Decay-like fracture mechanism of silicone rubber composite insulator

Liang, Xidong; Bao, Weining; Gao, Yanfeng

doi:10.1109/tdei.2018.006773

Cited by 97 publications

(41 citation statements)

References 21 publications

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“…Composite insulators are widely used in overhead transmission lines all over the world, owing to their advantages of light weight, excellent contamination flashover resistance, high mechanical strength and easy installation and maintenance [1][2][3][4]. In recent years, decay-like fracture of composite insulator [5][6][7][8], a new type of fracture which is different from normal fracture [4] and brittle fracture [9][10][11][12], has appeared in China and Korea. An abnormal temperature rise of the composite insulator, which was reported as the early stage of decay-like fracture of composite insulator [5][6][7], has drawn the close attention of the operation and maintenance department of the power grid.…”

Section: Introductionmentioning

confidence: 99%

Study on heating mechanism of GRP rod in a composite insulator

Yuan

Jiang

et al. 2019

IET Science, Measurement & Technology

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Section: Introductionmentioning

confidence: 99%

Study on heating mechanism of GRP rod in a composite insulator

Yuan

Jiang

et al. 2019

IET Science, Measurement & Technology

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“…More specifically, as for the GFRP used in high voltage composite insulator, the diffusion of liquid into GFRP can increase the leakage current passing through the GFRP [27]. Furthermore, it should be stressed that the fracture of composite insulator is considered the most serious accident, the diffusion of liquids into GFRP rod and relevant corrosion behaviour can lead to the failure and fracture of high voltage composite insulator, the brittle fracture and the Decay-like fracture of high voltage composite insulator have a direct relationship with liquids diffusion and relevant corrosion behaviour [8,[28][29][30], in detail, the brittle fracture is responsible for the stress corrosion cracking under low-mechanical stress in the presence of a wet environment and the Decay-like fracture is responsible for the electrical erosion in the presence of a wet environment [31].…”

Section: Introductionmentioning

confidence: 99%

Study on liquids diffusion into and relevant corrosion behaviour of glass fibre reinforced polymer used in high voltage composite insulator

Gao¹,

Liang

Bao

et al. 2020

High Voltage

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Long-term liquids diffusion tests were performed on glass fibre reinforced polymer (GFRP) used in high voltage composite insulator. The plate-shaped GFRP specimens were immersed in three types of liquids, which high voltage composite insulator would encounter in practice, including deionised water, NaCl solution and nitric acid solution for a period of 4000 h. Chemical reaction and physical dissolution complicated the diffusion processes, which could be divided into three types based on the features of diffusion curves. Fourier transform infrared spectroscopy, scanning electron microscopy and optical interferometry were employed to investigate the chemical property, two-dimensional (2D) and 3D surface morphologies of GFRP. The results revealed that the surface layer of GFRP was destroyed to some extent depending on the type and concentration of the liquid, the maximum of profile height deviation of GFRP surface was proposed to evaluate the extent of the corrosion of GFRP, the greater the profile height deviation, the more serious the corrosion of GFRP. The present work is helpful for a better understanding of the diffusion behaviour of liquids into GFRP used in high voltage composite insulator as well as in other industry applications.

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“…Brittle fracture is one of the known mechanical failure models of high voltage composite insulator [6][7][8] which is caused by the stress corrosion cracking (SCC) of GFRP rod under low mechanical stress in the presence of acid environment [6]. As suggested by the IEEE task force report regarding brittle fracture [9], the determination and investigation of a failed composite insulator responsible for brittle fracture should be conducted from three aspects, i.e.…”

Section: Introductionmentioning

confidence: 99%

Failure analysis of a field brittle fracture composite insulator: characterisation by X‐ray photoelectron spectroscopy analysis

Gao¹,

Liang

Bao

et al. 2019

High Voltage

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In the present work, a field brittle fracture composite insulator was collected and examined with the purpose of obtaining a better understanding of the failure features. Firstly, the macroscopic and microscopic fractography of this fractured composite insulator was observed confirming that the classical brittle fracture morphology features appeared in this field failed composite insulator. Secondly, the X-ray photoelectron spectroscopy (XPS) analysis was performed on the fracture surface of the glass-fibre-reinforced polymer rod. By examining the XPS survey spectra and high-resolution XPS spectra for nitrogen, sulphur, silicon, calcium, aluminium, boron and carbon elements, the type of the glass fibre and the acid source responsible for this brittle fracture composite insulator were confirmed. Furthermore, the oxidation of the silicate network of glass fibre at the fracture surface was first observed, meanwhile, the oxidation of the epoxy resin matrix was also observed. The leaching of nonsilicate constituents leading to a high-silica glass fibre was also observed; moreover, in comparison with the calcium and aluminium elements, the boron element resides in the silicate network was more preferential to be leached. The present work provides an insight into the brittle fracture in high voltage composite insulator from chemical properties point of view.

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Decay-like fracture mechanism of silicone rubber composite insulator

Cited by 97 publications

References 21 publications

Study on heating mechanism of GRP rod in a composite insulator

Study on heating mechanism of GRP rod in a composite insulator

Study on liquids diffusion into and relevant corrosion behaviour of glass fibre reinforced polymer used in high voltage composite insulator

Failure analysis of a field brittle fracture composite insulator: characterisation by X‐ray photoelectron spectroscopy analysis

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