Abstract: A plant for transmitting electric power includes a direct voltage network (100) and at least one three-phase alternating voltage network (101) connected thereto through a station (102). This station includes a Voltage Source Converter (103). A unit (104) is configured to control the converter according to a PWM pattern for generating an alternating voltage having a third harmonic voltage part added to a fundamental voltage part. No transformer is arranged between phase outputs (106) of the converter and the alternating voltage network (101). An arrangement (107) is configured to block the third harmonic voltage part and prevent it from reaching the alternating voltage network.

Abstract: An arrangement for attaching a permanent magnet to the rotor of an electrical machine and such a rotor are provided. The rotor is assembled of sheets and includes at least two magnetic poles and a magnetic core. Permanent magnets are installable on a surface of the magnetic core, and a pole piece assembled of sheets is installable on a side of the permanent magnet that faces an air gap. At least one channel passing through the pole piece is built in the pole piece and magnetic core. A tightening strip is installable in the channel. The tightening strip is attachable to the pole piece using locking parts, and an end of the tightening strip facing the magnetic core includes fixing parts for attaching the tightening strip to the magnetic core.

Abstract: A breaker failure detection device for a direct current (DC) circuit breaker (200) is provided. The circuit breaker comprises a circuit breaking element (204) and a non-linear resistor, e.g., a surge arrester (205), connected in parallel. The breaker failure detection device comprises a current sensor (212, 213, 214, 215), for measuring a current commutating from the circuit breaking element (204), and a breaker failure detection unit (211). The breaker failure detection unit (211) is arranged for comparing the measured current to desired values and deciding that an internal commutation process of the circuit breaker (200) does not proceed as desired if the measured current deviates from the desired values. The present invention makes use of an understanding that an improved detection of breaker failures may be achieved by monitoring the internal commutation process of the circuit breaker. Further, a method of breaker failure detection is provided.

Abstract: An air dehydrating breather assembly and method provide dehumidifying air suitable to be supplied into oil expansion vessels used in electrical devices. The air dehydrating breather assembly includes first and second air demoisturizer units respectively associated with two corresponding oil expansion vessels. The first air demoisturizer unit includes a first tank housing moisture absorber and a second tank housing moisture absorber alternatively providing dehumidified air. The second air demoisturizer unit includes a third tank housing moisture absorber providing dehumidified air. Sensors are associated with the first, second and third tanks to detect the level of saturation of their moisture absorbers. An electronic processing unit is operatively associated with the sensors for routing dehumidified air to the associated oil-expansion vessels from the tanks whose moisture absorbers are not saturated.

Abstract: An embedded pole part is provided with an isolating housing made of thermoplastic material. The housing embeds an interrupter as well as the electric terminals of the pole part. At an outer surface of the housing, horizontal and/or vertical aligned three-dimensional structures joined by material engagement are implemented into the thermoplastic material, to achieve a higher mechanical stiffness as well as higher creepage length of the pole part. The mechanical and dielectric parameters of the pole part are thereby strengthened, for example, in the case of a short circuit current.

Abstract: The disclosure relates to a switching device with a vacuum interrupter chamber in which at least one moving contact piece is arranged. To considerably increase the switching rating and the dielectric strength, the disclosure proposes that two series-connected contact arrangements with a total of two contact levels which can be opened are arranged within a vacuum interrupter chamber.

Abstract: An electric transformer comprising: a magnetic core; at least one coil assembly which is positioned around a portion of the magnetic core and comprises a plurality of windings; a structure adapted for applying a clamping force on the magnetic core and/or the windings; and a cooling circuit adapted for conveying cooling fluid directly inside the coil assembly.

Abstract: An electrical circuit-breaker device includes at least one pole part with a respective housing arrangement for encapsulating an interrupter insert having two corresponding electrical contacts, and an adjacent actuator part for mechanically moving one of the electrical contacts via an intermediate operating mechanism. A method of producing the device includes molding a multi-chamber housing by injection molding of plastic material with a first chamber and at least one further chamber, assembling the actuator part in the first chamber and the at least one respective interrupter insert in its own further chamber, and assembling the intermediate operating mechanism through an assembly opening in a common side wall between the first chamber and the at least one further chamber.

Abstract: A permanently installed manual trip mechanism is mounted internally to a circuit breaker with a user operated handle extending to the outside of the enclosure. The mechanism converts a relatively small operator input to larger spring charge. Upon triggering, the mechanism provides the required operating velocity of the circuit breaker during the opening stroke for load break operation.

Abstract: A low-, medium-, or high-voltage switching device includes a chemical charge unit for actuate closing and/or opening of electric contacts, and a fuze- or ignition cable with chemical charge material to ignite the chemical charge. In order to reach an effective galvanic separation, the chemical charge material of the fuze-cable is electrically insulating, at least in the status before ignition, and at least along a part of its length, in order to cause or effectuate a voltage potential separation between a definite low, medium or high-voltage level and an earth level.

Abstract: A single-coil actuator for low or medium voltage applications which comprises a first assembly which comprises a first casing having a first half-casing and a second half-casing coupled to each other. The first casing defines an internal space housing an electromagnet having a coil and an armature movable between two positions. The first half-casing has a first opening for the mechanical coupling of the armature with an external element, while one of the first or second half-casing has a second opening for the electrical connection of the electromagnet. The electrical connection comprises a first connection element of the socket and plug-type connection which is electrically connected to the coil and positioned in correspondence of the second opening.

