Effect of temperature on trap depth formation in multi-layer insulation: Low density polyethylene and fluorinated ethylene propylene

Rogti, F.; Ferhat, M.

doi:10.1063/1.4862061

Cited by 31 publications

(15 citation statements)

References 15 publications

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“…10 In fact, space charge behavior in insulating polymers such as low density polyethylene (LDPE) is not yet well understood. [11][12][13] The space charge in insulating polymers depends on many factors, such as the conductivity, permittivity, electrode material, morphology of the insulation, roughness interface, applied electric field, and temperature. 13 During the past few years, several experimental and theoretical models with numerical simulation have been integrated for a better understanding of space charge dynamic and characteristics in polymer insulator under electrical stress.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Space Charge Dynamic in Polyethylene Under DC Continuous Electrical Stress

Boukhari¹,

Fatiha²

2016

Journal of Elec Materi

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The space charge dynamic plays a very important role in the aging and breakdown of polymeric insulation materials under high voltage. This is due to the intensification of the local electric field and the attendant chemicalmechanical effects in the vicinity around the trapped charge. In this paper, we have investigated the space charge dynamic in low-density polyethylene under high direct-current voltage, which is evaluated by experimental conditions. The evaluation is on the basis of simulation using a bipolar charge transport model consisting of charge injection, transports, trapping, detrapping, and recombination phenomena. The theoretical formulation of the physical problem is based on the Poisson, the continuity, and the transport equations. Numerical results provide temporal and local distributions of the electric field, the space charge density for the different kinds of charges (net charge density, mobile and trapped of electron density, mobile hole density), conduction and displacement current densities, and the external current. The result shows the appearance of the negative packet-like space charge with a large amount of the bulk under the dc electric field of 100 kV/mm, and the induced distortion of the electric field is largely near to the anode, about 39% higher than the initial electric field applied.

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Section: Introductionmentioning

confidence: 99%

Simulation of Space Charge Dynamic in Polyethylene Under DC Continuous Electrical Stress

Boukhari¹,

Fatiha²

2016

Journal of Elec Materi

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“…1,2 However, most work in this field has been conducted at room temperature, while space-charge dynamics in insulation under DC electric stress at high temperature has received only limited attention. [3][4][5][6][7][8][9][10][11][12][13][14][15][16] My latest research 6 indicates that high temperatures have a significant effect on the formation and filling of shallow traps at dielectric interfaces.…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature on Formation and Stability of Shallow Trap at a Dielectric Interface of the Multilayer

Rogti

2015

Journal of Elec Materi

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Space-charge behavior at dielectric interfaces in multilayer low-density polyethylene (LDPE) and fluorinated ethylene propylene (FEP) subjected to a direct-current (DC) field has been investigated as a function of temperature using the pulsed electroacoustic technique. A sandwich structure constituted by two nonidentical LDPE/FEP dielectric films was used to study the charging propensity of electrode/dielectric and dielectric/dielectric interfaces. The time dependence of the space-charge distribution was subsequently recorded at four temperatures, 20°C, 25°C, 40°C, and 60°C, under field (polarization) and short-circuit (depolarization) conditions. The experimental results demonstrate that temperature plays a significant role in the space-charge dynamics at the dielectric interface. It affects the charge injection, increases the charge mobility and electrical conductivity, and increases the density of shallow traps and trap filling. It is found that traps formed during polarization at high temperature do not remain stable after complete discharge of the multidielectric structure and when poled at low temperatures.

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“…Dielectric nanocomposites have been widely used in the high voltage direct current (HVDC) cables [1][2][3] . As we know, a large amount of space charges will accumulate when a dielectric is energized, resulted from the traps existing in the dielectric materials 4 .…”

Section: Introductionmentioning

confidence: 99%

Influence of hierarchy structure on electrical properties of gradient-distribution aluminum oxide/polyethylene nanocomposites

Wang

Zha

et al. 2016

Composites Science and Technology

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In the recent decades, the phenomena of space charge accumulation in the high voltage direct current (HVDC) insulation have attracted more and more attention. In this paper, the gradient-distribution multi-layered Al 2 O 3 /low density polyethylene (LDPE) nanocomposites were prepared via layer-by-layer melting blending and hot pressing method. Morphologies and electrical properties of these gradient-distribution structured composites were discussed. Results showed that this unique structure could largely enhance the breakdown strength of LDPE. The breakdown strength of the LDPE nanocomposites varied with nano-Al 2 O 3 concentrations, and it could reach to 200 kV/mm for the LDPE nanocomposites.Besides, space charge of the LDPE nanocomposites was measured by pulsed electro-acoustic (PEA) method. The charge profiles indicated that space charge suppression of the gradient-distribution multi-layered composites was better than that of the monolayer ones with general mean-distribution structure. Their excellent insulating properties were attributed to the trap which exists in the surface, and that could well inhibit the charge injecting into the materials.

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Effect of temperature on trap depth formation in multi-layer insulation: Low density polyethylene and fluorinated ethylene propylene

Cited by 31 publications

References 15 publications

Simulation of Space Charge Dynamic in Polyethylene Under DC Continuous Electrical Stress

Simulation of Space Charge Dynamic in Polyethylene Under DC Continuous Electrical Stress

Effect of Temperature on Formation and Stability of Shallow Trap at a Dielectric Interface of the Multilayer

Influence of hierarchy structure on electrical properties of gradient-distribution aluminum oxide/polyethylene nanocomposites

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