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Open AccessArticle

Electrical Strength and Physicochemical Performances of HTV Silicone Rubber under Salt-Fog Environment with DC Energized

1
State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China
2
State Grid Chongqing Electric Power Company, Gaoxin District, Chongqing 400039, China
*
Author to whom correspondence should be addressed.
Polymers 2020, 12(2), 324; https://doi.org/10.3390/polym12020324
Received: 13 December 2019 / Revised: 23 January 2020 / Accepted: 25 January 2020 / Published: 4 February 2020
(This article belongs to the Special Issue Advances in Rubber Composites)
In recent years, the performances of rubber composite insulators, which operate in the coastal foggy regions, have attracted researchers’ concern because of the observation of their degradation. In this paper, salt-fog experiments with DC test voltage of high-temperature vulcanized (HTV) silicone rubber (SR) have been conducted. The electrical strength and material performances of samples with salt-fog treatment were focused on. The DC flashover voltage, hydrophobicity, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and dielectric parameter were investigated. It was found that the samples’ performances deteriorated after salt-fog treatment. The DC flashover voltage of HTV SR decreased in the salt-fog environment. The hydrophobicity of the material deteriorated and the static contact angle (CA) became small. Under the action of electric and thermal stress, the surface of samples after salt-fog treatment became rough and porous. The absorption peak of the hydrophobic groups decreased, indicating that the molecular chain of SR material was broken, and the filler was consumed, bringing down the arc resistance of the sample. The absorption of moisture further led to insulation performance loss and then reduced the electrical strength of the material. Degradation of physicochemical properties will eventually lead to a decline in electrical strength. View Full-Text
Keywords: silicone rubber; salt-fog; DC electrical strength; hydrophobicity; SEM; FTIR; dielectric parameter silicone rubber; salt-fog; DC electrical strength; hydrophobicity; SEM; FTIR; dielectric parameter
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MDPI and ACS Style

Zhang, Z.; Liang, T.; Li, C.; Jiang, X.; Wu, J.; Wu, B. Electrical Strength and Physicochemical Performances of HTV Silicone Rubber under Salt-Fog Environment with DC Energized. Polymers 2020, 12, 324. https://doi.org/10.3390/polym12020324

AMA Style

Zhang Z, Liang T, Li C, Jiang X, Wu J, Wu B. Electrical Strength and Physicochemical Performances of HTV Silicone Rubber under Salt-Fog Environment with DC Energized. Polymers. 2020; 12(2):324. https://doi.org/10.3390/polym12020324

Chicago/Turabian Style

Zhang, Zhijin; Liang, Tian; Li, Chen; Jiang, Xingliang; Wu, Jian; Wu, Bin. 2020. "Electrical Strength and Physicochemical Performances of HTV Silicone Rubber under Salt-Fog Environment with DC Energized" Polymers 12, no. 2: 324. https://doi.org/10.3390/polym12020324

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