Space charge modeling in polymers: review of external applied constraints effects

Beldjilali, A.; Saidi-Amroun, N.; Saïdi, M.

doi:10.1109/tdei.2015.005004

Cited by 11 publications

(8 citation statements)

References 32 publications

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“…The charges in deep traps may escape when carriers gain enough energy, for example, through phonon interaction in thermally assisted hopping, to overcome a potential barrier of localized state and enter an extended state. They may also move via phonon-assisted tunneling through a potential barrier between deep traps [31]. Therefore, the mechanism of charges detrapping from deep traps is complicated, which entails more difficulties to the simulation during depolarization process.…”

Section: Simulation Results Under 10 Kv/mmmentioning

confidence: 99%

Physicochemical Characteristics and Dynamic Charge Mapping in Thermally Aged Two-Layered Polymer Considering Surface States: Experiment and Simulation

et al. 2020

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Under operational conditions of high electric fields and elevated temperatures, the accumulation of space charges at multilayer insulation interfaces is often considered as an important factor affecting insulation performance. This study experimentally explored the influence of different thermal aging degrees (110 °C for 0, 720, 1600, 2100, and 2900 h) on physicochemical characteristics. The space charge dynamics in two-layered thermally aged PET-PET films were measured using the pulsed electro-acoustic (PEA) method and simulated on the basis of a one-dimensional modified bipolar charge transport model. The parameterization for key parameters involved in the model was analyzed through parameter sensitivity. Results indicated that the molecular structure, crystallinity, and dielectric spectra of the PET films are affected by thermal aging. The thermalization process also has noticeable effect on the surface state characteristics, which are characterized by deeper trap depth and larger trap density. Several experimental phenomena measured by the PEA method were observed on the basis of numerical simulation.

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Section: Simulation Results Under 10 Kv/mmmentioning

confidence: 99%

Physicochemical Characteristics and Dynamic Charge Mapping in Thermally Aged Two-Layered Polymer Considering Surface States: Experiment and Simulation

et al. 2020

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“…When the energy of carriers exceeds the barriers ω , they are emitted to vacuum or dielectric. The emission current density is related to temperature, which can be described by the Schottky injection model [14], as shown in Equations () and ():

J_{e} false(t false) = A T^{2} \exp (- \frac{ω_{e}}{k T}) \exp (\frac{e}{k T} \sqrt{\frac{E_{e} (t)}{4 π ε}})

J_{h} false(t false) = A T^{2} \exp (- \frac{ω_{h}}{k T}) \exp (\frac{e}{k T} \sqrt{\frac{E_{h} (t)}{4 π ε}})

where, J e ( t ) and J h ( t ) stand for the current density of electrons and holes on the boundary. A refers to the Richardson constant that approximates to 1.2 × 10 6 A/m 2 ·K 2 .…”

Section: Adaptive Time‐stepping Methods With Improved Transient Upstr...mentioning

confidence: 99%

“…The charge transport is described by a set of equations, which have been widely used in many literatures [11,14]. Among the equations, Poisson equation, shown in Equation (3), is used to demonstrate the distribution of the electric field in dielectrics.…”

Section: Charge Transport Theory Of Bct Modelmentioning

confidence: 99%

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Description of space charge transport in oil‐paper insulation using adaptive time‐stepping transient upstream finite element method

et al. 2021

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The charge transport and accumulation in oil-paper can cause the insulation degradation. So far, the most widely used model to simulate space charge transport and accumulation is the bipolar charge transport (BCT) model, which can well simulate the space charge dynamics. However, there are two shortcomings in the algorithms for solving the BCT model. One is that there is almost no use of vectorisation technology, which may increase the complexity of the algorithm, the other is the usage of fixed step size which might bring extra computation cost. In view of this, an adaptive time-stepping transient upstream finite element method (FEM) is developed to solve the BCT model considering trapping/detrapping, as well as the recombination phenomenon under DC condition in this article. Then, a vectorisation technology is used in the method to optimise the algorithm. Moreover, the adaptive time-stepping method is introduced in simulation to reduce computation time and calculation amount. Simulation results are obtained by programing and later presented, which are basically consistent with the corresponding experimental results. Therefore, the proposed method is expected to promote the optimization design of the oil-paper insulation system.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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“…The motion mechanism and accumulation characteristics of space charges in direct current (dc) electric field have been studied deeply and elaborately [4,5]. However, due to the limitations of time-matched measurement technology, space charge researches are scarcely treated under ac field.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Physical Parameters on Space Charge Characteristics in Cable Insulation Under AC Electric Field

Liu

et al. 2022

IEEE Trans. on Ind. Applicat.

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The space charge dynamic behavior and accumulation are important contributions to electrical tree aging, as recognized for crosslinked polyethylene (XLPE) cable insulation under alternating current (ac) electric stress. In this paper, in order to investigate the reason for the charge accumulation phenomenon revealed by experiments under ac stress, a bipolar space charge transport model with symmetrical or asymmetrical parameters is resolved under ac stress. The charge accumulation mechanism is analyzed based on position and amount of charge function of voltage application time and voltage phase. The effects of each major physical parameter are simulated and analyzed separately. It is found that there is no obvious accumulation of space charges with symmetrical parameters. Asymmetrical parameters result in a difference of motion process between positive and negative charges, which greatly enhances charge accumulation. Each main parameter has an influence on charge accumulation from different angles and levels. The applicability of the simulation model with asymmetrical parameters is assessed by comparing experiments and simulation results on space charge. This study contributes to the understanding of space charge generation mechanism under ac conditions and helps improving the stability and operation properties of XLPE cables in power system.

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Space charge modeling in polymers: review of external applied constraints effects

Cited by 11 publications

References 32 publications

Physicochemical Characteristics and Dynamic Charge Mapping in Thermally Aged Two-Layered Polymer Considering Surface States: Experiment and Simulation

Physicochemical Characteristics and Dynamic Charge Mapping in Thermally Aged Two-Layered Polymer Considering Surface States: Experiment and Simulation

Description of space charge transport in oil‐paper insulation using adaptive time‐stepping transient upstream finite element method

The Influence of Physical Parameters on Space Charge Characteristics in Cable Insulation Under AC Electric Field

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