Space-charge dynamic in polyethylene: from dc to ac stress

Thomas, C.; Teyssèdre, G.; Laurent, Christian

doi:10.1088/0022-3727/44/1/015401

Cited by 33 publications

(31 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These simulations are to be linked with fast space charge measurements performed by Thomas et al [31], where a fast front of positive charges is observed short after application of the voltage and negative charges are only observed once positive charges reach the counter-electrode (15 s), initiating the injection of a negative front of charges. Simulations have also been performed for the same set of parameters in the bulk, considering charge generation at the electrodes of the Schottky type:…”

Section: Bipolar Model Resultsmentioning

confidence: 80%

“…The addition of a constant source of charges and interface regions at each electrode allows having a space charge dynamic as the one observed experimentally in [31] for each kind of carrier. The parameterization of the model for the interface regions and the bulk of the dielectric remains a huge work, as no parameter (density of state, variation of this density along the interface region…) for the exponential distribution of traps at the interface is accessible by the experiment.…”

Section: Bipolar Model Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Modeling of charge injection and extraction in a metal/polymer interface through an exponential distribution of surface states

Taleb

Teyssèdre

Roy

et al. 2013

IEEE Trans. Dielect. Electr. Insul.

View full text Add to dashboard Cite

From a brief review of the literature, it is shown that surface states within dielectrics represent a critical step in charge injection whereas only scarce physical descriptions of these phenomena are available. It is confirmed from space charge measurements on low density polyethylene (LDPE) that the work function of metals used as electrodes does not correlate to injected charge quantities, thereby supporting the need for alternative descriptions of injection to the Schottky law. Hence, the influence of surface states on space charge formation in LDPE is investigated using a onedimensional model of electronic charge injection and transport under dc voltage. Transport and trapping in the bulk of the insulation are accounted for using an exponential distribution of traps with a maximum limit in trap depth. We have modeled interface states considering the same form of distribution, hypothesizing an increasing density of states and trap depth when approaching the surface. We suppose that the interface region with modulated properties extends over 1µm from both surfaces of the 200 µm thick insulation. We also considered a reservoir of charge for providing carriers into the dielectric, instead of a classical injection law. After a sensitivity analysis of model parameters on space charge results, we present simulation results on charge injection for a unipolar and a bipolar model. It is shown that the presence of surface states and the reservoir of charges could explain the particular behavior of charges observed experimentally, as regards heterocharge accumulation, and field enhancement.

show abstract

Section: Bipolar Model Resultsmentioning

confidence: 80%

Section: Bipolar Model Resultsmentioning

confidence: 99%

Modeling of charge injection and extraction in a metal/polymer interface through an exponential distribution of surface states

Taleb

Teyssèdre

Roy

et al. 2013

IEEE Trans. Dielect. Electr. Insul.

View full text Add to dashboard Cite

show abstract

“…The evolution is of the order of 10 pA, corresponding to an average internal field of the order of 0.5 kV/mm. It must be kept in mind that the thermal step signals are the image of charges stored in deep traps ("static charge" [8,9]). The measured values, close to those determined at initial state, shows that the applied electro-thermal constraints generated few space charge located in traps deep enough to retain them when the field is reverted (space charge density apparently low).…”

Section: Resultsmentioning

confidence: 99%

Dielectric properties of polyethylene terephtalate submitted to long-term thermo-electrical AC stress

Yahyaoui

Notingher

Agnel

et al. 2012

2012 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

View full text Add to dashboard Cite

In the context of improving high voltage equipment recyclability, thermoplastic polymers like polyethylene terephtalate (PET) have become attractive candidates for replacing nonrecyclable (thermosetting) insulators. In order to assess the suitability of PET for high voltage applications, its behavior under long term thermo-electrical ac stress has been investigated in the present work. Evolutions of several electrical properties of PET submitted to 9 and 15 kV/mm RMS ac fields at 80°C to 115°C during several months are presented and discussed.

show abstract

“…For a homogeneous insulator, the signal from the piezoelectric sensor in time domain vPEA(t) is given by convolution of the various transfer functions [9], [10]: where B is a constant; h(t) and g(t) are respectively the transfer function of the transducer and impulse response of sensor defined previously; dAl and vAl are respectively the thickness and velocity of sound in aluminium which constitutes the lower electrode of PEA cell. The function r(t) = (t.vs) = (z) represents the space charge density profile along the insulation thickness with vs the sound velocity in the sample.…”

Section: B Deconvolution Technique For Flat Samplesmentioning

confidence: 99%

Space Charge Measurement by Electroacoustic Method: Impact of Acoustic Properties of Materials on The Response for Different Geometries

Berquez

Teyssèdre

2018

IJEEI

View full text Add to dashboard Cite

The pulsed electro-acoustic method (PEA) allows dynamic measurements of space charge density distribution with good temporal resolution and is suitable for both flat samples (a few hundred micrometers thickness) and coaxial cable samples. The response obtained by the technique is tributary to the electro-mechanical properties of the materials through which acoustic waves propagate. Hence, when dealing with multilayer dielectrics, the acoustic properties of individual layers are to be taken into account. Also, the acoustic attenuation and dispersion phenomena, especially when dealing with relatively thick samples, affect the space charge resolution at positions far away from the sensor. Therefore, application of a calibration procedure on experimental signals is necessary to recover space charge density profile from PEA raw signals and to provide real results on charge density both on its temporal and spatial dependence. We illustrate here in different samples configurations, spanning from flat samples, multi-layer and cable geometry, how the calibration is achieved and how the acoustic properties of materials impart the response.

show abstract

Space-charge dynamic in polyethylene: from dc to ac stress

Cited by 33 publications

References 20 publications

Modeling of charge injection and extraction in a metal/polymer interface through an exponential distribution of surface states

Modeling of charge injection and extraction in a metal/polymer interface through an exponential distribution of surface states

Dielectric properties of polyethylene terephtalate submitted to long-term thermo-electrical AC stress

Space Charge Measurement by Electroacoustic Method: Impact of Acoustic Properties of Materials on The Response for Different Geometries

Contact Info

Product

Resources

About