Search results for "Pea method"

showing 10 items of 13 documents

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)
researchProduct

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)
researchProduct

The Industrial Applicability of PEA Space Charge Measurements, for Performance Optimization of HVDC Power Cables

2019

Cable manufacturing industries are constantly trying to improve the electrical performance of power cables. During the years, it was found that one of the most relevant degradation factors influencing the cable lifetime is the presence of space charge in the insulation layer. To detect the accumulated charge, the pulsed electro-acoustic (PEA) method is the most used technique. Despite the wide use of the PEA cell, several issues are still present. In particular, the PEA output signal is strongly disturbed by the acoustic waves reflections within the PEA cell. This causes the distortion of the output signal and therefore the misinterpretation of the charge profiles. This, in turn, may result…

space charge; PEA method; PEA cell model; IEEE Std 1732; space charge in cablespea methodControl and OptimizationMaterials science020209 energyAcousticsEnergy Engineering and Power Technology02 engineering and technologylcsh:Technology01 natural sciencesSignalpea cell modelieee std 1732Distortion0103 physical sciences0202 electrical engineering electronic engineering information engineeringspace charge in cablesElectrical and Electronic EngineeringEngineering (miscellaneous)010302 applied physicslcsh:TRenewable Energy Sustainability and the EnvironmentAttenuationHigh voltageAcoustic waveSpace chargePower (physics)Settore ING-IND/31 - ElettrotecnicaReflection (physics)space chargeEnergy (miscellaneous)Energies
researchProduct

A new approach to calibrate the thermal conditions in space charge measurements on HVDC mini-cables

2019

The PEA method is currently widespread used for space charge measurements in mini-cables in order to qualify the behavior of semicon-dielectric-semicon compound under electric and thermal stress. The main goal of this research is to quantitatively evaluate the relationship between the thermal boundary conditions applied to cables or mini-cables and the maximum local electric field due to the accumulated space charge. Hitherto, several research groups have obtained thermal gradients over the dielectric's radius heating the conductor by Joule effect due to an induced current. In this paper, a numerical approach is offered to calibrate the heat exchange boundary conditions to apply to a sample…

mini-cable sample010302 applied physicsMaterials sciencePEA method020209 energyJoule effect02 engineering and technologyMechanicsDielectric01 natural sciencesSpace chargeSpace chargeConductorSettore ING-IND/31 - ElettrotecnicaElectric field0103 physical sciencesThermal0202 electrical engineering electronic engineering information engineeringthermal gradientBoundary value problemElectrical conductorHVDC cable2019 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)
researchProduct

Modelling of Pulsed Electro Acoustic Method for Space Charge Detection on Single and Multilayer Dielectrics

Space charge PEA method Simulation Modelling Dielectric Multilayer HVDC.
researchProduct

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
researchProduct

Different Measurement Setup Configurations for Space Charge test in Mini Cable Specimens with the PEA Method

2019

Under DC stress, the space charge accumulation is believed one of the most responsible of dielectrics ageing. For this reason, due to the increase of the HVDC transmission, a recommendation has been proposed. The latter want to introduce the space charge measure, with the PEA method, in cable specimens during the prequalification or type tests. Considering the several issues related to this kind of measures the aim of the proposed work is find a measurement setup for mini cable specimens which is able to provide a clear and clean space charge profile. Therefore, different tests have been made in this work. In particular, the length of the cable specimen, the width of the pulse electrodes, a…

mini cable010302 applied physicsMaterials sciencePEA method020209 energyAcoustics02 engineering and technology01 natural sciencesMeasure (mathematics)Space chargeSpace chargePulse (physics)Stress (mechanics)Settore ING-IND/31 - ElettrotecnicaLength measurementCable specimenPEA for cableTransmission (telecommunications)Position (vector)0103 physical sciencesElectrode0202 electrical engineering electronic engineering information engineering2019 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)
researchProduct

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
researchProduct

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)
researchProduct

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
researchProduct