Simulation of Interface Charge Behaviors in HVDC Cable Accessory Based on Bipolar Carrier Transportation Model

Li, Jin; Qi, X. Y.; Du, B. X.; Liang, H. C.; Xiao, Mei; Sun, H. L.; Li, Z. L.; HAN, Tsunghsien; Xiao, M.; Li, Y. X.

doi:10.1109/icd.2018.8468442

Cited by 3 publications

(5 citation statements)

References 4 publications

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“…The geometrical parameters and the material parameters required for thermal conduction calculation are shown in Table 2. The simulation parameters are selected based on the parameter range estimated by previous researchers and the guidance of relevant simulation literatures [17], [18], [21], [24]- [28].…”

Section: Resultsmentioning

confidence: 99%

“…When the voltage increases to a certain threshold, the charge formation is mainly caused by the charge injection and migration characteristics [15], [16]. In the view of this, a bipolar charge transport model is introduced to investigate the interface charge behavior of composite insulation [17], [18]. Four kinds of charges, namely free electrons, trapped electrons, free holes and trapped holes are considered in the model.…”

Section: Introductionmentioning

confidence: 99%

“…Four kinds of charges, namely free electrons, trapped electrons, free holes and trapped holes are considered in the model. J. Li et al investigated the space charge and electric field distribution characteristics of cable accessories considering the interface effect, and the results show that the charge distribution could be improved by reducing the interface barrier and matching the charge mobility of the two materials [17]. L. Lan.…”

Section: Introductionmentioning

confidence: 99%

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Effect of XLPE/EPDM Interface on Space Charge Behavior in Cable Accessory

et al. 2019

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Space charges accumulate easily at insulation interface of cable accessories, which cause different electric field distribution and aging characteristics compared to single-layered cable. To explore the space charge behavior in double-layered insulation of cable accessories, a one-dimensional (1D) axisymmetric model for bipolar charge transport is built in this work, in which the effects of temperature gradient and electric field gradient in the radial direction are considered. Then the influences of electric field/temperature gradient and interface position on transport behavior of space charges are investigated. The simulation results suggest that the charges accumulate easily at the interface, which severely reduce the electric field in the inner layer of insulation and further inhibit the injection and migration processes of charges. The charge density at the interface increases with temperature and voltage, which accelerates the decay of the charge injection, furthers the interface charges to reach the dynamic equilibrium state quickly. The charge density at the interface and the electric field distribution are closely related to the interface position, and the electric field is more uniform when XLPE occupies the 1/3 to 1/2 inner part of the whole insulation.INDEX TERMS Double-layered insulation, bipolar charge transport model, electric field gradient, temperature gradient, interface position.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of XLPE/EPDM Interface on Space Charge Behavior in Cable Accessory

et al. 2019

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Section: Introductionmentioning

confidence: 99%

“…Meanwhile, the numerical simulation can assist in interpreting experimental results and analyzing the space charge characteristics. In space charge simulation, the bipolar charge transport (BCT) model is used to describe the motion characteristics of the space charge in the polymer [8][9][10][11]. Du et al propose a carrier dynamic balance model based on the BCT model, which combines the conductivity and the carrier movement process, but the effect on heterocharge is not considered in this model [12].…”

Section: Introductionmentioning

confidence: 99%

Effect of multi‐factors on heterocharges for oil‐impregnated paper in converter transformer using modified charge transport model

Yan

Liu

Fan

et al. 2021

IET Generation Trans & Dist

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The heterocharge accumulated in the oil-paper insulation system of the converter transformer will enhance the local electric field and cause insulation deterioration. Numerical simulation is an effective method to analyze heterocharge. Currently, the numerical simulation of heterocharge is mainly based on the bipolar charge transport (BCT) model and the impurity ion transport (IIT) model. However, the effects of temperature, conductivity, and thickness of oil-impregnated paper on charge transport have not been considered in these models. In view of this, a modified charge transport (MCT) model by introducing the Maxwell-Wagner model and heat conduction equation is proposed in this paper based on the BCT model and IIT model. Then, the influence of multi-factors (temperature gradient, moisture content, and oil-impregnated paper thickness) on heterocharge accumulation is investigated by using the MCT model. The simulation results obtained by the MCT model are more consistent with the experimental results than the BCT model, which proves the accuracy and superiority of the MCT model. Moreover, the increase in temperature gradient, moisture content, and oil-impregnated paper thickness will enlarge the ion dissociation rate, conductivity, and trap density, and thus promote the generation of heterocharge. In that respect, the MCT model is expected to optimize the insulation design and provide a reference for space charge dynamic simulation.

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Space Charge Behavior in Ethylene Propylene Rubber Under a 50-Hz AC Electric Field

et al. 2019

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In this study, the space charge behavior in ethylene propylene rubber (EPR) under a 50-Hz AC field is studied based on the variation of space charge response, FTIR spectra and impurity contents inside EPR with thermal treatment. The space charge was detected with the pulsed electroacoustic (PEA) method and the phase shift of detecting pulse under 50 Hz AC field was realized according to the automatic equal phase shift (AEPS) principle. The results show three main types of impurities in untreated EPR. Three distinct regions of space charge distribution are seen in untreated EPR under a 50-Hz AC field. The mean phase density of space charge ρ θ is increased with the enhancement of the applied field from 15 to 61 kV/mm. The maximum electric field distortion rate of untreated EPR tends to rise first and then decrease, ranging from 6.65% to 31.87%. The impurity content and the ρ θ decreased significantly for EPR thermal treated at 150 • C for 18 h. Corresponding, the maximum electric field distortion rate is effectively reduced to 0.66%. Finally, the space charge source and migration process are speculated based on the diffusion trend of the space charge isodensity line and the migration direction of various charges under the electric field.INDEX TERMS Ethylene propylene rubber (EPR), AC electric field, space charge, direct detection, electric field distortion, impurity.

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Simulation of Interface Charge Behaviors in HVDC Cable Accessory Based on Bipolar Carrier Transportation Model

Cited by 3 publications

References 4 publications

Effect of XLPE/EPDM Interface on Space Charge Behavior in Cable Accessory

Effect of XLPE/EPDM Interface on Space Charge Behavior in Cable Accessory

Effect of multi‐factors on heterocharges for oil‐impregnated paper in converter transformer using modified charge transport model

Space Charge Behavior in Ethylene Propylene Rubber Under a 50-Hz AC Electric Field

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