Failure of high voltage electrical insulators with pultruded glass fibre-reinforced plastic cores

Owen, M. J.; Harris, S.J.; Noble, B.

doi:10.1016/0010-4361(86)91005-0

Cited by 31 publications

(7 citation statements)

References 10 publications

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“…The insulating properties and hydrophobicity of these composite sheds depend on factors including shed shape, filler type, resin type, polymer surface roughness, mixing method, and production conditions (Owen et al, 1986;Chateauminois et al, 1994;Kumosa et al, 2005;Raji et al, 2006;Naebe et al, 2016).…”

Section: Open Access Edited Bymentioning

confidence: 99%

Chemical composition optimization of nanocomposites used for shed and core of outdoor composite insulators

Gafti

Taherian²,

Kiahoseini³

2022

Front. Mater.

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Outdoor 24-kV power transmission insulators include two main pieces, namely, the shed and core. In this study, these pieces were manufactured separately by roll/hot pressing and hand lay-up methods, respectively. Both shed and core were formed from polymer-based composites due to their low weight, high strength-to-weight ratio, and higher moisture and pollution resistance compared to those of ceramic and glass sheds. The sheds were made from silicone rubber as the matrix and alumina trihydrate (ATH) and TiO2 as additives in single- and double-filler composites. The characterization tests of the sheds included variable (max stability voltage) and constant (dry, wet, and notched max endurance voltage, as well as erosion) voltage tests, in addition to contact angle tests. The results of these analyses demonstrated that silicone rubber reinforced with 5 wt.% TiO2 was the best shed material based on its hydrophobicity. The core of the insulator was made of epoxy reinforced with different glass fiber percentages (10, 13, and 15 wt.%). The manufacturing method was hand lay-up. Tensile strength and scanning electron microscopy (SEM) were used for characterization.

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Section: Open Access Edited Bymentioning

confidence: 99%

Chemical composition optimization of nanocomposites used for shed and core of outdoor composite insulators

Gafti

Taherian²,

Kiahoseini³

2022

Front. Mater.

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“…Early in the 1980s, Owen et al in the University of Nottingham gathered and studied ten composite insulators [3], three tension insulators of which were fractured. They state that the interaction of electrical field and the moist environment together with the loads are responsible for fracture happen.…”

Section: Introductionmentioning

confidence: 99%

Residual mechanical strength evaluation of crimping assembled composite insulators with service time of 10–14 years

Xiong

Wang

Yao

et al. 2019

IET Generation, Transmission & Distribution

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“…As compared to traditional porcelain insulators, composite insulators offer significant advantages such as a high mechanical strength-to-weight ratio, improved damage tolerance, flexibility, good impact resistance, and ease of installation. In spite of the many benefits that these composite insulators potentially offer, caution should be observed when they are used in applications that are susceptible to failure by brittle fracture [1,2,[4][5][6][8][9][10]14,15,17,19,21,22,24,[26][27][28].…”

Section: Introductionmentioning

confidence: 99%

“…Brittle fracture of composite insulators results from stress corrosion cracking (SCC) of the composite rod material [1,2,[4][5][6][8][9][10]14,15,17,19,21,22,24,[26][27][28]. SCC in an E-glass/polymer composite is a consequence of chemical attack on the fibers by an acid (either organic or inorganic) in conjunction with low mechanical tensile stresses applied along the rod axis [29][30][31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Stress Corrosion Properties of Pultruded Glass Fiber/Polymer Composite Materials

Ely¹,

Armentrout²,

Kumosa

2001

Journal of Composite Materials

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A series of stress corrosion experiments were performed on 12 pultruded glass fiber composite materials (two fibers in six different matrices) commonly used in high voltage composite insulators. In this study two types of glass fibers were investigated, namely E-glass and ECR-glass. The tests were performed in nitric acid solutions (pH 1.2) using constant KI specimens that were specifically designed for the stress corrosion testing of unidirectional fiber/polymer matrix composites. The effect that the magnitude of the applied load had on the stress corrosion fracture process was investigated using acoustic emission (AE) methods. Post-test analysis of the test samples revealed that when the specimens were subjected to static loads ranging from 71.2 to 124.6 N in the presence of nitric acid, planar cracks formed and propagated perpendicular to the fiber direction without generating a significant degree of fiber debonding or pullout. The results showed that the E-glass/polymer unidirectional composites were not immune to stress corrosion cracking in nitric acid. On the other hand, the ECR-glass/polymer composites showed no evidence of stress corrosion formation under any of the loading conditions considered. Furthermore, the test results clearly demonstrate that the constant KI stress corrosion tests are a suitable experimental method for evaluating stress corrosion properties of unidirectional glass fiber/polymer matrix composites. In particular, by using the constant KI specimen geometry, the crack propagation rates in the composites under the stress corrosion conditions can be very accurately determined.

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Failure of high voltage electrical insulators with pultruded glass fibre-reinforced plastic cores

Cited by 31 publications

References 10 publications

Chemical composition optimization of nanocomposites used for shed and core of outdoor composite insulators

Chemical composition optimization of nanocomposites used for shed and core of outdoor composite insulators

Residual mechanical strength evaluation of crimping assembled composite insulators with service time of 10–14 years

Evaluation of Stress Corrosion Properties of Pultruded Glass Fiber/Polymer Composite Materials

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