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: A converter system for coupling to an ac power source includes a rectifier and a bi-directional converter. The rectifier has a first set of terminals inductively coupled to an ac power source and a second set of terminals coupled in series with a series dc bus, and is operable to convert ac power at the first set of terminals to dc power at the second set of terminals. The bi-directional converter has a first set of terminals coupled to the ac power source and a second set of terminals coupled to a parallel bus, and is operable to transfer power from the ac source to the parallel bus in a first operating mode and transfer power from the parallel bus to the series dc bus via the rectifier in a second operating mode. A corresponding power generation network and power transmission method are also provided.

Abstract: The disclosure relates to an electrical switching device, which switches stroke-dependently, with extended switching hysteresis, including a switching element with a contact lever, the switching element cooperating with an actuating element movably guided in a holding device. The actuating element has a step-shaped portion for actuating the contact lever of the switching element and the actuating element has an opening in which an engagement element designed as a bolt or a pin engages when a switching action is initiated. The opening provided in the actuating element is formed as an elongated hole, in which the engagement element engages in order to achieve a switching stroke and a defined hysteresis is thus set depending on the design of the elongated hole.

Abstract: A circuit breaking arrangement is adapted to be connected to a current path in at least one transmission line arranged to carry an electrical current for controllably effecting discontinuation of flow of electrical current in the at least one transmission line. The circuit breaking arrangement includes a plurality of series connections of a plurality of power semiconductor switching elements. The plurality of series connections of power semiconductor switching elements are connected in parallel relatively to each other.

Abstract: Automatic reclosing of a fault interrupting device is overridden by establishing communication with a control system for a fault interrupting device operable to open responsive to a fault on an electric distribution system and automatically reclose after a predetermined time delay, and analyzing data for the electric distribution system by an apparatus separate from the fault interrupting device control system and having higher performance than the fault interrupting device control system, to determine whether to block the automatic reclosing of the fault interrupting device before the fault interrupting device automatically recloses. An autoreclosing block command is generated by the apparatus if the apparatus determines the automatic reclosing of the fault interrupting device should be blocked. The autoreclosing block command is sent from the apparatus to the fault interrupting device control system to prevent the automatic reclosing of the fault interrupting device after the predetermined time delay.

Abstract: The invention relates to a method for joining of a first field device to a wireless sensor actuator network using a configuration tool. The wireless sensor actuator network comprises a plurality of interconnected field devices and gateway for connecting the interconnected field devices to a plant automation network comprising controllers and network manager. The method comprises receiving device information associated with the first field device, transmitting a commissioning request for the first field device, the commissioning request comprising device information and geographical location information of the first field device, receiving commissioning information comprising a session key, a network key and routing information, and commissioning the first field device using the received commissioning information for joining the said field device to the wireless sensor actuator network.

Abstract: A voltage measurement device includes an insulating body, for the use in medium- or high-voltage equipment or switchgears The insulating body includes an impedance divider having at least one high voltage impedance and at least one low voltage impedance in series, and with shielding electrodes. In order to optimize the circuit design for voltage measurement design in a given application and prevent the risk of malfunction when the same device it is used in multiple applications or at severe environmental or operating conditions, the device includes at least one high-voltage shielding electrode and/or at least one low-voltage shielding electrode which dimensions together establish a physical length of the impedance divider. The shielding electrodes surround the high and/or low voltage impedances, which provide a specified voltage division ratio and which are located inside or outside of the insulating body. An output of the impedance divider is connected to a shielded cable.

Abstract: A part (11) of a conducting bar (5) for an electrical apparatus, such as a terminal block, the part (11) of the conductive bar (5) comprising a first planar portion extending along an extension direction (15) of the part (11) of the conducting bar (5), a second planar portion (23) extending along the extension direction (15), the extension plane (25) of the second portion (23) being transversal to the extension plane (21) of the first portion. The part (11) has a first cutout along a first contour arranged in the first portion and a second cutout along a second contour arranged in the first portion.

Abstract: Exemplary embodiments provide substation automation systems for operating a high or medium voltage substation for an electric power transmission or distribution network. The substation automation system includes a multitude of secondary devices, which transmit and receive data from/to each other via multicast packets. The secondary devices include packet filters, which are adapted to be set up dynamically during the runtime of the substation automation system, in order to update the rules for forwarding multicast packets received from the station bus system to the application running on the secondary devices.

Abstract: A spacer system for a semiconductor switching device which is formed as a spacer ring and a plurality of insulating elements and supporting elements are arranged in an alternating manner around a circumference of the spacer ring. The insulating element includes a recess receiving a cathode gate connector element. The supporting element includes a projection receiving a spring system for clamping while assembling the switching device. The switching device includes a substrate, a cathode pole piece, an anode pole piece, strain buffer plates and a gate ring. Further connector elements, are electrically connecting the cathode pole piece and the gate ring of the semiconductor switching device to an external circuit unit. The space between the connector elements is minimized in order to reduce the gate circuit impedance, thus enabling an increased maximum turn-off current and further allowing for the use of larger semiconductor switching devices for high power applications.

