Simulation of Influence of DC Pre-Stress on Space-Charge Characteristics of Cross-Linked Polyethylene in Inhomogeneous Field

Liu, Hechen; Xu, Xiaobin; Liu, Yunpeng; Meng, Shaoxin; Guo, Zhanpeng; Zhang, Mingjia

doi:10.1109/access.2020.3006916

Cited by 7 publications

(6 citation statements)

References 20 publications

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“…The inception and growth of electrical trees are closely related to charge carrier traps in polymers. Few studies combined thermal‐electron theory and photodegradation theory as charge carrier trap theory to explain the behavior of electrical trees 19,28 . According to thermal‐electron theory, the trap energy level in the polymer is deep.…”

Section: Discussionmentioning

confidence: 99%

“…Few studies combined thermal-electron theory and photodegradation theory as charge carrier trap theory to explain the behavior of electrical trees. 19,28 According to thermal-electron theory, the trap energy level in the polymer is deep. The injected electron sinks into a low energy state after several times of scattering, while the dissipated energy is transferred to another electron through an auger effect, and it transforms into a thermal electron.…”

Section: Influence Of the Temperature On Electrical Treeing And Parti...mentioning

confidence: 99%

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Inhibition of electrical trees degradation of crosslinked polyethylene at high temperatures by electron‐buffering voltage stabilizers

Hong

Chen

Zhu

et al. 2022

J of Applied Polymer Sci

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The effect of adding electron-buffering voltage stabilizer (1 wt% maminobenzoic acid) on the electrical tree-induced degradation of cross-linked polyethylene (XLPE) was studied at high temperatures. The electrical tree inception, growth, and partial discharge characteristics were simultaneously analyzed at 30, 50, and 70 C, respectively. The results showed that the growth rate of electrical tree and partial discharge activity as well as the discharge repetition rate, significantly increased with the temperature for pure XLPE and XLPE stabilizer blend. However, the XLPE stabilizer blend exhibited higher tree inception voltage, lower tree growth rate, and partial discharge activity than pure XLPE. The addition of the voltage stabilizer reduced the carbon layer thickness in the tree channel and offered higher resistance to the electrical tree growth. Surface potential decay demonstrated that the voltage stabilizer addition decreased the trap energy level, but increased the shallow trap density of the XLPE. Quantum chemical calculations showed that the voltage stabilizer enhanced the ability to buffer the high-energy electrons in the XLPE. A high-energy electron buffering mechanism was also proposed to explain the effect of voltage stabilizer on the electrical treeing and partial discharge activity in the XLPE at high temperatures.

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Section: Discussionmentioning

confidence: 99%

Section: Influence Of the Temperature On Electrical Treeing And Parti...mentioning

confidence: 99%

Inhibition of electrical trees degradation of crosslinked polyethylene at high temperatures by electron‐buffering voltage stabilizers

Hong

Chen

Zhu

et al. 2022

J of Applied Polymer Sci

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“…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: Et Al Focus On the Spacementioning

confidence: 99%

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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“…Furthermore, numerical simulation can assist the experiment to investigate the transport characteristics of space charge from a microscopic level (Zhang et al, 2022). The bipolar charge transport (BCT) model is widely used in the simulation of the dynamic charge characteristics of the polymer, considering the injection, extraction, recombination, trapping, detrapping, and transport of space charge (Tian and Hou, 2018;Liu et al, 2020). However, the effect of macroscopic conductivity on microscopic charge transport is not considered in the BCT model.…”

Section: Introductionmentioning

confidence: 99%

Modified Charge Transport Model Under High-Frequency Unipolar Square Wave Voltage

Xie

Yan²,

Shi³

et al. 2022

Front. Mater.

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As the main insulation material of the power electronic transformer (PET), polyimide (PI) is easy to accumulate space charge under the continuous high-frequency pulse voltage, which will threaten the operation of PET and cause electric field distortion. At present, the microscopic mechanism of charge transport under high-frequency voltage is unclear. Numerical simulation is an effective method to explore the transport characteristics of space charge. The simulation of charge transport under DC voltage is mainly based on the bipolar charge transport (BCT) model. However, the charge transport behaviors under high-frequency pulse voltage cannot be simulated by the traditional models accurately. Given this, based on the BCT model, the High-Frequency Voltage Charge Transport (HFCT) model is proposed, considering nonlinear charge mobility of the polymer and the effect of the frequency. Finally, the space charge and electric field distribution under square pulse wave voltages with different rising times are simulated based on the HVCT model, concluding that the reduction of rising time will promote the accumulation of space charge. In view of this, the HVCT model is expected to optimize the insulation design of PET and provide a reference for the dynamic simulation of space charge.

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Simulation of Influence of DC Pre-Stress on Space-Charge Characteristics of Cross-Linked Polyethylene in Inhomogeneous Field

Cited by 7 publications

References 20 publications

Inhibition of electrical trees degradation of crosslinked polyethylene at high temperatures by electron‐buffering voltage stabilizers

Inhibition of electrical trees degradation of crosslinked polyethylene at high temperatures by electron‐buffering voltage stabilizers

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

Modified Charge Transport Model Under High-Frequency Unipolar Square Wave Voltage

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