Search results for "Pea method"

showing 10 items of 13 documents

Space charge behavior of different insulating materials employed in AC and DC cable systems

2017

In this work, the space charge accumulation in three different XLPE based material has been carried out by using the PEA (Pulsed Electro-Acoustic) method. The specimens provided by a cables industry have been subjected to the same DC stress during polarization time at environment temperature. Afterwards, the high voltage generator has been turned off and the amount residual charge has been evaluated. The space charge profiles during polarization and depolarization have been carried out and compared. Finally, the distribution of electric field within the samples has been reported. In particular, the maximum distortion of electric field has been calculated by taking into account the distribut…

010302 applied physicsHvdcMaterials scienceCondensed matter physics020209 energyDepolarizationHigh voltage02 engineering and technologyDC stre01 natural sciencesSpace chargeSpace chargeElectronic Optical and Magnetic MaterialsSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaSettore ING-IND/31 - ElettrotecnicaPea methodElectric field0103 physical sciencesResidual charge0202 electrical engineering electronic engineering information engineeringAdditiveElectrical and Electronic EngineeringPolarization (electrochemistry)2017 International Symposium on Electrical Insulating Materials (ISEIM)
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Space Charge Measurement under DC and DC Periodic Waveform

2018

In High Voltage systems, Partial Discharges (PDs) monitoring are one of the main diagnostic instrument to evaluate the reliability of the apparatus. Under Alternating Current (AC) stress, PDs detection and recognition techniques are well consolidated. On the contrary, the monitoring of PDs under Direct Current (DC) stress is difficult due to complexities related to the nature of the phenomenon, which cause the beginning of PDs events in proximity of the dielectric breakdown. This problem has been partially overcome by using a continuous Periodic waveform (DCP) with positive average value, as described in a recent published work. Under DC stress, another degradation factor is the Space Charg…

010302 applied physicsMaterials scienceDielectric strengthPEA methodElectronic Optical and Magnetic MaterialDirect currentHigh voltageDC stre01 natural sciencesSpace chargeSpace chargelaw.inventionComputational physicsStress (mechanics)Settore ING-IND/31 - ElettrotecnicaDCP strelawDCP waveform0103 physical sciencesWaveformElectrical and Electronic Engineering010306 general physicsAlternating currentVoltage
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The Acoustic Wave Behavior Within the PEA Cell for Space Charge Measurement

2018

In order to evaluate the acoustic wave behavior within the Pulsed Electro Acoustic (PEA) cell, a simulation model has been developed in this work. The model, implemented in Matlab environment, is based on the analogy between acoustic and electrical quantities. Therefore, it was possible to model the PEA cell as cascade connected lossy transmission lines. The model has been validated theoretically by making a comparison with a simulation result found in literature. The experimental validation has also been made by using the PEA cell of the LEPRE high voltage lab. In addition, four graphs have been realized. Two of them can be used to establish in easy and fast way to obtain the minimum groun…

010302 applied physicsPhysics021103 operations researchPEA methodAcousticsElectronic Optical and Magnetic Material0211 other engineering and technologiesPEA modelHigh voltage02 engineering and technologyAcoustic wave01 natural sciencesSignalSpace chargeSettore ING-IND/31 - ElettrotecnicaCascade0103 physical sciencesElectrodeReflection phenomenonReflection (physics)Electrical and Electronic EngineeringMATLABcomputercomputer.programming_language
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The Role of Right Interpretation of Space Charge Distribution for Optimized Design of HVDC Cables

2019

In the field of high-voltage transmission systems, different degradation phenomena affect the reliability of the employed components. In particular, under dc stress, the space charge accumulation phenomenon is believed to be the most responsible of the dielectrics lifetime reduction. To measure the accumulated space charges in flat specimens, the pulsed electro-acoustic (PEA) method is one of the most used techniques. The working principle of the PEA cell is based on the acoustic waves propagation and detection. As is well known, the acoustic waves propagating in different means are partially transmitted and partially reflected. Therefore, the piezoelectric sensor of the PEA cell is subject…

010302 applied physicsPhysicsField (physics)Piezoelectric sensorPEA method020208 electrical & electronic engineeringhigh-voltage direct-current (HVdc)Charge (physics)modeling02 engineering and technologyMechanicsAcoustic wave01 natural sciencesSpace chargeSignalFinite-difference time-domain (FDTD) methodIndustrial and Manufacturing EngineeringSettore ING-IND/31 - ElettrotecnicaControl and Systems Engineering0103 physical sciences0202 electrical engineering electronic engineering information engineeringReflection (physics)space chargeSurface chargeElectrical and Electronic Engineering
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Acoustic Wave Behavior in a Specimen Containing an Air Void Defect

2019

The PEA method is the most used technique for the space charge measurements. As is well known, this method uses pressure waves to detect the charges accumulated in solid dielectrics. Based on its working principle, the generated acoustic waves travel within PEA cell and the specimen under test in order to be finally detected by the piezoelectric sensor. For a multilayer specimen and, in particular, in case of different materials that make up the specimen, the acoustic wave reflection is inevitable. Considering that, in several cases, the reflected waves could be detected by the piezoelectric sensor before than the main signals, the PEA cell output profile could results distorted. Based on t…

