Life Estimation and Investigation of Dielectric Strength and Siloxane Backbone of High Voltage Silicone Rubber Composites Under Accelerated Multistress Conditions

Khattak, Abraiz; Amin, Muhammad; Khan, Abuzar; Imran, Kashif

doi:10.1007/s13369-019-03839-1

Cited by 11 publications

(3 citation statements)

References 38 publications

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“…The leakage current was measured indirectly through a resistor connected to the deadline. All the results were recorded in order of μA, it might be due to comparatively more creepage distance of 80 mm [35]. The leakage current (LC) was measured after each weathering cycle.…”

Section: Ac Leakage Currentmentioning

confidence: 99%

Performance investigation of hydrothermally stressed polyamide nanocomposites for insulation applications

Khan,

Butt,

Ahmad

et al. 2024

Mater. Res. Express

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This paper investigates the performance of novel nano ZnO filled polyamide nanocomposites under hydrothermal conditions for cable insulation applications. Neat polyamide (PA0) and its nanocomposite with 0wt.% (PA0), 1 wt.% (PA1), 3 wt.% (PA3), 5 wt.% (PA5), and 7 wt.% (PA7) of nano ZnO were prepared and subjected to accelerated hydrothermal aging conditions in a programmable chamber at 85 oC and 85% relative humidity for 300 hours. The samples were analyzed with visual inspection, hydrophobicity evaluation, optical microscopy, Fourier Transform Infrared (FTIR) spectroscopy, leakage current and UV-Vis spectroscopy after every 100 hours of aging. Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD) were employed for analyzing filler dispersion. Maximum filler dispersion was achieved in the case of 3wt.% of nanofiller. All the samples expressed surface degradation and increase in leakage current after aging. Maximum surface roughness and highest leakage current of 7µA were noticed for PA0, however PA3 expressed lowest leakage current and surface degradation. PA0 expressed the lowest hydrophobicity class of HC-3 and lowest contact angle of 75o after aging. