction and to provide spacing in a radial direction, and the longitudinal bar having a first side facing the cylindrical insulation barrier and a second side, opposite the first side, having a groove, and a spacer having a main extension in the radial direction, the spacer being arranged to provide spacing in the axial direction, the spacer having a groove fitting end portion. The longitudinal bar is adapted to receive the groove fitting end portion of the spacer in the groove, and wherein the spacer is dimensioned so relative to the groove that the groove captures any streamer propagating from the spacer towards the cylindrical insulation barrier.

Abstract: An apparatus for enclosing a medium and/or high voltage unit connectable to an electric power system. The unit includes one or a plurality of electrical components and generates heat as a by-product during operation. The apparatus includes a housing including a main chamber housing a seat for holding the unit. The main chamber is arranged to house the unit. The housing includes at least one gas exit opening at an upper part of the housing and at least one gas entry opening. The housing includes a sound-absorptive gas exit chamber provided with the at least one gas exit opening. The housing includes a sound-absorptive gas entry chamber provided with the at least one gas entry opening. A first free heat convection path is provided inside the housing between the at least one gas entry opening and the at least one gas exit opening, via the gas entry chamber, via the main chamber and via the gas exit chamber, in order to provide cooling.

Abstract: A subsea unit includes a housing containing a dielectric liquid, a first heat generating component and a second heat generating component. The first heat generating component is arranged in thermal connection with the housing and the second heat generating component is arranged at a distance from the housing. A method of cooling heat generating components contained in a housing of a subsea unit is also presented.

Abstract: A tool for opening an extruded profiled body of a power cord assembly device includes at least one pair of guides and at least one support, the pair of guides and the support being arranged in a frame, wherein a first guide of the pair of guides is arranged and shaped to releasably connect to the an interconnection area of the profiled body, and wherein a second guide of the pair of guides is arranged and shaped to releasably connect to a second interconnection area of the profiled body, said support being provided with a support member adapted to bear against a portion of the first wall opposite to a slit in the profiled body, the distance of the pair of guides relative to the support being such that the slit is widened in the area of the elongation of the profiled body where the tool is applied, thereby allowing a fibre optic cable to be introduced into the chamber.

Abstract: A jig for calibrating a Delta robot fixes the longitudinal axes of drive arms to be parallel. With this configuration, the jig always fixes the drive arms at the same reference angle no matter what the drive arm length is.

Abstract: A power cable assembly device adapted to be arranged in the spaces between neighbouring power cores of a power cable, includes a profiled body made of a polymer material and adapted to the cross-sectional shape and elongation of the power cable, said profiled body including a chamber and a slit to the chamber, the chamber being adapted to receive a fibre optic cable via the slit. The profiled body is provided with a pair of transitions converging towards the slit, the transitions being adapted to supportingly receive a fibre optic cable to be introduced through the slit.