010302 applied physicsVoid (astronomy)Materials sciencePiezoelectric sensorPEA method020209 energyAcousticsReflected wavesair void02 engineering and technologyAcoustic waveDielectric01 natural sciencesSpace chargeSpace chargeKaptonreflection phenomenonSettore ING-IND/31 - ElettrotecnicaMultilayer specimen0103 physical sciences0202 electrical engineering electronic engineering information engineering
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Effect of Acoustic Wave Reflections on Space Charge Measurements with PEA Method

2018

The Pulsed Electro-Acoustic (PEA) method is the most used technique for space charge detection in solid dielectrics. The methodology is largely employed in the field of High Voltage Direct Current (HVDC) transmission and is based on the detection of acoustic waves generated by charges vibration. One of the most common problems arising during the detection is the presence of multiple reflections taking place due to the presence of means discontinuity in the different PEA cell components. This reflection phenomenon, if not well taken into account, could cause incorrect interpretation of the PEA output signal. It is easy to understand that a simulation model is a basic tool to understand the w…

PhysicsPEA methodRenewable Energy Sustainability and the EnvironmentNumerical analysisAcousticsPEA modelEnergy Engineering and Power TechnologyComputer Science Applications1707 Computer Vision and Pattern RecognitionAcoustic waveDielectricsimulationSpace chargeIndustrial and Manufacturing EngineeringVibrationSettore ING-IND/31 - ElettrotecnicaComputer Networks and CommunicationTransduceracosutic waveArtificial IntelligenceHigh-voltage direct currentMATLABInstrumentationcomputercomputer.programming_language2018 IEEE 4th International Forum on Research and Technology for Society and Industry (RTSI)
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Modelling of Pulsed Electro Acoustic Method for Space Charge Detection on Single and Multilayer Dielectrics

Space charge PEA method Simulation Modelling Dielectric Multilayer HVDC.
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Reliability of PEA Measurement in Presence of an Air Void Defect

2020

This paper deals with the reliability of the Pulsed Electro-Acoustic (PEA) technique in the case of a specimen containing an air layer. The first approach to this study has been proposed by the authors in previously published works. In these papers, the mathematical description, the PEA cell simulation model, and some experimental tests have been reported. In this work, a more accurate description of the acoustic wave behavior within the PEA cell and specimen with and without an air layer is given. Moreover, the comparison between simulation and experimental tests for both cases (specimen with and without air layer) allowed the validation of the previously developed PEA cell simulation mode…

Void (astronomy)Control and OptimizationMaterials sciencePEA method020209 energyair voidEnergy Engineering and Power Technology02 engineering and technologyDielectriclcsh:Technology01 natural sciencesAir layer0103 physical sciences0202 electrical engineering electronic engineering information engineeringElectrical and Electronic EngineeringComposite materialEngineering (miscellaneous)Space charge HVDC air void PEA method multilayer010302 applied physicsHVDCmultilayerlcsh:TRenewable Energy Sustainability and the EnvironmentAcoustic waveSpace chargeSettore ING-IND/31 - Elettrotecnicaspace charge; HVDC; air void; PEA method; multilayerspace chargeAcoustic impedanceSingle layerEnergy (miscellaneous)Energies
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Interpretation of PEA Output Signal in a Multilayer Specimen

2018

The aim of the present work is to evaluate the acoustic waves behavior within the Pulsed Electro-Acoustic (PEA) cell, in case of a multilayer specimen, in order to avoid misinterpretation of the output signal. Due to the reflection phenomenon of the acoustic waves travelling within the PEA cell, the output signal could be distorted. Because this aspect, for a given PEA cell with certain ground electrode and absorber thicknesses, depends on the sound velocity and thickness of the specimen under test, the latter must be carefully sized. For this aim, some useful relationships, that must be taken into account are given and described. In particular, a three layers sample simulating an air void …

Void (astronomy)Materials sciencePEA method020209 energyAcousticsElectronic Optical and Magnetic Material02 engineering and technologyAcoustic waveDielectricSpace chargeSpace chargeSettore ING-IND/31 - ElettrotecnicaMultilayer specimenElectrodeReflection phenomenon0202 electrical engineering electronic engineering information engineeringElectrical and Electronic Engineering
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Different Space Charge Behavior of Materials Used in AC and DC Systems

2017

The aim of the present work is to evaluate the behavior, from the space charge accumulation phenomenon point of view, of three different XLPE specimens used as insulation materials in high voltage systems. Considering that under DC stress the charge accumulation is more relevant as compared to the AC case, in the specimens for DC applications additives are typically added. In this work, three different specimens are analyzed. One is a free additive sample used conventionally under AC stress and two others include different additives that are used under DC stress. In order to measure the space charge accumulation, the Pulsed Electro Acoustic (PEA) method has been employed. For each sample, t…

Work (thermodynamics)Materials sciencePEA method020209 energy02 engineering and technology01 natural sciencesSpace chargelaw.inventionStress (mechanics)lawElectric field0103 physical sciences0202 electrical engineering electronic engineering information engineeringPoint (geometry)AdditiveElectrical and Electronic EngineeringComposite material010302 applied physicsElectronic Optical and Magnetic MaterialCharge (physics)High voltageDC streSpace chargeCathodeSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaSettore ING-IND/31 - Elettrotecnica2017 IEEE Conference on Electrical Insulation and Dielectric Phenomenon (CEIDP)
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