Improved space charge transport model in bi‐layer dielectrics—considering carrier dynamic equilibrium

Li, Xiayu; Du, B. X.; Yao, Hang; Wang, Zehua

doi:10.1049/hve.2019.0193

Cited by 23 publications

(18 citation statements)

References 23 publications

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“…Our previous research work has shown that below 60°C, the interfacial charge density of the epoxy resin impregnated crepe paper calculated according to the MW model is consistent with the measured value, while above 60°C, it is smaller than the measured value [13]. In order to overcome the shortages of the MW model and bipolar charge transport model, Liang Hucheng, Du Boxue and et al proposed an improved space charge transport model in bi‐layer dielectrics [14].…”

Section: Introductionmentioning

confidence: 98%

Space charge dynamics in epoxy resin under voltage polarity reversal at various temperatures

Liu

Zhang

et al. 2020

High Voltage

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Epoxy resin has been used to cast the core of the dry‐type high voltage direct current bushings and can accumulate space charge under high electric fields at high temperatures, which is believed to be a potential threat to the safe operation of dry bushings, especially under polarity reversal. In this study, results of a study of the evolution of space charge and electric field distribution in epoxy resin, under polarity reversal at 10 and 20 kV/mm, and at temperatures between 40 and 100°C, are presented. The results show that the space charge dynamics in epoxy resin during the test were different at various temperatures. At temperatures no more than 60°C, space charge accumulation within the samples was not obvious. Instead, a low‐frequency dielectric relaxation process maybe occurs during the polarity reversal, which made the charge peaks on the electrodes after the reversal were slightly smaller than those before the reversal. At temperatures no less than 80°C, considering that the applied electric field has little effect on the barrier reductions of the traps within the samples, the space charge dynamics were mainly governed by a thermally activated process, and the depths of the deepest occupied traps were obtain by analysing the transient processes.

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Section: Introductionmentioning

confidence: 98%

Space charge dynamics in epoxy resin under voltage polarity reversal at various temperatures

Liu

Zhang

et al. 2020

High Voltage

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“…But, it is noted that the non-linear coefficient α of J 3 is about 1.54 according to the experiment results, which is relatively smaller than the theoretical value (α ¼ 2) in Equation (13). The decrease in α may be caused by the decrease of mobility under extra high electric field, which would be further discussed in the following section.…”

Section: Conduction Mechanism In Xlpe From Low To High Electric Fieldmentioning

confidence: 77%

Mobility‐limited charge injection in cross‐linked polyethylene under extra high electric field

et al. 2020

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In this study, characteristics of charge injection under extra high electric field (above 100 kV/mm) in cross-linked polyethylene (XLPE) were investigated by experiments of conduction current and space charge. The results show that current density from low electric field to sample breakdown corresponds to space charge limited current (SCLC) theory. More specifically, Schottky current is similar to experiment current before 100 kV/mm, while the J-E curve conforms to a modified SCLC theory after 100 kV/mm. Besides, the non-linear coefficient of J-E curve from 100 kV/mm to extra high electric field is smaller than theoretical value, and the injection depth of space charge is restricted as the field becomes higher than 100 kV/mm, which may be caused by the negative differential mobility of charge. Driven by extra high electric field, charge collides with lattice of dielectric and scatters. As a result, mean free time of charge decreases and charge mobility is reduced with the increased field. Consequently, considering the decrease in charge mobility, a mobility-limited charge injection equation is proposed, and the validity of the proposed equation under extra high electric field is demonstrated by space charge simulation. 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 details of M +θ∆t•K and M-(1-θ)∆t•K can be presented in Equations ( 23) and (24). Where θ = 0, 0.5, 1 is a constant corresponds to forward Euler method, Crank-Nicolson (C-N) method and backward Euler method.…”

Section: Improved Transient Upstream Fem For Solving the Bct Modelmentioning

confidence: 99%

“…The mobility of holes and electrons is assumed as a constant according to [8,11,15]. Classical parameters used for describing the charge activities are selected based on existing researches [19][20][21][22][23][24]. Some parameters (Schottky injection barrier height ω e and ω h , max trapped charge density ρ et0 and ρ ht0 ) in [18] are directly used.…”

Section: Space Charge Distributions Under 2-dimension Plane Modelmentioning

confidence: 99%

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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Improved space charge transport model in bi‐layer dielectrics—considering carrier dynamic equilibrium

Cited by 23 publications

References 23 publications

Space charge dynamics in epoxy resin under voltage polarity reversal at various temperatures

Space charge dynamics in epoxy resin under voltage polarity reversal at various temperatures

Mobility‐limited charge injection in cross‐linked polyethylene under extra high electric field

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

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