Effect of thermal ageing on space charge in ethylene propylene rubber at DC voltage

Men, Rujia; Lei, Zhipeng; Song, Jiancheng; Li, Yuanyuan; Lin, Lingyan; Tian, Mingliang; Fabiani, Davide; Xu, Xiaoxiao

doi:10.1109/tdei.2018.007752

Cited by 9 publications

(6 citation statements)

References 20 publications

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“…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 . ω e and ω h refer to injection barriers (effective work function) of the two carriers.…”

Section: Charge Injection Theory Of Bct Modelmentioning

confidence: 99%

“…The accumulation and transport of space charges can cause the degradation or even breakdown of the oil-paper insulation. Many of methods for measuring space charge in dielectric materials have been proposed so far, such as the pulsed electroacoustic (PEA), pressure wave propagation (PWP) [1,2], etc. Meanwhile, the numeric calculation technique, as an important auxiliary technique of the experiment method, has been used for improving the optimal design of electrical insulation in computational high-voltage engineering.…”

Section: Introductionmentioning

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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Section: Charge Injection Theory Of Bct Modelmentioning

confidence: 99%

Section: Introductionmentioning

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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“…During polarization phase, the impurity ions move along the direction of the electric field and cause the increase of polarization current. In addition, the previous studies have shown that small physical defects will gradually form in EPR such as the air gap in the order of micrometer [19]. Moreover, the thermal aging accelerates the fracture of EPR molecular chain, resulting in the increase of defects, as well as the trap energy level and trap density.…”

Section: A Polarization and Depolarization Currentmentioning

confidence: 99%

Aging Life Evaluation of Coal Mining Flexible EPR Cables Under Multi-Stresses

et al. 2020

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As important power cables for the mining mobile equipment, such as mining shearers, ethylene propylene rubber (EPR) cables often suffer from the combining effect of various stresses on site. In order to evaluate the aging state of EPR insulation, the paper carried out the multi-stress accelerated aging test on the insulation of coal mining flexible EPR cables. The infrared spectrum, elongation at break and polarization and depolarization current of cable insulation samples were measured. The insulation state of EPR cable was evaluated by using the aging factor obtained from isothermal relaxation current. Based on the failure standard of 50% elongation at break, the life formula of EPR insulation was deduced. The experimental and analytical results show that the tiny air gap was torn to the larger air gap under the mechanical stress, which leads to the increase of oxygen infiltration and promotes the thermo-oxygen reaction. The fracture energy of EPR decreases, and mechanical aging is accelerated. Aging factor and elongation at break can indicates the deterioration degree of EPR insulation. Based on the least square method and Arrhenius equation, the service life of the insulation of coal mining flexible EPR cables is deduced. INDEX TERMS Ethylene propylene rubber, cables, thermal aging, mechanical aging, life evaluation.

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“…Men et al aged EPR material at a temperature of 120 • C for 120 days and measured the space charge profile. This indicated that negative charge accumulated near both electrodes and that the amount first rose and then fell over time [9]. Yin et al found that when LDPE and EPR were in close contact, their interface could easily accumulate space charge.…”

Section: Introductionmentioning

confidence: 99%

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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Effect of thermal ageing on space charge in ethylene propylene rubber at DC voltage

Cited by 9 publications

References 20 publications

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

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

Aging Life Evaluation of Coal Mining Flexible EPR Cables Under Multi-Stresses

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

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