Silicone insulators of power transmission lines with a variable inorganic load concentration: Electrical and physiochemical analyses

Cardoso, Rodolfo C.; Balestro, Ana Claudia; Dellallibera, Adriano; Costa, Éder Silva; Angelini, Joceli Maria Giacomini; Mei, Lucía Helena Innocentini

doi:10.1016/j.measurement.2013.12.030

Cited by 14 publications

(10 citation statements)

References 5 publications

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“…They can be either "dumb-bell" or "ring" test pieces [12]. The most common shape of the test pieces for this test, when referring to composite insulators, is the dumb-bell shaped test pieces [18,20,22,23].…”

Section: Tensile Strength and Elongation At Break Testmentioning

confidence: 99%

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A Proposal for the Evaluation of HTV Silicone Rubber Composite Insulators

2021

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This paper describes in detail a step-by-step methodology for obtaining specimens from the housing material (high temperature vulcanized (HTV) silicone rubber with aluminum trihydrate (ATH) filler) of composite insulators (finished products), for five well known and commonly used tests. The aim of the paper is to render practical clarifications and additions to the instructions for five tests on composite insulators provided by international standards. Additionally, the ranges of the results of these tests are presented. More specifically, shore A hardness measurement, tensile strength and elongation at break test, tear strength test, density measurement and inclined plane test were conducted on the housing material of ten, new, unaged medium voltage composite insulators made by six different manufacturers. The results of these tests are presented as a contribution to the existing knowledge and a comparative study of corresponding results of previous investigations is performed. The presented procedures for specimens’ preparation, as well as the results (arithmetical ranges), could be used as guidelines for future testing on the housing material (HTV silicone rubber with ATH filler) of composite insulators, either by researchers and manufacturers, during laboratory testing and material development processes, or by customers (distribution and transmission networks owners), during batch acceptance tests.

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Section: Tensile Strength and Elongation At Break Testmentioning

confidence: 99%

“…The results of the above tests on the insulating housing of composite insulators depend on the concentration of ATH in the silicone rubber, as well as on the manufacturing process followed by each manufacturer [5,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

A Proposal for the Evaluation of HTV Silicone Rubber Composite Insulators

2021

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“…Silicone sealants are also massively used in the industry thanks to their good thermal stability over a wide range of temperature, UV resistance, antioxidative properties, and high hydrophobicity [6,7]. The electrical insulation also brings about the usage of silicone rubbers in electronic and electrical devices and apparatus [8]. More recently, silicone composites are increasingly utilised in several emerging sectors such as soft robotics [9,10,11,12,13], flexible electronics [14,15], and energy harvesters [16,17,18] due to their large stretchability, reduced dissipative behaviour and other thermal, physical, mechanical, and biological behaviour.…”

Section: Introductionmentioning

confidence: 99%

On the stress recovery behaviour of Ecoflex silicone rubbers

Liao

Yang

Hossain

et al. 2021

International Journal of Mechanical Sciences

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Silicone rubbers are promising materials that have extensively been used in many areas, including wearable electronic devices, actuator materials in soft robotics, and energy harvesters. Ecoflex, a commercially available polymer, is a group of silicone rubbers appearing with various Shore hardnesses that has become popular in recent years. While silicone rubbers in their real applications are subjected to repeated loadingunloading conditions, their mechanical behaviour under cyclic loading in different deformation modes and the corresponding stress recovery behaviour are yet to be well investigated. In this contribution, we conduct loading-unloading cyclic experiments in different time gaps between the first cycle and the second cycle to demonstrate the stress recovery behaviour after stress softening happens during the first cycle. For that, three different modes of deformations, i.e., uniaxial tension, planar tension, and equibiaxial tension tests are selected. Besides, Shore hardness dependence with different strain levels is also taken into consideration. The results show that the stress softening could recover significantly with time. These findings will help to understand the mechanical behaviour of Ecoflex silicone rubbers before selecting them in practical applications that are exposed to repeated loading-unloading cycles.

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“…The composite insulators are aging gradually because of the long service time (10–15 years) and the natural deterioration due to the electric field, mechanical stress, atmospheric environment and thermal radiation [4]. The aged composite insulators cannot meet the requirements of electricity transmission, and will be discarded [5,6]. The cladding material of composite insulator is silicone rubber, and the discarding will result in resources waste and vast expanses of land occupied (Figure 2).…”

Section: Introductionmentioning

confidence: 99%

Effect of Silicone Rubber of a Waste Composite Insulator on Cement Mortar Properties

et al. 2019

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Due to the rapid growth of the electric power system, the silicone rubber composite insulator is so widely employed around the world. However, the aging damage and decommission of it inevitably generates plenty of waste silicone rubber. It takes up large amounts of land for non-degradation, which is becoming a serious environmental issue. In this paper, the effort has been made to reuse the silicone rubber of composite insulator by peeling, breaking and adding it into the cement mortar to partly replace river sand by 5%, 10%, 15%, 20% and 30% in volume. Moreover, the surface modification of silicone rubber particles with H2O2 and KOH is explored to improve hydrophilicity. The mechanical strength of silicone rubber mortar and modified silicone rubber mortar are measured in detail, and the effects of particle size, content and modification of silicone rubber on the properties of mortar are investigated. This study shows that at least a 5% addition of silicone rubber can reduce the strengths, while the 15% addition is obviously favorable for increasing the toughness. Furthermore, the mortar strength gets promoted due to the surface modification. Lastly, the superior thermal insulation and noise reduction of the mortar are obtained as the addition of silicone rubber particles, and an equation between dry apparent density and thermal conductivity of mortar has been developed.

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Silicone insulators of power transmission lines with a variable inorganic load concentration: Electrical and physiochemical analyses

Cited by 14 publications

References 5 publications

A Proposal for the Evaluation of HTV Silicone Rubber Composite Insulators

A Proposal for the Evaluation of HTV Silicone Rubber Composite Insulators

On the stress recovery behaviour of Ecoflex silicone rubbers

Effect of Silicone Rubber of a Waste Composite Insulator on Cement Mortar Properties

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