Abstract: Technologies for solar power system performance model tuning are disclosed. In at least one illustrative embodiment, a method of tuning a system performance model for a power plant may comprise estimating an expected output of an inverter of the power plant using the system performance model, obtaining a measured output of the inverter, determining whether a difference between the expected and measured inverter outputs is within a predefined range, and tuning the system performance model using the difference in response to determining that the difference is within the predefined range. The power plant may further comprise at least one solar panel array, and the inverter may be electrically coupled to the at least one solar panel array.

Abstract: The present invention relates to estimating source impedances across one or more transmission lines connecting at least two substations. Each substation is associated with an equivalent source having a respective source impedance. Voltage and current measurements and status signals are obtained. The voltage and current measurements provide terminal or bus voltages and line currents at each terminal, and the status signals are associated with switching events at the one or more transmission lines or at the substations. An event associated with a disturbance or current injection is detected from one or more of the obtained measurements and the obtained status signals. The source impedance of each equivalent source is estimated based on the event, using line parameters and the voltage and current measurements associated with the event.

Abstract: A coil for a transformer core comprises a longitudinal axis, at least one multi-stranded conductor, at least one first conductor turn wound around the longitudinal axis, at least one second conductor turn wound around the longitudinal axis, the at least one first conductor turn being adjacent the at least one second conductor turn. Each of the at least one first and second conductor turns is provided with an electrically insulating member which extends about part but not an entire cross-sectional perimeter of the respective conductor turn, such that the at least one first and second conductor turns are insulated against each other. The electrically insulating member does not extend the entire cross-sectional perimeter of the respective conductor turn.

Abstract: A support for mounting an accessory equipment assembly with one or more accessory equipment units, such as current transformer units, to a base of a bushing includes a conductor surrounded by an insulator part such that each of the accessory equipment units is positioned in a defined way regarding the conductor, wherein said support includes aligning means for aligning each individual accessory equipment unit separately with respect to the conductor. A corresponding accessory equipment module includes an accessory equipment assembly with one or more accessory equipment units, such as current transformer units, and a support for mounting the accessory equipment assembly as well as a bushing unit including a bushing and said kind of accessory equipment module.

Abstract: A flange for an electrical bushing is specified, comprising a lower part and an upper part configured to be mechanically affixed to one another, wherein the lower part and the upper part are arranged one above the other in an axial direction of the flange, and one of the lower part and the upper part surrounds a portion of the other one of the lower part and the upper part at least in regions in a radial direction, thereby forming a positive connection against relative movement of the upper part with respect to the lower part in a non-axial direction of the flange. Furthermore, an electrical bushing is specified.

Abstract: Embodiments are disclosed for predicting, by a processor circuit, a load parameter value of an electrical equipment for a future time based on at least one machine learning model and multiple load parameter values including a set of predefined number of load parameter values extracted from a time series data stream of load parameter values obtained for the electrical equipment. Thereafter calculating, by the processor circuit, an overload capability for the future time based on the predicted load parameter value and changing, by the processor circuit, at least one parameter associated with the electrical equipment at the present time based on the calculated overload capability for the future time.

Abstract: A method can be used to control a voltage source converter of a power supporting arrangement to act as a virtual synchronous machine. The method includes obtaining a measured power level of the converter, processing the measured power level using a differential equation of an angular velocity of the virtual synchronous machine in order to obtain a control contribution, providing a phase angle of a physical quantity used to control the converter based on the control contribution, monitoring the ability of the converter to act as a virtual synchronous machine, determining that the ability of the converter to act as a virtual synchronous machine is deemed insufficient, and adjusting the control contribution by increasing the damping term and/or decreasing the moment of inertia term in response to determining that the ability of the converter to act as a virtual synchronous machine is deemed insufficient.

Abstract: A semiconductor component, including a support frame and at least one semiconductor module attached to the support frame, wherein the support frame includes a respective passage (on the edge of which a base plate of the semiconductor module rests, wherein the base plate is soldered to the support frame.

Abstract: An integrated gate-commutated thyristor (IGCT) includes a semiconductor wafer having a first main side and a second main side opposite to the first main side and a plurality of first type thyristor cells and second type thyristor cells. The cathode electrode of the first type thyristor cells forms an ohmic contact with the cathode region and the cathode electrode of the second type thyristor cells is insulated from the cathode region. A predefined percentage of second type thyristor cells of the overall amount of first type thyristor cells and second type thyristor cells in a segment ring is greater than 0% and less than or equal to 75%.

Abstract: The present disclosure provides a contact actuating unit for an electrical circuit breaker. The contact actuating unit includes an electro-mechanical device. An actuator of the electro-mechanical device is connected to a contact arrangement in the electrical circuit breaker. The contact actuating unit further comprises a control unit. The control unit is configured to control the electro-mechanical device to move the actuator and to bring the contact arrangement from a first to a second position. The contact actuating unit further includes a command feed forward or motion trajectory and feed forward controller, configured to provide one or more data signals. At least one of the provided data signals is indicative of a predetermined force and/or torque value, adapted to command the control unit to move the contact arrangement with the actuator to a predetermined position.

