Effects of electrical-hydrothermal aging degradation on dielectric and trap properties of high temperature vulcanized silicone rubber materials

Xu, Hao; Xie, Congzhen; Wang, Rui; Gou, Bin; Luo, Shoukang; Zhou, Jiangang

doi:10.1039/d0ra00134a

Cited by 9 publications

(3 citation statements)

References 27 publications

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“…The synergistic effect of UV light, salt, fog, humidity, acid rain and heat on the performance of silicone rubber and its composites was reported by Khattak et al [21]. The hydrophobicity recovery phenomenon of both RTV and HTV silicone rubber under different stresses was investigated in various studies, implying that the transfer of Low Molecular Weight (LMW) components from material bulk to the surface is the main reason for the recovery of hydrophobicity of silicone rubber [22][23][24][25]. Ahmadi-veshki et al concluded that pollution and humidity increased the probability of occurrence of flashover [26].…”

Section: Introductionmentioning

confidence: 93%

Investigation of Hydrothermally Stressed Silicone Rubber/Silica Micro and Nanocomposite for the Coating High Voltage Insulation Applications

et al. 2021

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Silicone rubber is a promising insulating material that has been performing well for different insulating and dielectric applications. However, in outdoor applications, environmental stresses cause structural and surface degradations that diminish its insulating properties. This effect of degradation can be reduced with the addition of a suitable filler to the polymer chains. For the investigation of structural changes and hydrophobicity four different systems were fabricated, including neat silicone rubber, a micro composite (with 15% micro-silica filler), and nanocomposites (with 2.5% and 5% nanosilica filler) by subjecting them to various hydrothermal conditions. In general, remarkable results were obtained by the addition of fillers. However, nanocomposites showed the best resistance against the applied stresses. In comparison to neat silicone rubber, the stability of the structure and hydrophobic behavior was better for micro-silica, which was further enhanced in the case of nanocomposites. The inclusion of 5% nanosilica showed the best results before and after applying aging conditions.

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Section: Introductionmentioning

confidence: 93%

Investigation of Hydrothermally Stressed Silicone Rubber/Silica Micro and Nanocomposite for the Coating High Voltage Insulation Applications

et al. 2021

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“…(3) As for the high temperature vulcanization of SR, it also needs to be heated to 150 • C and kept for 2 h in processing [50].…”

Section: Light-curing Instead Of Heat-curing 221 Photocurable Process...mentioning

confidence: 99%

Full-life-cycle eco-friendly polymeric insulating materials: research progress and future prospects

Zhang

Zhao

et al. 2023

J. Phys. D: Appl. Phys.

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Polymeric insulating materials is the basis of electric power system and has been widely employed in various electric power system apparatus. With the emergence of net-zero carbon emission policies by 2050-2060, the eco-friendly polymeric insulation is urgent and promising in the R&D of advanced dielectric materials. This paper reviews the current progress of eco-friendly upgrade in each lifecycle stages of polymeric insulating materials, i.e. raw material, fabricating, operating, and retiring. A series of interesting and fundamental results have been summarized. Drawbacks of the current researches are discussed, and outlooks are provided for the future development of eco-friendly polymeric insulating materials. This paper is hoped to inspire some novel ideas for the development of advanced insulating materials suitable for the promotion of net-zero carbon emission technologies.

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“…To the best of our knowledge, only a few researchers have taken on the challenge of building innovative multi-factor aging platforms for HTV-SR. Bi et al [15] analyzed the corona aging characteristics of SR under different humidity, salt fog, and haze conditions, demonstrating the facilitating role that humidity plays in the deterioration of SR. Hu et al [16] studied the aging mechanism of SR under both thermal and mechanical stresses, confirming the competitive and synergistic effects between the two stresses. Xu et al [17] established an aging platform combining an electric field and hydrothermal conditions for HTV-SR and discussed the failure law based on the trap theory. According to the studies above, high voltage, heat, and moisture are the most common factors for HTV-SR aging, whereby the setting of temperature is usually constant [18,19].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Accelerated Deterioration of High-Temperature Vulcanized Silicone Rubber under Multi-Factor Aging Tests Considering Temperature Cycling

Zeng

Peng

et al. 2023

Polymers

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High-temperature vulcanized silicone rubber (HTV-SR) employed for composite insulators is continuously subjected to a complex environment of alternating heat, corona discharge, humidity, etc. These stresses (especially alternating heat) complicate the aging mechanism of HTV-SR, which lacks systematic investigation. In this paper, a multi-factor aging platform considering temperature cycling, moisture, and corona discharge is established. Specifically, four temperature-cycling settings are employed, each of which lasts for 15 cycles. The surface morphology, hydrophobicity, and chemical, mechanical, and electrical properties of aged samples are methodically characterized. Experimental results show that the aging degree is correlated to the range of temperature cycling, which is attributed to diverse crosslink-degradation degrees with different temperature differences. Under a large temperature difference (70 °C), HTV-SR possesses a high crosslinking degree and a low degradation degree, making the material hard but easy to crack with alternating thermal stress. Then, severe defects and water condensation emerge on the HTV-SR surface, which promote the diffusion of corona products and water molecules into the material. The subsequent rise in crosslinking density caused by in-depth oxidation further exacerbates the aging of the material. Consequently, it brings about poor hydrophobicity, high interfacial polarization, and shallow trap energy levels in HTV-SR. This work provides a detailed analysis of the aging mechanism of HTV-SR in a simulated on-site environment.

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Effects of electrical-hydrothermal aging degradation on dielectric and trap properties of high temperature vulcanized silicone rubber materials

Abstract: In this paper, a new aging platform combined the high voltage electric field and the hydrothermal environment was built.

Cited by 9 publications

References 27 publications

Investigation of Hydrothermally Stressed Silicone Rubber/Silica Micro and Nanocomposite for the Coating High Voltage Insulation Applications

Investigation of Hydrothermally Stressed Silicone Rubber/Silica Micro and Nanocomposite for the Coating High Voltage Insulation Applications

Full-life-cycle eco-friendly polymeric insulating materials: research progress and future prospects

Mechanism of Accelerated Deterioration of High-Temperature Vulcanized Silicone Rubber under Multi-Factor Aging Tests Considering Temperature Cycling

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