Uneven Aging Characteristics of Liquid Silicone Rubber Bushing Sheath for 550 kV High Voltage in Natural Environment

ZHOU Qiuhua; QIAN Cong; FENG Xinmin; DENG Jiwen; QIAO Xinhan; ZENG Wentian

doi:10.7643/issn.1672-9242.2025.06.013

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Equipment Environmental Engineering ›› 2025, Vol. 22 ›› Issue (6) : 111-119. DOI: 10.7643/issn.1672-9242.2025.06.013

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Uneven Aging Characteristics of Liquid Silicone Rubber Bushing Sheath for 550 kV High Voltage in Natural Environment

ZHOU Qiuhua¹, QIAN Cong¹, FENG Xinmin¹, DENG Jiwen¹, QIAO Xinhan^2,*, ZENG Wentian²

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Abstract

The work aims to reveal the uneven aging characteristics of 500 kV and above high-voltage, to provide important reference for the maintenance of high-voltage bushings. By methods such as scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TG), the microscopic characteristics of different parts of the high-voltage bushing sheath layer were analyzed to clarify the aging degree and mechanism of different parts, and to explore the uneven aging law of high-voltage bushings. Significant aging differences were observed in different parts of the same high-voltage bushing. The main characteristic functional groups and pyrolysis characteristics of typical parts were consistent with the microstructure and element distribution characterization results. The order of sample aging degree from high to low was upper surface of high-voltage umbrella skirt, upper surface of middle umbrella skirt, outer surface of sheath body and inner section of sheath body. Due to the mechanism of insulation material failure in the power system satisfying the "bucket" effect, the uneven characteristics can be used as a characterization method for aging degree. However, further research should summarize the uneven parameters of decommissioned bushings due to aging issues, and ultimately propose decommissioning standards based on unevenness.

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natural environment / liquid silicone rubber / high-voltage bushing / uneven aging / element distribution / thermogravimetric analysis

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ZHOU Qiuhua, QIAN Cong, FENG Xinmin, DENG Jiwen, QIAO Xinhan, ZENG Wentian. Uneven Aging Characteristics of Liquid Silicone Rubber Bushing Sheath for 550 kV High Voltage in Natural Environment[J]. Equipment Environmental Engineering. 2025, 22(6): 111-119 https://doi.org/10.7643/issn.1672-9242.2025.06.013

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