Abstract: A method, control system and protective relay are provided for detecting faulted phases of transmission lines in an AC power system. The method includes sampling electric signals at one end of the transmission lines at a series of time points; computing instantaneous voltage values of electric signals at compensated points on the transmission lines from the values of the sampled electric signals based on a time domain lumped parameter differential equation for the transmission lines for the series of time points; recording the computed instantaneous voltage values of the electric signals; computing fault component or sudden-change of the instantaneous voltage values of the electrical signals; detecting the faulted phases or fault types by comparing the calculated fault component of the instantaneous voltage values at the preset compensated points; and generating signals indicating the faulted phases of fault types.

Abstract: There is provided mechanisms for automatic gain control in a wireless communication network for power grid control. The wireless communication network employs time based scheduling of packets. A method is performed by a packet receiver in the wireless communication network. The method comprises receiving a packet from a packet transmitter. The packet comprises a preamble. The preamble is composed of a single OFDM symbol. The preamble is represented by a sequence of samples. The method comprises applying automatic gain control to the sequence of samples after variable gain amplitude control has been applied to the sequence of samples. The automatic gain control involves applying an LPF to the sequence of automatic gain controlled samples. The LPF is selected from a bank of LPSs. Which LPF to apply depends on, according to the time based scheduling, from which packet transmitter the packet is received.

Abstract: A power semiconductor module, including a housing; a power semiconductor chip within the housing; power terminals protruding from the housing and electrically interconnected with power electrodes of the semiconductor chip; and auxiliary terminals protruding from the housing and electrically interconnected with a gate electrode and one of the power electrodes; wherein three auxiliary terminals are arranged in a coaxial auxiliary terminal arrangement, which comprises an inner and two outer auxiliary terminals, which are arranged on opposing sides of the inner auxiliary terminal. The inner auxiliary terminal is electrically interconnected with the gate electrode or one of the power electrodes and the two outer auxiliary terminals are electrically connected with the other one of the gate electrode and the one of the power electrodes.

Abstract: A half-bridge module includes a substrate with a base metallization layer divided into a first DC conducting area, a second DC conducting area and an AC conducting area; at least one first power semiconductor switch chip bonded to the first DC conducting area and electrically interconnected with the AC conducting area; at least one second power semiconductor switch chip bonded to the AC conducting area and electrically interconnected with the second DC conducting area; and a coaxial terminal arrangement including at least one inner DC terminal. The at least first outer DC terminal and the at least one second outer DC terminal protrude from the module and are arranged in a row, such that the at least one inner DC terminal is coaxially arranged between the at least one first outer DC terminal and the at least one second outer DC terminal.

Abstract: A method for detecting fault direction of transmission line of an AC power system and control system using the same.

Abstract: The invention is concerned with a bushing for high voltage applications and a bushing arrangement including such a bushing. The bushing includes a conductor defining a longitudinal axis (A) through the bushing where the bushing has a central section and a first and a second peripheral section on opposite sides of the central section along the longitudinal axis (A) and includes an optical fibre with a first part (P1) stretching through the central section, the fibre being adapted to detect physical properties being influenced or caused by the operation of the bushing. The sections are sections of a solid condenser core and the bushing further includes an enclosure for a length of fibre that is to exit the bushing, the enclosure being buried in the central section adjacent the surface of the condenser core and having an interior.

Abstract: An apparatus includes a temperature sensor configured to measure a temperature of a dry-type transformer, and the temperature sensor is arranged on or proximate a conductor of the dry-type transformer and is covered by an insulating layer of the conductor. The apparatus further includes a passive wireless communication module configured to transmit the measured temperature to a reader. The temperature of the dry-type transformer can be measured accurately, thereby improving the reliability and safety of the dry-type transformer. Accordingly, temperature measurement for the dry-type transformer can work appropriately in a cost-effective and efficient way.

Abstract: An apparatus for heating an insulation fluid in a medium-voltage or high-voltage switchgear comprises an infrared source which is adapted to emit infrared radiation of at least one wavelength. Thus, at least one vibrational or rotational mode of at least one component of the insulation fluid is excited by absorption of at least a part of the infrared radiation, and condensation of the insulation fluid is efficiently prevented by this direct heating of the insulation fluid. A closed loop temperature regulator is used to heat only when required. A circulator in a heating chamber further provides for a mixing of the insulation fluid, thus preventing steep temperature gradients.

