Search results for "trol"

showing 10 items of 16682 documents

Measurements on partial discharge in on‐site operating power transformer: a case study

2018

This study presents the case study of a substation in-service power transformer referred to the on-site partial discharge (PD) detection and evaluation methods. An original methodology for simultaneous application of three methods is proposed: electrical, acoustic and ultra-high frequency. Transformer is powered by the power grid and no external generator is required according to the proposed methodology. Furthermore, several possibilities of applying these concurrent measurements and benefits of such solution in terms of result interpretation, interference resistance and on-site measurement applicability are indicated. The proposed methodology allows for a fast, accurate and secure PD diag…

010302 applied physicsComputer science020209 energyEnergy Engineering and Power TechnologyHigh voltage02 engineering and technologycomputer.software_genre01 natural sciencesExpert systemlaw.inventionUltra high frequencyControl and Systems Engineeringlaw0103 physical sciencesEvaluation methodsPartial discharge0202 electrical engineering electronic engineering information engineeringElectronic engineeringPower gridElectrical and Electronic EngineeringTransformerInterference resistancecomputerIET Generation, Transmission & Distribution
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A General Mathematical Formulation for the Determination of Differential Leakage Factors in Electrical Machines with Symmetrical and Asymmetrical Ful…

2018

This paper presents a simple and general mathematical formulation for the determination of the differential leakage factor for both symmetrical and asymmetrical full and dead-coil windings of electrical machines. The method can be applied to all multiphase windings and considers Gorges polygons in conjunction with masses geometry in order to find an easy and affordable way to compute the differential leakage factor, avoiding the adoption of traditional methods that refer to the Ossanna's infinite series, which has to be obviously truncated under the bound of a predetermined accuracy. Moreover, the method described in this paper allows the easy determination of both the minimum and maximum v…

010302 applied physicsComputer scienceconcentrated winding020208 electrical & electronic engineering02 engineering and technologySettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciTopology01 natural sciencesdifferential leakage factorIndustrial and Manufacturing EngineeringHarmonic analysismoment of inertiaControl and Systems EngineeringElectromagnetic coil0103 physical sciences0202 electrical engineering electronic engineering information engineeringElectrical and Electronic EngineeringAsymmetrical windingdead-coil windingGörges polygonmultiphase windingsLeakage (electronics)
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Piecewise Affine (PWA) Modeling and Switched Damping Control of Two-Inertia Systems with Backlash

2018

Backlash degrades positioning accuracy and can induce mechanical wear and breakage by collisions. Therefore, a lot of studies have been conducted on backlash compensation. The simplest control method for the impact attenuation is torsional damping addition by feedback of torsional velocity. This paper reveals the advantages and disadvantages of the torsional damping addition. Based on the analyses, a novel switched damping control is proposed to realize the responses with smaller overshoot while attenuating the impact. The mechanical system and the proposed controller are described as piecewise affine systems for analyses. The performance of the proposed method is compared with a linear dam…

010302 applied physicsComputer sciencemedia_common.quotation_subjectAttenuation020208 electrical & electronic engineeringControl (management)02 engineering and technologyInertia01 natural sciencesCompensation (engineering)Mechanical systemControl theory0103 physical sciences0202 electrical engineering electronic engineering information engineeringOvershoot (signal)Backlashmedia_common
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Determination of differential leakage factors in electrical machines with non-symmetrical full and dead-coil windings

2017

In this paper Gorges polygons are used in conjunction with masses geometry to find an easy and affordable way to compute the differential leakage factor of non symmetrical full and dead coil winding. By following the traditional way, the use of the Ossanna's infinite series which has to be obviously truncated under the bound of a predetermined accuracy is mandatory. In the presented method no infinite series is instead required. An example is then shown and discussed to demonstrate practically the effectiveness of the proposed method.

010302 applied physicsConcentrated windingSettore ING-IND/32 - Convertitori Macchine E Azionamenti Elettrici01 natural sciencesDifferential leakage factorwindingsmoment of inertiaControl theoryElectromagnetic coil0103 physical sciencesunsymmetrical windingGörges polygonLeakage (electronics)Mathematics
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Maximum Torque Per Ampere control algorithm for low saliency ratio interior permanent magnet synchronous motors

2017

This paper presents an investigation on the comparison between the Maximum Torque Per Ampere (MTPA) and the Field Orientation Control (FOC) algorithms for interior permanent magnet synchronous machines (IPMSMs). In particular, this study was carried out on a small-power IPMSM with low salience ratio. Both control algorithms have been implemented in the Matlab/Simulink environment, obtaining promising results.

