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: 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.

Abstract: The present invention relates to a polymer composition suitable for the manufacture of an electrical insulation layer for cables having superior mechanical and electrical properties and being environmentally friendly, to a cable comprising said polymer composition as well as to the use of the polymer composition as an electrical insulation layer in cables.

Abstract: A method and system for controlling electrical power in a micro-grid, especially during islanding when the micro-grid is disconnected from a main grid is described. A potential load shedding for islanding is determined when the micro grid is connected to the main grid. The potential load shedding is performed when a grid switch that connects the micro-grid to a main grid opens. A frequency based load shedding and a frequency based control of power injections to the micro grid may also be performed. The frequency based load shedding is performed with a faster response than the power injection control during islanding. The frequency based power injection control is performed with a faster response than the frequency based load shedding when the micro grid is connected to the main grid. A load shedding controller, an energy storage controller and methods performed by the load shedding controller, and the energy storage controller, respectively, is also provided.

Abstract: Invention provides a system and method for separating sound from an object of interest from its background and condition monitoring system and mobile phone using the same. The sound separating system includes a sound source localizing part, including at least one microphone and a processing unit, and an object direction reference determination part, determining, as object direction reference, information on directions of the object of interest with respect to the sound source localizing part; wherein the processing unit obtains information on a direction from which sound arrives at the sound source localizing part from the sound source by using microphone signal, and comparing it with the object direction reference so as to filter the sound from the background of the sound source. By having the sound separating system, it can extract the background noise from a specific device respective location and analyse only these signals from the object of interest.

Abstract: A method to control a voltage source converter (CON1; CON2) in a HVDC system comprises the step of controlling a frequency and a voltage amplitude of an AC voltage (UV1; UV2) generated by the voltage source converter (CON1; CON2) independently of the conditions in an AC network (N1; N2) connected to the voltage source converter (CON1; CON2). This method is performed by a control unit of a HVDC system. In a special embodiment, the method forms the basis of a method to black start an AC network, where the AC network comprises transmission lines and is connected to at least two AC power stations, where one of the at least two AC power stations is connected via a HVDC system to the AC network.

Abstract: A method for automatically landing a container on a landing target using a container crane is disclosed. The container crane includes a trolley and spreader for holding and lifting the container and a crane control system for controlling movements of the container crane. A distance from the container to the landing target is measured and the container is moved towards the landing target dependent on the measured distance. A plurality of images of the landing target is made using at least one camera mounted on the spreader. The images are processed to identify one or more landing features in the images of the landing target. Distances from the container to the landing target are calculated based on a measurement of distance between the container and the landing features in the images.

Abstract: A method is performed in a control device for controlling a power compensation arrangement including a voltage source converter and one or more power compensation branches, each power compensation branch including a thyristor controlled reactor, a thyristor switched reactor or a thyristor controlled capacitor. The voltage source converter and the one or more power compensation branches are connected to a same busbar. The method includes: detecting a request in an electrical power system to which the power compensation arrangement is connected; determining, based on the request, a need for reactive power supply to the electrical power system; providing reactive power by means of the voltage source converter and/or by one or more of the power compensation branches; and compensating, by means of the voltage source converter, any disturbances caused by the power compensation branches when providing the reactive power to the electrical power system. Corresponding devices are also disclosed.

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 fiber optic cable to be introduced into the chamber.

Abstract: A high voltage electrode arrangement includes a dome-shaped top portion, a toroid-shaped bottom portion, and an intermediate portion for connecting the top portion and the bottom portion. The intermediate portion includes a lead-trough for receiving high voltage equipment to be interconnected.

Abstract: The invention relates to methods and devices for controlling unbalanced active power flow in a three-phase modular multilevel converter 20. The converter 20 comprises a first and second converter 4, 5 both comprising three phase legs arranged in a wye-connection. The first and second converters 4, 5 are interconnected in a double-wye connection, and their neutral paths are independently floating.

Abstract: A method for controlling a chain-link power converter including three phase legs, each of which phase legs includes a plurality of series-connected converter cells, each of the cells including a DC capacitor, the phase legs being connected in a delta configuration. The method includes detecting an unsymmetrical voltage condition at a terminal of the converter; determining a ratio between a zero sequence and a negative sequence component of a compound current to be injected into the converter, based on the detected unsymmetrical voltage condition; calculating the compound current comprising the zero sequence component and the negative sequence component in accordance with the determined ratio; and injecting the compound current into the converter to control the converter in view of the detected unsymmetrical voltage condition.

Abstract: A protection feature is disclosed for a self powered protection relay having, for example, sensitive earth fault protection. Protection can be achieved in tandem with optimal power on trip time and with integrated logic for inrush discrimination. The self supplied protection relay can include a current processing module to measure and evaluate line current to generate a trip signal, and to suppress inrush current to block earth fault detection during an inrush condition and thereby increase sensitivity of fault detection.

Abstract: A high voltage electrode arrangement includes a dome-shaped top portion, a toroid-shaped bottom portion, and an intermediate portion for connecting the top portion and the bottom portion. The intermediate portion includes a lead-trough for receiving high voltage equipment to be interconnected.

Abstract: It is provided a power converter for transferring power between a high voltage DC connection and a high voltage AC connection. The power converter includes a power converter assembly including: a first converter arm, a first reactor, a second reactor and a second converter arm, connected serially between the positive and negative terminals of the DC connection. The high voltage AC connection is provided between the first reactor and the second reactor. Each one of the converter arms includes a plurality of converter cells and each one of the converter cells includes a switching element and an energy storage element. Both the first reactor and the second reactor are oil filled reactors.

Abstract: The present invention relates to a material comprising reduced graphene oxide, wherein the degree of reduction of the graphene oxide exhibits a spatial variation so that the material exhibits a gradient in the electric conductivity and/or permittivity. The material can for example be used in an electric device for purposes of field grading and/or dissipation of charges. Examples of electric devices wherein the material is beneficial includes cable accessories, bushings, power cables, microelectronics, switchgear, etc. The invention further relates to a method of producing a material for electrical applications. The method comprises treating different parts of a graphene oxide element differently, so as to achieve a different degree of reduction of the graphene oxide within the element, resulting in a sample having a gradient in the electrical conductivity and/or permittivity.

Abstract: An elongation ring adapted for use in a self-ventilated traction motor and for fixed placement between the non-driving end of the motor housing and a motor end shield. The ring has radial air outlet openings placed along its circumference and is adapted to enclose a fan wheel fixed on a motor driving shaft. A traction motor having such an elongation ring is also contemplated. The elongation ring provides a possibility to easily adapt a motor housing to different motor types such as a self-ventilated motor with the ring, or one with forced ventilation without the ring.

Abstract: A converter arrangement and a method of controlling a three-phase converter arrangement connected to a transmission grid are provided. The converter arrangement includes three phase legs and an energy transfer circuit. The method includes providing a varying respective output phase voltage to the transmission grid by selecting energy storage elements of both the phase legs and the energy transfer circuit and connecting the selected energy storage elements to the transmission grid output. The method further includes selecting energy storage elements for performing a transfer of energy between the energy storage elements during the control period.

Abstract: A method, computer program product and video communication device are provided for transmitting video to a remote user. The video communication device includes a communication interface for providing a communication session with a device of the remote user, a camera capturing images, and a control unit configured to obtain a three-dimensional model of the location, control the camera to capture video images of the location, determine a current orientation of the video communication device, and transfer the three-dimensional model and orientation to the device of the remote user together with a video stream from the camera comprising the captured video images.