Maxwell–Wagner Effect in Multi-Layered Dielectrics: Interfacial Charge Measurement and Modelling

Vu, Thi Thu Nga; Teyssèdre, G.; Roy, Séverine Le; Laurent, Christian

doi:10.3390/technologies5020027

Cited by 54 publications

(32 citation statements)

References 25 publications

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“…However, space charges are inclined to accumulate at the interface in the composite insulation system consisting of different dielectrics, like the HVDC cable accessory, which will then distort the partial electrical field, cause discharge along the interface, and induce dielectric breakdown in the HVDC cable system [5,6]. Vu et al considered that the interface charge was produced by the Maxwell–Wagner polarization in the bilayer insulation [7]. There have also been many papers reporting that the surface state and interface barrier have strong correlation with the accumulation of the interface charge [8,9].…”

Section: Introductionmentioning

confidence: 99%

Surface Layer Fluorination-Modulated Space Charge Behaviors in HVDC Cable Accessory

et al. 2018

Polymers

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Space charges tend to accumulate on the surface and at the interface of ethylene–propylene–diene terpolymer (EPDM), serving as high voltage direct current (HVDC) cable accessory insulation, which likely induces electrical field distortion and dielectric breakdown. Direct fluorination is an effective method to modify the surface characteristics of the EPDM without altering the bulk properties too much. In this paper, the surface morphology, hydrophobic properties, relative permittivity, and DC conductivity of the EPDM before and after fluorination treatment were tested. Furthermore, the surface and interface charge behaviors in the HVDC cable accessory were investigated by the pulsed electroacoustic (PEA) method, and explained from the point of view of trap distribution. The results show that fluorination helps the EPDM polymer obtain lower surface energy and relative permittivity, which is beneficial to the interface match in composite insulation systems. The lowest degree of space charge accumulation occurs in EPDM with 30 min of fluorination. After analyzing the results of the 3D potentials and the density of states (DOS) behaviors in EPDM before and after fluorination, it can be found that fluorination treatment introduces shallower electron traps, and the special electrostatic potential after fluorination can significantly suppress the space charge accumulation at the interface in the HVDC cable accessory.

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Section: Introductionmentioning

confidence: 99%

Surface Layer Fluorination-Modulated Space Charge Behaviors in HVDC Cable Accessory

et al. 2018

Polymers

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“…In case of multi-layer dielectric, much more charges are detected, one of the reasons being the presence of the interface. The analysis of the charge build and charge decay, considering amount, sign, and kinetic is proposed elsewhere [20,23]. A pretty good agreement was obtained between results obtained by conductivity measurements and space charge build-up, i.e.…”

Section: Deconvolution Technique In the Case Of Bilayer Materialsmentioning

confidence: 83%

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

Berquez

Teyssèdre

2018

IJEEI

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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.

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“…This means that the field excess can be exerted for a significant part of the life of the cable. In accessories such as joints and terminations, that exhibit more complex geometries and involve the association of dielectrics of different nature, a similar approach is to be developed, in non-stationary conditions, in order to identify hot points in field and anticipate their occurrence in time and space [48].…”

Section: Discussionmentioning

confidence: 99%

DC Model Cable under Polarity Inversion and Thermal Gradient: Build-Up of Design-Related Space Charge

Adi¹,

Teyssèdre

et al. 2017

Technologies

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Abstract:In the field of energy transport, High-Voltage DC (HVDC) technologies are booming at present due to the more flexible power converter solutions along with needs to bring electrical energy from distributed production areas to consumption sites and to strengthen large-scale energy networks. These developments go with challenges in qualifying insulating materials embedded in those systems and in the design of insulations relying on stress distribution. Our purpose in this communication is to illustrate how far the field distribution in DC insulation systems can be anticipated based on conductivity data gathered as a function of temperature and electric field. Transient currents and conductivity estimates as a function of temperature and field were recorded on miniaturized HVDC power cables with construction of 1.5 mm thick crosslinked polyethylene (XLPE) insulation. Outputs of the conductivity model are compared to measured field distributions using space charge measurements techniques. It is shown that some features of the field distribution on model cables put under thermal gradient can be anticipated based on conductivity data. However, space charge build-up can induce substantial electric field strengthening when materials are not well controlled.

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Maxwell–Wagner Effect in Multi-Layered Dielectrics: Interfacial Charge Measurement and Modelling

Cited by 54 publications

References 25 publications

Surface Layer Fluorination-Modulated Space Charge Behaviors in HVDC Cable Accessory

Surface Layer Fluorination-Modulated Space Charge Behaviors in HVDC Cable Accessory

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

DC Model Cable under Polarity Inversion and Thermal Gradient: Build-Up of Design-Related Space Charge

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