Abstract: The present invention relates to an apparatus for connection between power transmission system field equipment and control and protection equipment and comprising at least one input/output module (24). The module (24) comprises a box (34) enclosing a circuit board with at least one signal handling unit, at least one bus connector (36, 38) that stretches through a first side of the box, and a set of terminal blocks (40) for connection of field wires to the field equipment, where the terminal blocks are placed on a second side of the box. The at least one signal handling unit includes at least one unit for conversion of input and output signals to and from the field equipment and bus communication according to a bus communication protocol.

Abstract: The disclosure relates to a spherical cap for a high-voltage outgoing line, including an electrically conductive element, which is arranged hollow-cylindrically about a rotational axis and which merges into a hemispherical form at its first axial end. A connection device has a passage opening for electrically and mechanically connecting the element, to an electrical screening pipe. At least two insulation barriers are spaced apart from one another and respectively adapted to the form of the hollow-cylindrical element and enclose the latter at a respective first and second distance. The insulation barriers respectively have a pipe attachment connector for leading through a screening pipe to the connection device. The first insulation barrier is spaced apart from the second insulation barrier by at least one insulation ring which is arranged about the rotational axis and which has a radially fashioned corrugated form.

Abstract: A method is provided for compensating the flux drift caused by measurement and/or calculation errors when controlling a rotating electrical machine. The flux drift of the estimated flux vector may be compensated for by comparing the length of the flux vector with a reference flux magnitude which already has been determined for controlling the inverter. Depending on the comparison, the length of the estimated flux vector may be lengthened or shortened.

Abstract: Optical sensor structure senses the presence of liquid in a sealed conservator tank. The sensor structure includes a sensor head having a body with first and second opposing ends, a plurality of perforations through the body and spaced between the first and second ends, and a mirror disposed at the second end. The perforations are constructed and arranged to receive and hold fluid therein. The sensor head is constructed and arranged to rest on a surface of a bladder. The sensor structure includes a light source, a first fiber optic cable between the light source and the first end of the body, a light detector, and a second fiber optic cable between the light detector and the first end of the body. The amount of light received by the light detector is reduced when liquid, instead of air, is in at least some of the perforations in the body.

Abstract: A phase-locked loop and method for estimating a phase angle of a three-phase reference signal is disclosed, which includes an adaptive quadrature signal generator configured to calculate an estimated first state and an estimated second state of a model of an unbalanced three-phase system at a fundamental frequency of the reference signal on a basis of the reference signal and an estimated fundamental frequency; a reference frame transformation block configured to calculate a direct component and a quadrature component in a rotating reference frame synchronous with an estimated phase angle on a basis of the fundamental positive sequence component and the estimated phase angle, and configured to determine an estimate of an amplitude of the fundamental positive sequence component on the basis of the direct component; and an estimator configured to determine estimates of the estimated fundamental frequency and the estimated phase angle on the basis of the quadrature component.

Abstract: An exemplary power-electronic switching system has a plurality of switching units, wherein each switching unit includes a housing and at least one switching module which is arranged within the housing. A mounting unit has a holding apparatus, on which the housings of the switching units are arranged. The holding apparatus includes an insulation material for electrically insulating the holding apparatus from the housings of the switching units and the housings of the switching units from one another. The insulation material allows the housings of the switching units of the switching system to have different voltage potentials from one another and additionally can be realized in a simple and space-saving manner and easily be assembled. In addition, the housing of each switching unit includes a material for at least partially shielding an electric and magnetic field.

Abstract: A dry-type transformer heater includes a closed housing, and at least one transformer winding arranged in the housing. The at least one transformer winding includes at least one corresponding winding conductor and a corresponding insulation layer surrounding the transformer winding, respectively. In addition to the respective winding conductor, at least one coil heating wire is provided in at least one of the insulation layer and on the surface of the insulation layer to input thermal power into the respective insulation layer.

Abstract: A method for manufacturing a bipolar punch-through semiconductor device is disclosed, which includes providing a wafer having a first and a second side, wherein on the first side a high-doped layer of the first conductivity type having constant high doping concentration is arranged; epitaxially growing a low-doped layer of the first conductivity type on the first side; performing a diffusion step by which a diffused inter-space region is created at the inter-space of the layers; creating at least one layer of the second conductivity type on the first side; and reducing the wafer thickness within the high-doped layer on the second side so that a buffer layer is created, which can include the inter-space region and the remaining part of the high-doped layer, wherein the doping profile of the buffer layer decreases steadily from the doping concentration of the high-doped region to the doping concentration of the drift layer.

Abstract: A system and method are provided for configuring a clustered simulation network using virtualization. A user configures access to the main engineering personal computer (PC) being used for the plant solution, and the user configures the physical host PCs which are used for performing virtual machines containing simulators. The user selects the objects that should be simulated and based on the engineering data that the engineering PC provides, a framework application is provided to configure the required simulators, the required network interface, and the required IP addresses as well as the load balancing of the simulation tools, the required number of virtual machines which perform the simulators, and the distribution of virtual machines to the physical PCs.