Charge transport dynamics and the effects on electrical tree degradation under DC voltages in thermally aged silicone rubber

Zhang, Yunxiao; Zhou, Yi; Wu, Chao; Zhang, Ling; Chen, Teng; Nie, Hao

doi:10.1088/1361-6463/ab876b

Cited by 24 publications

(10 citation statements)

References 49 publications

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“…1.6×10 13 2.0×10 13 2.4×10 13 Trapping 1.58×10 13 2.37×10 13 9.0×10 9 1.2×10 10 1.5×10 10 Energy released by space charges (eV/m³) Detrapping 1.24×10 10 1.63×10 10 Notably, the DC and AC peak electric field strengths were the same. Compared with the DC electric field, the energy released by the space charge of trapping, detrapping, and recombination in the AC electric field was approximately twice as much as that in the DC electric field, while the RMS AC field was 30% less than that of the DC field.…”

Section: Energetic Aspects Of the Dynamic Behavior On Insulationmentioning

confidence: 96%

“…Polymer molecular bonds can be broken and reconstructed through energetic processes induced by the charges, representing a possible triggering step to electrical treeing. 10 Several studies have shown that the dynamic behavior of space charges is often accompanied by the release of energy. 2,11,12 Such energy exchanges, which can alter the chemical properties of polymer molecules and degrade the material, can occur near the interfaces during the injection and extraction of charges.…”

Section: Introductionmentioning

confidence: 99%

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Study on the influencing factors of space charge dynamic behavior in XLPE insulation under alternating current electric field

Xu¹,

He²,

Liu³

et al. 2022

J. Phys. D: Appl. Phys.

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The dynamic behavior of space charges is one of the potential factors that cause electrical aging. In this paper, a bipolar space charge transport model was established under an AC electric field in cross-linked polyethylene. The effects of physical parameters on the dynamic behavior of space charges in an AC electric field were explored by changing the injection barrier heights, mobilities, trapping coefficients, and detrapping barrier heights of positive and negative charges. The effects of voltage conditions on space charge behavior were explored by changing the amplitude and frequency. The effects of temperature were studied by setting a temperature gradient similar to that of real cable operation. The asymmetry of the physical parameters could seriously aggravate the accumulation of space charges in the AC field. A set of physical parameters based on these results was identified. Both the increase in voltage amplitude and decrease in frequency enhanced the amount of and penetration into the insulation of the accumulated space charge. The dynamic behaviors of the space charges were more active with increased voltage amplitude and frequency. The temperature gradient in the cable insulation implies that the degree of accumulation, penetration into material, and activity of dynamic behaviors of the space charges at the warmest electrode are greater than those at the coldest. Compared with the DC field, the dynamic behavior of space charges in the AC electric field is more active and releases more energy. This research provides a theoretical basis for inhibiting the accumulation of space charges in an AC electric field.

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Section: Energetic Aspects Of the Dynamic Behavior On Insulationmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Study on the influencing factors of space charge dynamic behavior in XLPE insulation under alternating current electric field

Xu¹,

He²,

Liu³

et al. 2022

J. Phys. D: Appl. Phys.

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show abstract

“…Gardette et al 21 revealed that elevated temperatures result in the disintegration of molecular chain of polyethylene, which leads to the formation of free radicals. Zhang et al 22 suggested that the electrical properties of aged SiR, such as electrical tree initiation voltage, show a trend of first increasing and then decreasing. Ito et al 23 found that the mechanical properties of aged SiR decrease, while the hardness and dielectric properties increase.…”

Section: Introductionmentioning

confidence: 99%

Mechanistic insights into the thermal–mechanical aging of the interface of cross‐linked polyethylene/silicone rubber

Zhang,

Zheng

et al. 2023

J of Applied Polymer Sci

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Cable accessory has the interface formed by cross‐linked polyethylene (XLPE)/silicone rubber (SiR), which is prone to surface discharge and thus causes the failure of cable system. This article conducts the simulated experiment of thermal–mechanical aging on the interface of XLPE/SiR. The interfacial breakdown and dielectric properties under different aging states are analyzed. It is found the interfacial aging process of XLPE can be divided into the recrystallization stage and the oxidation reaction stage. The former contributes to the interfacial roughness and thus the better insulating performance, whereas the latter leads to degradation of interface, and thus the worse insulating performance. In addition, combined with the established electric field model for the interface, the differences between thermal–mechanical aging and individual thermal aging on the interface are discussed. The sample under thermal–mechanical aging reaches the maximum interfacial breakdown voltage later than that under individual thermal aging, but their performance tends to be consistent in the later stage of aging.

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“…transportation, aerospace, electronics, and electrical systems. [1][2][3][4] However, as the development of application fields, performance requirements of different materials have increased. Further enhancing the thermal stability of silicone rubber has become an important topic.…”

Section: Introductionmentioning

confidence: 99%

Synergistic effect and mechanism of polysilazane and platinum on the thermal stability of silicone rubber

Chen

Zhang

Liang

et al. 2021

Journal of Elastomers & Plastics

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Polysilazane and platinum were adopted to enhance the thermal stability of silicone rubber. The effect and mechanism of polysilazane and platinum on enhancing thermal stability were investigated via thermogravimetry, scanning electron microscopy-energy dispersive X-ray spectrometry, thermogravimetry-Fourier transform infrared spectrometry, and Fourier transform infrared spectrometry. Remarkable synergism between polysilazane and platinum was found in enhancing thermal stability of silicone rubber. When 1.34 wt% polysilazane and 8 ppm platinum were added, the degradation temperatures were elevated. Furthermore, the thermal residues of silicone rubbers were increased from 30–45 to 66–76 wt%, and maximum degradation rates were reduced from 8.81–15.8 to 4.55–5.02 wt%/min. Besides, silicone rubber demonstrated excellent shape retention at high temperature in the presence of polysilazane and platinum. The mechanism may be that platinum cooperated with polysilazane and efficiently catalyzed radical crosslinking between polysilazane and silicone chains. As a result, a tightly crosslinked network was developed, and degradation of silicone rubber was suppressed.

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Charge transport dynamics and the effects on electrical tree degradation under DC voltages in thermally aged silicone rubber

Cited by 24 publications

References 49 publications

Study on the influencing factors of space charge dynamic behavior in XLPE insulation under alternating current electric field

Study on the influencing factors of space charge dynamic behavior in XLPE insulation under alternating current electric field

Mechanistic insights into the thermal–mechanical aging of the interface of cross‐linked polyethylene/silicone rubber

Synergistic effect and mechanism of polysilazane and platinum on the thermal stability of silicone rubber

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