Anti-aging characteristics of RTV-SiR aided HV insulator coatings: Impact of DC polarity and fillers

Ullah, Israr; Akbar, M.S.

doi:10.1016/j.matchemphys.2021.125634

Cited by 10 publications

(6 citation statements)

References 41 publications

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“…It was revealed that negative polarity exhibits lower aging effect on the coating in comparison with the positive DC polarity that shows more degradation phenomenon. In addition, the positive polarity results in higher leakage current than the samples under negative polarity owing to more surface conductivity due to the migration of more ions under DC-positive polarity [87]. These results can confirm that the higher rate of degradation of SiR coatings, more severe pollution effect, and greater hydrophobicity loss occur under DC-positive polarity.…”

Section: Effect Of Electrical and Environmental Stresses On Self-heal...mentioning

confidence: 54%

“…These results can confirm that the higher rate of degradation of SiR coatings, more severe pollution effect, and greater hydrophobicity loss occur under DC-positive polarity. It was reported that the positive polarity effect has a more damaging effect and less of a hydrophobicity retention effect on SiR insulators [87,88].…”

Section: Effect Of Electrical and Environmental Stresses On Self-heal...mentioning

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: Effect Of Electrical and Environmental Stresses On Self-heal...mentioning

confidence: 54%

Section: Effect Of Electrical and Environmental Stresses On Self-heal...mentioning

confidence: 99%

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

et al. 2022

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“…One of the most effective approaches for testing the performance of polymeric insulators is multi-stress aging. Different types of multi-stress aging experiments have been performed till now on different polymeric materials [ 9 , 10 , 11 , 12 , 13 ]. However, mostly they are performed for a short interval of time which does not predict the actual life expectancy of polymeric insulators.…”

Section: Introductionmentioning

confidence: 99%

Lifetime Estimation and Orientation Effect Based on Long-Term Degradation Analysis of Thermoset and Thermoplastic Insulators

Ullah

Amin

et al. 2022

Polymers

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Polymeric insulators have replaced ceramic insulators due to their obvious properties like low surface energy, which exhibits good hydrophobic performance, low weight, etc. However, electric utilities have concerns about their long-term performance. In that context, the long-term performance of two different types of polymeric insulators are investigated in this study: thermoset Silicone rubber (SiR) and thermoplastic elastomeric (TPE). Multi-stress aging was performed in the different orientations of both types of polymeric insulators. During multi-stress aging, insulators are exposed to varied loads in both vertical and horizontal orientations, simulating actual service environmental conditions. Experiments were done in a chamber where different types of stresses were simulated, which resembles the weathering conditions of Hattar, Pakistan, which is one of the most polluted industrial zones. Both insulators were stressed in a chamber under the designed weathering conditions for two years and six months at different orientations. Polymeric insulators made of SiR perform better in the vertical position than that in the horizontal position. Furthermore, the experimental results show that both materials are capable in a variety of situations. SiR, on the other hand, performed well due to its high hydrophobicity, which means it is less impacted by contaminants and hence has a longer life and higher service performance than TPE.

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“…[28][29][30] More recent efforts to evaluate impact of both polarities of DC applied voltage, accompanied by various environmental stresses, on silicone rubber materials reinforced with different concentration of micro/ nano-sized ATH/silica are reported by I Ullah and M Akbar. 31,32 In the present study aiming at suggesting better material for enhancing performance under the combined effects of DC voltage and natural stresses, three types of RTV-SiR, one without any filler and the other two doped with nano-silica and micro-ATH were investigated. In conjunction to this, the previously reported lab aging time of 5000 hours was extended to 9000 hours (∼ 1 year) to further examine the impact of longer duration on materials' deterioration.…”

Section: Introductionmentioning

confidence: 99%

“…28–30 More recent efforts to evaluate impact of both polarities of DC applied voltage, accompanied by various environmental stresses, on silicone rubber materials reinforced with different concentration of micro/nano-sized ATH/silica are reported by I Ullah and M Akbar. 31,32…”

Section: Introductionmentioning

confidence: 99%

RTV-SiR based composites aged in a multi-stressed environment under AC and bipolar DC voltages

Mahmood

Alam

2022

Journal of Elastomers & Plastics

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Silicone rubber-based polymers are gradually replacing traditional insulators in outdoor applications due to their numerous advantages, in particular high hydrophobicity that is important for suppressing leakage current and hence surface flashover. However, the main problem with polymeric composites is their aging when exposed to environmental stresses causing loss of their desired properties and expected lifetime. In this work, aging behavior of three types of room temperature vulcanized silicon rubber (RTV-SiR) loaded with nano-silica and micro-ATH is studied. Samples of the materials with different specifications were fabricated and exposed to various environmental stresses in two specially designed weather chambers under both AC and bipolar DC voltages for a time period of 9000 hours. Thereafter, diagnosis was performed for identifying the degree of deterioration using several techniques. These include hydrophobicity classification, measurements of leakage current and mechanical properties, Fourier transform infrared spectroscopy, and Thermogravimetric analysis. Results of the conducted experiments indicated stronger degradation of the desired properties under positive DC stress as compared to the AC and negative DC voltages. Moreover, silicone rubber doped with nano-sized particles of silica filler demonstrated better anti-aging performance as compared to its micro-ATH filled counterpart.

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Anti-aging characteristics of RTV-SiR aided HV insulator coatings: Impact of DC polarity and fillers

Cited by 10 publications

References 41 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

Lifetime Estimation and Orientation Effect Based on Long-Term Degradation Analysis of Thermoset and Thermoplastic Insulators

RTV-SiR based composites aged in a multi-stressed environment under AC and bipolar DC voltages

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