Abstract: The present invention generally relates to a context-aware security self-assessment method or module that determines the context in which the device is used and based on this, assesses the devices security settings. The context may refer to the system environment, the applications the device is used for, and/or the current life-cycle stage of the device, without being limited to said contexts. The method of the present invention preferably prioritizes and rates the security relevant findings and presents them in combination with mitigation options through a web interface, a configuration tool, or through notifications in the control system.

Abstract: Embodiments of the present disclosure provide a flexible conductor for connecting a main blade and a base of a disconnector. The flexible conductor includes a first portion and a second portion, the first portion is fixed to the base and adapted to bend in a first plane in response to a rotation of the main blade about a first axis; and the second portion is connected to the first portion and fixed to the main blade, the second portion adapted to bend in a second plane substantially perpendicular to the first plane in response to twisting of the main blade about a second axis; wherein the flexible conductor is operable to maintain an electrical connection between the main blade and the base when the main blade rotates and twists with respect to the base to open or close the disconnector.

Abstract: Methods and devices for a condition classification of a power network asset of a power network asset are provided. The methods and devices may combine an automatic classification procedure with a missing data replacement procedure.

Abstract: A method of an estimator of an inner control loop controlling a three-to-single-phase converter connected to an AC power grid via a transformer includes obtaining a value of a voltage reference uRef produced by the inner control loop for the converter, obtaining a value of a secondary side current produced by the converter and measured between the converter and the transformer, obtaining a value of a primary side current produced by the converter and measured between the grid and the transformer, and obtaining a value of a primary side voltage measured between the grid and the transformer. The method also includes estimating a control current iCtrl component of the primary or secondary side current iMeas which results from the voltage reference, based on the obtained values of the voltage reference, the secondary side current, the primary side current and the primary side voltage, and feeding the estimated control current iCtrl* to the inner control loop.

Abstract: The present disclosure relates to a cable for a high voltage winding of an electromagnetic induction device. The cable includes a conductor having a width w, and a shield arranged around at least a portion of the conductor, wherein in any cross-section of the conductor the conductor has rounded corners with a radius r in the range w/5<r?w/3. A high voltage electromagnetic induction device having a cable forming a high voltage winding is also disclosed.

Abstract: A method for forming an article of manufacture using additive manufacturing, includes: a processor executing program instructions to: (a) rotate an object continuously about a horizontal axis using a first rotational stage, wherein the object is partially submerged in a bath of energy curable liquid formulation during the rotation; (b) control a rate of rotation of the object to achieve a desired radial thickness of a sub layer of uncured liquid formulation at a desired rotational location on the object; (c) direct an energy source to provide an energy dose onto the object at a desired rotational location, wherein the energy dose is configured to cure and solidify the sub layer; and repeat (a), (b) and (c) until a desired radial thickness of a cured liquid formulation layer is a achieved.

Abstract: A latching device for an operating mechanism for an electrical switching apparatus. The device has a locking member movable between a first position and a second position. In the first position the locking member is arranged to lock a drive member of the operating mechanism in a locked position, and a force of the drive member being applied to a contact portion of the locking member. In the second position the locking member is arranged to release the drive member from the locked position. At least in the first position the locking member is arranged to bear against the counter roller. A tripping member is movable between a first position locking the locking member and a second position releasing the locking member. The locking member has a first portion and a second portion. The first portion is rotatable connected to a first link around a first pivot axis, which first pivot axis is movable perpendicular to its direction.

Abstract: A method for controlling a microgrid including a plurality of assets connected in the microgrid, including loads and Distributed Generators, of which DGs at least a plurality are resources capable of being controlled in a grid forming mode for controlling the voltage and frequency in the microgrid. The method includes selecting a set of resources of the plurality of resources based on the respective location within the microgrid of each of the resources in the selected set, and activating a grid forming control mode for the resources in the selected set.

Abstract: An electrical device including a cellulose based electrically insulating composite material in the form of a paper or pressboard, the composite material having cellulose fibres; and an electrically insulating thermoplastic polymer material; wherein the polymer material is arranged around and between the cellulose fibres, and binds the fibres to each other.

Abstract: A first voltage source converter and converter station including such a first voltage source converter, as well as a method and computer program product for controlling the first voltage source converter are disclosed. The first voltage source converter has a DC side for connection to a DC system, has an AC side for connection to an AC system and is interconnected with an AC side of a second voltage source converter, which has a DC side connected to the DC system. The first voltage source converter includes a number of converter valve pairs, each being connected to a corresponding AC phase of the AC system and a control unit controlling the converter valves to generate at least one AC waveform and to reduce oscillations between the converters.