The influence of thermal aging on AC dielectric strength of transparent silicone rubbers for HV insulation

Lothongkam, Chaiyaporn; Siebler, Daniel; Heidmann, Gerd; Plath, Ronald; Gockenbach, E.

doi:10.1109/iseim.2014.6870790

Cited by 7 publications

(2 citation statements)

References 2 publications

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“…SiR is used for high voltage insulation because of its hydrophobic characteristics and hindrance to contamination that minimizes leakage current [ 6 ]. SiR has outstanding insulating properties as well as heat and weather resistance [ 7 ]. However, silicone rubber suffers from degradation due to environmental stresses such as humidity, salt fog, pollution, UV radiations, temperature, and acid rain, etc.…”

Section: Introductionmentioning

confidence: 99%

Surface Recovery Investigation of Silicone Rubber Composites for Outdoor Electrical Insulation under Accelerated Temperature and Humidity

et al. 2021

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Degradation of silicon rubber due to heat and humidity affect its performance in outdoor applications. To analyze the effects of high temperature and humidity on room temperature vulcanized (RTV) silicone rubber (SiR) and its composites, this study was performed. Five different sample compositions including neat silicone rubber (nSiR), microcomposites (15 wt% silica(SMC 15% SiO2) and 15 wt% ATH(SMC 15% ATH), nanocomposite (2.5 wt% silica(SNC 2.5% SiO2) and hybrid composite (10 wt% micro alumina trihydrate with 2 wt% nano silica(SMNC 10% ATH 2% SiO2) were prepared and subjected to 70 ˚C temperature and 80% relative humidity in an environmental chamber for 120 h. Contact angle, optical microscopy and Fourier transform infrared (FTIR) spectroscopy were employed to analyze the recovery properties before and after applying stresses. Different trends of degradation and recovery were observed for different concentrations of composites. Addition of fillers improved the overall performance of composites and SMC 15% ATH composite performed better than other composites. For high temperature and humidity, the ATH-based microcomposite was recommended over silica due to its superior thermal retardation properties of ATH. It has been proved that ATH filler is able to withstand high temperature and humidity.

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Section: Introductionmentioning

confidence: 99%

Surface Recovery Investigation of Silicone Rubber Composites for Outdoor Electrical Insulation under Accelerated Temperature and Humidity

et al. 2021

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“…8,9 The hydrocarbons present in the structure of RTV-SiR makes it a good rubber and the presence of silicon-oxygen bond enable its inorganic properties. 10 RTV-SiR materials can find their potential applications in high-voltage insulation coatings, bio-medical engineering, and aerospace applications. 11,12 RTV-SiR due to its numerous advantages over other polymeric insulators are preferred, however, these insulators degrade by the time when subjected to multiple stresses in the open environment.…”

Section: Introductionmentioning

confidence: 99%

Investigation of multiple-stresses on mechanical and thermal properties of 9000 h Aged RTV-SiR composites for high-voltage insulation

Mahmood

Amin

Khan

et al. 2020

Journal of Elastomers & Plastics

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Due to many advantages, polymer composite insulators have been extensively used for high-voltage (HV) transmission lines and substation insulations. The in-service operation, various environmental and electrical stresses degrade their mechanical and thermal characteristics. In this study, nine thousand-hour (9000 h) multi-stress (HV, heat, acid rain, salt fog, ultraviolet (UV) radiation, and humidity) accelerated lab-weathering evaluation of alumina-trihydrate (ATH) and silicon dioxide (SiO2) filled silicone rubber (SiR) composites were utilized. Moreover, to quantify the influence of multiple stresses over 9000 h lab-aging, the tensile strength, elongation at break, hardness, and thermal properties were evaluated and compared with the characterization results of neat (un-aged) composites. Winter and summer-aging cycles were designed in accordance with the actual service environment of Islamabad (Pakistan). Mechanical results of SiR blends showed a decrease in the tensile strength and the elongation at break (EAB), whereas the hardness increased over 9000 h lab-aging. The maximum deviation of ∼57.1% in tensile strength was found for hybrid samples (micro-ATH+ nano-Silica blend: SMNC), whereas the minimum change of ∼25.73% was exhibited by micro-silica-filled SiR specimen SMC3. Compared to neat blends, the maximum variation in EAB was ∼61% for a neat sample (SiR), whereas minimum change was noticed for SMC2 (of ∼31%) over 9000 h lab-aging. Additionally, after 9000 h lab-aging, the maximum (of ∼79.6%) and minimum (of ∼24.4%) variation in hardness was found for hybrid and SiR samples, respectively. Moreover, thermogravimetric (TGA) analysis showed that relative to neat samples, the thermal stability of aged specimens was decreased over weathering. Among aged specimens, only ATH filled samples (SMC1, SMC2) exhibited superior performance for a given temperature range (from 0°C to 900°C) by leaving a higher residual weight of ∼68.6% for SMC2. Hence to simulate and quantify the influence of environmental stresses over insulant performance, accelerated lab weathering can be adopted as an efficient tool.

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Accelerated aging investigation of silicone rubber/silica composites for coating of high-voltage insulators

2016

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The influence of thermal aging on AC dielectric strength of transparent silicone rubbers for HV insulation

Cited by 7 publications

References 2 publications

Surface Recovery Investigation of Silicone Rubber Composites for Outdoor Electrical Insulation under Accelerated Temperature and Humidity

Surface Recovery Investigation of Silicone Rubber Composites for Outdoor Electrical Insulation under Accelerated Temperature and Humidity

Investigation of multiple-stresses on mechanical and thermal properties of 9000 h Aged RTV-SiR composites for high-voltage insulation

Accelerated aging investigation of silicone rubber/silica composites for coating of high-voltage insulators

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