Search results for "Pea method"

showing 3 items of 13 documents

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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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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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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