Abstract: An on-load tap changer is provided having a plurality of modules, each of which is operable to change taps in a transformer winding. The tap changer includes a motor connected to rotate at least one shaft. The at least one shaft is connected to the tap change modules and is operable upon rotation to cause the tap change modules to each perform a sequence of operations that effectuate a tap change. A multi-turn absolute encoder is connected to the at least one shaft. A monitoring system is connected to the encoder and is operable to determine from the position of the at least one shaft where the tap change modules are in the sequence of operations.

Abstract: A multi-level power converter includes switching cells, each comprising switching devices and an energy storage element. The switching cells include switching cells of a first type and switching cells of a second type. The converter includes, for each phase, a first arm of serial connected switching cells and a second arm of serial connected switching cells, which first arm and second arm are connected in parallel. The first arm includes more switching cells of the first type than switching cells of the second type and the second arm includes more switching cells of the second type than switching cells of the first type. The switching cells of the first type have lower conduction loss than the switching cells of the second type. The converter is arranged so that a larger current flows through the first arm than the second arm.

Abstract: Exemplary systems and methods for monitoring a current state of a spatially extensive supply network having at least one control station that monitors and controls the supply network and a plurality of sensors that transmit measurement values relating to operating behavior to the at least one control station. Current measurement values are measured at positions on the supply network corresponding to each sensor. Each sensor analyzes measured signal variations and signal trends of the measured current values via an evaluating unit. The measurement values of each respective sensor are transmitted to the at least one control station in data packets at a defined time.

Abstract: A DC supply unit includes a first current blocking device arranged to allow current to flow in a first direction through the first current blocking device, and to block current that flows in a second direction opposite the first direction. In this context, the first direction is the flow direction of current during normal operation of the DC supply network. The DC supply unit further includes a first switching unit arranged in anti-parallel connection with the first current blocking device, wherein the first switching unit is controllable in its on-state to selectively allow reverse current during normal operation of the DC supply network to flow through the first switching unit in the second direction so as to bypass the first current blocking device and in an off-state to block current in the second direction when a fault occurs in the DC supply network.

Abstract: A medium or high voltage arrangement with a cable connection terminal and a voltage sensor is disclosed, wherein the voltage sensor has a resistive voltage divider and shielding electrodes. In order to enhance the accuracy of voltage measurement at medium or high voltage pole parts, the voltage sensor can be applied as a voltage sensor module, which can be integrated in a further cable connection terminal, and the shielding electrodes can be an integral part of the voltage sensor module or an integral part of an insulating housing part of the further cable connection terminal.

Abstract: A method of characterizing a wet paint layer of a painted body by paint layer parameters based on fitting to a physical model is provided. The method is carried out by a sensor system in a non-contact manner, the sensor system including an emitter system for emitting THz radiation, a detector system for detecting THz radiation, and a processing unit operationally coupled to the emitter system and the detector system. The method includes: Emitting, by the emitter system, a THz radiation signal towards the painted body such that the THz radiation interacts with the wet paint layer, the wet paint layer having not yet finished a drying process during which the wet paint layer becomes a dry paint layer; and Detecting, by the detector system, a response signal being the detected THz radiation signal having interacted with the wet paint layer.

Abstract: A self-commissioning method for estimating differential inductances in an electric machine, such as e.g. a synchronous reluctance machine or interior permanent magnet machine, with cross-magnetization effects is provided. The electric machine is driven with PWM voltages to explore current plurality of operating points of the currents in the electric machine while keeping the electric machine at standstill or quasi-standstill. At each operating point PWM switching voltage transients are used as a small-signal excitation. Currents of the electric machine are measured by means of oversampling, which permit the reconstruction of the waveforms including the current ripple within a PWM period caused by the PWM switching transients. Finally, the differential inductances at each operating point are determined based on the determined direct and quadrature current waveforms and voltages.

Abstract: A method, field user presenting arrangement and a computer program product for enabling an operator of a process control system to determine the location of field users in the process control system are provided. The arrangement includes a presentation control unit that obtains position data of the position of a field user, obtain the positions of objects in the process control system, compares the position of the field user with the positions of the objects, determines that the field user is in the vicinity of an object if the distance between the position of the field user and the position of the object is below a proximity threshold, and presents the field user on graphics depicting the process, where a field user deemed to be in the vicinity of an object is presented at this object in the graphics.

Abstract: A knife switch assembly including a pair of hinged contact knives, arranged in parallel, and moveable between at least two positions. An operator device for moving the pair of contact knives between the at least two positions, and a guide member located between the two contact knives, having two projecting side parts, each projecting side part extending along at least part of a respective side of each contact knife, which side faces a corresponding side of the other contact knife.