010302 applied physicsControl algorithmMaximum torque per ampere control algorithmPermanent magnet synchronous motorComputer scienceRenewable Energy Sustainability and the Environment020208 electrical & electronic engineeringEnergy Engineering and Power Technology02 engineering and technologySettore ING-IND/32 - Convertitori Macchine E Azionamenti Elettrici01 natural sciencesField oriented control algorithmField orientationSalience (neuroscience)Control theoryMagnet0103 physical sciences0202 electrical engineering electronic engineering information engineeringInterior permanent magnet synchronous machineMATLABAmperecomputerMaximum torquecomputer.programming_language
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Pulsed Electro-Acoustic Method for specimens and cables employed in HVDC systems: Some feasibility considerations

2018

Recent experiments on the use of the PEA method for testing dielectric materials in specimens and comparison with a detailed model provide an insight of the phenomenon and suggest the need of adopting similar models also for cables. What is said is even more important considering the possible future adoption of the PEA methodology to test DC cables for Pre-Qualification and Type Tests. The use of an accurate model of the PEA cell used for testing specimens and related experiments prove that the thickness of the different parts composing the PEA setup is a basic element for providing accurate charge reading and interpretation of the phenomenon. Both simulation and experimental results, carri…

010302 applied physicsControl and OptimizationComputer science020209 energySample (material)Issues in PEA measurementMechanical engineeringEnergy Engineering and Power Technology02 engineering and technologyAcoustic wave01 natural sciencesSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaSettore ING-IND/31 - ElettrotecnicaPulsed Electro-Acoustic methodComputer Networks and Communication0103 physical sciencesReflection phenomenon0202 electrical engineering electronic engineering information engineeringDC cableCharge accumulation
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Guest Editorial

2019

Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART²

010302 applied physicsControl and Systems Engineering0103 physical sciencesMaterials ChemistryCeramics and Composites02 engineering and technologyElectrical and Electronic Engineering021001 nanoscience & nanotechnology0210 nano-technologyCondensed Matter Physics01 natural sciencesElectronic Optical and Magnetic MaterialsIntegrated Ferroelectrics
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Experimental Equipment for Studying the Residual Stresses Developed During High Temperature Reactions by X-Ray Diffraction

1996

This paper describes a device dedicated to studyng, by X-ray diffraction the residual stresses developed on surface samples as a function of temperature and atmosphere conditions. The setup consists of : a.) an horizontal axis goniometer which allows the programmed positionning of the sealed X-ray source and of the linear detector. b.) a high temperature controlled atmosphere chamber Particular attention has been paid to the thermal stability up to 1200°C and the accurate position on the sample.

010302 applied physicsDiffractionControlled atmosphereChemistrybusiness.industryDetectorGeneral Physics and Astronomy02 engineering and technology021001 nanoscience & nanotechnology01 natural sciencesAtmosphereOpticsResidual stressGoniometer[PHYS.HIST]Physics [physics]/Physics archives0103 physical sciencesX-ray crystallographyThermal stability0210 nano-technologybusiness
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Effect of Cu doping on Ba0.95Pb0.05TiO3 electrical properties studied by means of electrical impedance spectroscopy

2019

The ceramics of 0.95BaTiO3–0.05PbTiO3+Xwt.%CuO (X = 0.05, 0.1, 1, 3) were prepared by a solid phase reaction. The structural and morphology studies were carried out by means of X-ray diffraction te...

010302 applied physicsDiffractionPhase reactionMaterials scienceMorphology (linguistics)Analytical chemistry02 engineering and technology021001 nanoscience & nanotechnologyCondensed Matter Physics01 natural sciencesElectronic Optical and Magnetic MaterialsControl and Systems EngineeringCu dopingvisual_art0103 physical sciencesMaterials ChemistryCeramics and Compositesvisual_art.visual_art_mediumCeramicElectrical and Electronic Engineering0210 nano-technologyElectrical impedance spectroscopyIntegrated Ferroelectrics
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Investigation and reduction of losses on inverter-fed induction motors

2017

An electric motor is more effective and flexible when supplied by a frequency converter. The frequency converter not only produces the fundamental voltage but also a set of higher harmonics which cause additional losses in the motor. Losses in the frequency converter are normally neglected in the drive dimensioning due to insufficient data available from manufacturers. Motor's losses can be reduced by increasing the switching frequency of frequency converters. An increase of the switching frequency may result in higher losses in the frequency converter. This work investigates analytically and experimentally the dependence of the losses of modern motor and frequency converter on a switching …

010302 applied physicsElectric motorEngineeringbusiness.industry020208 electrical & electronic engineering02 engineering and technologyConverters01 natural sciencesPower (physics)Power ratingControl theoryHarmonics0103 physical sciences0202 electrical engineering electronic engineering information engineeringInverterbusinessInduction motorVoltage2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE Europe)
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