Abstract:
The present disclosure relates to an electrical bushing (1) comprising an electrically insulating sleeve (2) having a central longitudinal through hole (4) surrounding a central longitudinal axis (5) of the bushing, and an electrical conductor (3) positioned through the central longitudinal through hole (4) of the sleeve. The conductor comprises a longitudinal outer tube and a longitudinal inner tube (3b), concentrically located within the outer tube (3a), such that a tubular space is formed between the outer tube and the inner tube. A first end of the tubular space is delimited by a tube spacer (10) between the outer tube and the inner tube, and a second end of the tubular space is capped to form an enclosed tubular space. The enclosed tubular space contains a heat transfer fluid whereby a heat-pipe (6) is formed between the outer tube and the inner tube of the conductor. The outer tube extends longitudinally beyond the heat-pipe delimited by the tube spacer at the first end of the tubular space, and the inner tube has a design at said first end such that fluid can pass from between the outer tube and the inner tube into a central longitudinal space (9) formed in the inner tube, without passing longitudinally beyond the extension of the outer tube.
Abstract:
The present invention provides a system and method for advising wireless computer networks on inter-network interferences during their life time. The method of the present invention initially observes initial channel utilization profiles along with corresponding time-slots of dynamic network elements and network characteristics of a first network and stores as historical channel utilization profiles. The initial transmission profiles an interfering second network are also recorded. The threshold transmission profiles are then recorded as historical transmission profiles. The aggregator determines interference patterns, by comparing historical channel utilization profiles with runtime threshold transmission profiles and advises and pre-warns appropriate network actions to a network manager of the first network on the interference prone zones. The system of the present invention includes a first network with a common multi-network interference observer, to advise on inter-network interferences.
Abstract:
A robot controller (3) for controlling the operation of a robot unit (1). The robot unit comprises a plurality of robot arms (5a-c) that each comprises at least one motion mechanism (7a-d, 8) adapted to set the robot arm in motion, wherein a tool (4) of the robot unit is adapted to be moved along an operational path (2). The robot controller is adapted to determine the kinetic energy subjected to each motion mechanism of the robot arms (5a-c), and, on basis of the determined kinetic energies, control the speed of each motion mechanism, while maintaining a movement of the tool along the operational path, so that said kinetic energy does not exceed a certain level.
Abstract:
A method for detecting the status of a mesh node in a wireless mesh network, wherein a gateway is building up a vector over time by combining active detection, passive detection and binary tests on anomaly metrics and wherein the status of the mesh node is regarded as misbehaving when the vector reaches a certain level.
Abstract:
The invention relates to an electric field control device (10, 10a) for a high voltage cable (16). The electric field control device (10, 10a) comprises a stress cone (12) and a field grading adapter (13), wherein the stress cone (12) and the field grading adapter (13) are chemically bonded by vulcanization. The invention also relates to an electric installation comprising a power cable and the electric field control device (10, 10a), and to a method for producing the electric field control device (10, 10a).
Abstract:
The present invention relates to a system and a method for determining/predicting a tapping time for a metal melt in an electric arc furnace (EAF), wherein at least one electrode is provided for melting the metal melt until it reach a target tapping temperature, wherein the EAF further comprises a slag and smoke layer on the surface of the metal melt, wherein an electromagnetic stirrer is provided for stirring the metal melt. The method comprising supplying a power to the electrode in order to melt a scrap to a metal melt (S10), electromagnetic stirring the metal melt in the EAF (S20), blowing away the slag and smoke from the surface of the metal melt (S30), non- contactingly measuring a temperature of the metal melt (S40), receiving the measured temperature (S50), calculating a temperature profile based on the received temperature (S60), estimating/predicting a tapping temperature at a time point based on the calculated temperature profile (S70), and determining a tapping time based on the estimated temperature, the target tapping temperature and the power supplied to the electrode (S80).
Abstract:
An industrial control system with communication bar and power bar is provided. The industrial control system comprises a plurality of I/O modules; a plurality of terminal boards; at least one communication bar having an input connected with a controller and a plurality of output interfaces, wherein each output interface connects with one I/O module or one terminal board; at least one power bar having an input connected with power supply and a plurality of output interfaces, wherein each output interface connects with one I/O module or one terminal board; wherein each I/O module communicates with one corresponding terminal board through the communication bar respectively.
Abstract:
The present disclosure relates to a control method performed by a control system 6 in a microgrid 1 comprising a plurality of electrical phases A, B and C, in which a first single-phase distributed generator (DG) 4 is connected to a first phase A and configured for injecting power into said first phase, and a second single-phase DG 4 is connected to a second phase B and configured for injecting power into said second phase. The method comprises, when the microgrid is connected to a power grid 2, commonly controlling the phases which are in sync with each other, in a grid connected control mode. The method also comprises detecting that the microgrid is islanded from the power grid. The method also comprises, in response to the detected islanding, switching control mode from the grid connected control mode to an islanded control mode. The method also comprises, in the islanded control mode, individually controlling each of the phases based on the power balance of the phase.
Abstract:
A multilevel converter (10) converting between AC and DC comprises a phase leg having a first and a second phase arm, the first phase arm being connected between a first pole (P1) having a first potential (Vdp) and a first AC terminal (ACA1) and the second phase arm being connected between the first AC terminal (ACA1) and a second potential (Vdn), where the phase arms comprise half-bridge and full-bridge cells, where each cell comprises at least one energy storage element for providing the voltage contribution and cell switching units with cell switches and anti-parallel diodes for controlling the voltage contribution, where the full- bridge cells comprise a bypass switch controllable to bypass the corresponding energy storage element, and when a phase-to-ground fault occurs the cell switches are blocked and the bypass switches activated with a delay in relation to the blocking.
Abstract:
The present disclosure relates to a valve arrangement(400) comprising a plurality of valve units (410-450) electrically connected in series. A first valve unit (410) includes a container (130) in which at least one stack of converter cells (120) is arranged. The container is at least partially filled with an electrically insulating gas(115). The valve arrangement further comprises at least one first connector (460) including a first busbar element (461) electrically connecting a cell (421) of the first valve unit at one end of the container to a cell (441) of a second valve unit(420). The first connector is insulated by an electrically insulating gas(465). Further, the valve arrangement comprises at least one second connector (470) including a busbar element (471) for connection of another cell of the first valve unit at another end of the container.