Abstract: Embodiments of the present disclosure relate to a power equipment and method for providing the same. Embodiments of the present disclosure relate to a power equipment. The power equipment includes a high voltage part, a low voltage part, and an insulation oil adapted to impregnate the high voltage part and insulate the high voltage part from the low voltage part. The insulation oil is partially filled with polymer particles with a lower thermal expansion coefficient than the insulation oil.

Abstract: A tower mounted high voltage gas-insulated switchgear including a supporting structure connected to the lattice structure of a high voltage transmission tower, a first and a second combined interruption and disconnection modules respectively including for each phase, a first and a second combined interruption and disconnection units, a first combined disconnecting and earthing switch having a first fixed contact operatively coupled to said first terminal, a second fixed contact at ground potential and a first movable contact operatively couplable to said first and second fixed contacts for disconnecting and earthing operations; a fast earthing switch interposed between said first fixed contact and said first terminal, a circuit breaker unit electrically connected to said first movable contact of said first combined disconnecting and earthing switch and to a second combined disconnecting and earthing switch.

Abstract: A composite insulator includes an insulating elongated core, a protective layer surrounding the elongated core, the protective layer including an outer surface with a shed profile and an adhesive primer layer disposed between the elongated core and the protective layer for adhering the protective layer to the elongated core, the adhesive primer layer including a coupling agent and particles of a low resistivity material. The method for producing a composite insulator includes preparing a first solution including a solvent, a coupling agent and particles of a low resistivity material, applying the first solution on at least a part of an envelope surface of an insulating elongated core and thus forming one or more first adhesive primer layers and applying a protective layer onto the first adhesive primer layer on the elongated core, wherein the protective layer includes an outer surface with a shed profile.

Abstract: To perform a prognostic health analysis for an asset, a plurality of independent stochastic simulations are performed using transition probabilities of a discrete Markov Chain model. A prognostic asset health state evolution is computed over a time horizon from the plurality of independent stochastic simulations. An output is generated based on the computed prognostic asset health state evolution.

Abstract: An electrical bushing having an anti-rotation mounting flange for preventing rotation of a body element of the electrical bushing is provided. The electrical bushing includes a mounting flange, at least one locking element and a body element having a circumferential protrusion. At least one first recess is formed in the circumferential protrusion, and the at least one locking element is configured to engage with the at least one first recess and with the mounting flange for restricting relative rotation of the body element relative to the mounting flange about a longitudinal axis R. A further aspect provides an electrical transformer including at least one electrical bushing according to the above. A yet further aspect provides a method for mounting the electrical bushing according to the above.

Abstract: An electrical interconnection circuit can be used with a solid-state-transformer (SST) system. The interconnection circuit includes medium voltage direct current (MVDC) to low voltage direct current (LVDC) direct current to direct current (DC/DC) converters, independent LVDC buses respectively connected to one of the MVDC to LVDC DC/DC converters, and an interconnecting DC/DC converter connecting at least two of the independent LVDC buses in order to ensure equal power demand from each MVDC to LVDC DC/DC converters. The interconnecting DC/DC converter is configured to re-route power between the plurality of independent LVDC buses. A power rating of the interconnecting DC/DC converter is set according to power to be rerouted from other LVDC buses via the interconnecting DC/DC converter.

Abstract: Examples of fault location in a power transmission line connecting a first and a second terminal is described. In an example, arrival times of a first peak, a second peak, and a third peak of a travelling wave detected from measurements carried out at the first and second terminals is detected. A rise time associated with the first peak of the travelling wave is calculated. One of a first half and a second half of the power transmission line is identified, as having a fault, based on a comparison of the rise time. One of a first segment, a second segment, a third segment, and a fourth segment of the power transmission line is identified as having the fault. Length of the power transmission line is estimated. The fault location is estimated based on identification of one of the first, second, third, and fourth segments as having the fault.

Abstract: A transformer arrangement includes a first and a second arrangement side and a transformer with first windings coupled to the first arrangement side and with second windings having a first to a fourth tap. The transformer arrangement comprises a converter coupling the first, second and third tap to the second arrangement side, a first filter circuit coupling the first tap to the third tap and a second filter circuit coupling the third tap to the second tap.

Abstract: A gas insulated surge arrester is disclosed, including a metal clad housing within which a block stack is arranged. The block stack includes at least one metal-oxide resistor column and the gas insulated surge arrester is characterized by a capacitive element arranged to obtain an electric field measurement of the gas insulated surge arrester; and by a bushing arranged through the metal clad housing and arranged to the provide a capacitive third-order harmonic current measurement to an input of a surge arrester monitoring device. A monitoring system is also provided, including a gas insulated surge arrester connected to a surge arrester monitoring device.

Abstract: In at least one embodiment, the liquid circulation system comprises a rotor located within a tank, a stator having a plurality of coils outside the tank, and an exterior tank wall that is non-magnetic and that is located next to the rotor and between the rotor and the stator, wherein an axis (R) of rotation of the rotor is in parallel with the exterior tank wall, the coils of the stator are arranged along the axis (R) of rotation of the rotor so that the rotor is configured to be rotated by the stator in a touchless manner through the exterior tank wall by means of a varying electromagnetic field driven by the stator to circulate a liquid within the tank.