Transfer of hydrophobicity of polymeric insulating materials for high voltage outdoor application

Hergert, A.; Kindersberger, J.; Bar, C; Bärsch, R.

doi:10.1109/tdei.2017.006146

Cited by 29 publications

(5 citation statements)

References 4 publications

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“…Hydrophobicity transfer mainly provides a relative quantification of the transfer of the LWM fluid to a contaminated silicone rubber surface with untreated silica (SiO 2 ) powder [95]. Silica is usually applied in the form of slurry and is the preferred pollution material for reproducibility of results and hydrophobicity transfer [89].…”

Section: Screening Measurements For Outdoor High Voltage Insulationmentioning

confidence: 99%

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Self-Healing Silicones for Outdoor High Voltage Insulation: Mechanism, Applications and Measurements

et al. 2022

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This paper discusses the state of the art in the application of self-healing silicone-based materials for outdoor high-voltage insulation. Both the dynamic behavior of the dimethyl side groups of silicone rubber and the diffusion of a bulk siloxane to maintain low surface energy are respectively reported as intrinsic mechanisms responsible for the self-healing of silicone rubber. Localization, temporality, mobility, and the type of synthesis are the aspects defining the efficiency of the self-healing ability of silicone rubber. In addition, the deterioration of the self-healing ability with filler loaded into silicone rubber insulation housing composites is discussed. Taking the self-healing property into consideration among the other properties of silicone rubber insulators, such as tracking and erosion resistance, can be a useful design practice at the material development stage. Hydrophobicity retention, recovery, and transfer measurements are discussed as useful indicators of the self-healing ability of silicone rubber. Nevertheless, there remains a need to standardize them as design tests at the material development stage. The paper is intended to shed the light on the hydrophobicity recovery, a key material design parameter in the development of silicone rubber outdoor insulating composites, similar to the tracking and erosion resistance.

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Section: Screening Measurements For Outdoor High Voltage Insulationmentioning

confidence: 99%

“…In contrast, kaolin and kiesel-guhr could impede the LMW transfer and give unreproducible outcomes [96]. Besides, the ability to transfer hydrophobicity can be assessed in hydrophobicity transfer test or masking method [97], based on the time required to regain the surface hydrophobicity.…”

Section: Screening Measurements For Outdoor High Voltage Insulationmentioning

confidence: 99%

Self-Healing Silicones for Outdoor High Voltage Insulation: Mechanism, Applications and Measurements

et al. 2022

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“…The hydrophobicity transfer property is one of the most important properties of Sr. The hydrophobicity transfer of SR is that when the hydrophobic SR is covered with a hydrophilic pollution layer, the hydrophobicity of bulk SR can transfer to the pollution layer, thus turning the pollution layer hydrophobic [12,13]. This characteristic plays an important role in preventing pollution flashover caused by moisture absorption of polluted insulators in the natural environment, which leads to its largescale application in the power system.…”

Section: Introductionmentioning

confidence: 99%

Hydrophobicity changes of polluted silicone rubber introduced by spatial and dose distribution of plasma jet

Li¹,

Guo²,

Fu³

et al. 2022

Plasma Sci. Technol.

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The hydrophobicity of polluted silicone rubber was improved rapidly under plasma jet treatment. It is an important phenomenon of the interaction between the plasma jet and the porous surface and shows a wide application prospect in the power system. In this process, the spatial characteristics and dose of plasma jet are very important. Therefore, the variation of hydrophobicity of polluted silicone rubber under plasma jet treatment was studied, and the spatial characteristics and dose of plasma jet on polluted silicone rubber were also investigated in the paper. The results show that the surface property (hydrophilic or hydrophobic) depended on the dose of plasma applied to the surface. The effective treated area was a circle, and the contact angles changed along the radial direction of the circle. This was attributable to the diffusion of plasma bullets on the surface and the distribution of plasma species. The plasma dose could be characterized by the energy density of the plasma applied on the surface. With the increase of plasma dose, the surface contact angles first increased rapidly and then decreased gradually.

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“…Those insulators consist of a glass-fiber reinforced plastic rod, designed for the mechanical tensile load and a silicone rubber housing . The advantages of composite insulators compared to conventional insulators made of glass or porcelain are the lightweight construction, the persistent hydrophobia even in the case of contamination, resistance against electrical discharge processes, strength against vibration loads (cable suspension on railway overhead lines), and resistance against damages caused by vandalism. − Three-dimensional, elastomeric polymer networks can be formed by crosslinking poly(dimethylsiloxane) (PDMS) molecules, using different strategies. The most common routines in industrial applications are (metal-catalyzed) addition curing, high-temperature curing using peroxides, and condensation curing of silicone elastomers.…”

Section: Introductionmentioning

confidence: 99%

Impact of the Network Density of Rough Poly(dimethylsiloxane)-Model Systems on the Hydrophobicity Assessment and Dynamic Wetting Behavior

Praße

Kornhuber

Voit

et al. 2022

ACS Appl. Polym. Mater.

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Silicone-based elastomers are widely in use as a housing material for composite insulators, e.g., for high-voltage outdoor applications. Especially, their outstanding hydrophobic properties make them suitable for high-voltage applications since conductive electrolytic paths on the surface that result in short circuits need to be avoided. While static hydrophobicity can be analyzed by contact-angle measurements, the analysis is more difficult for moving droplets. In this paper, we show that not only dynamic contact-angle measurements should be used to evaluate the hydrophobic properties of insulator materials, but also the occurrence of the so-called pearling effect must be considered. This effect describes the instability of accelerated drops resulting in small, pinned droplets on a material surface. We observed that occurrence of the pearling effect is dependent not only on external parameters (such as droplet volume) but also on the network density of the silicone elastomer. We have synthesized variable silicone elastomers with tunable network structures by reacting vinyl-terminated poly(dimethylsiloxane) and tetrakis(dimethylsiloxy)silane via hydrosilylation. The network properties are varied by controlling the stoichiometric balance between the monomers. The well-defined materials obtained that way allowed a careful examination of the impact of network densities (i.e., mechanical properties) and low-molecular-weight residues (sol) on the hydrophobic behavior in terms of dynamic wetting.

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Transfer of hydrophobicity of polymeric insulating materials for high voltage outdoor application

Cited by 29 publications

References 4 publications

Self-Healing Silicones for Outdoor High Voltage Insulation: Mechanism, Applications and Measurements

Self-Healing Silicones for Outdoor High Voltage Insulation: Mechanism, Applications and Measurements

Hydrophobicity changes of polluted silicone rubber introduced by spatial and dose distribution of plasma jet

Impact of the Network Density of Rough Poly(dimethylsiloxane)-Model Systems on the Hydrophobicity Assessment and Dynamic Wetting Behavior

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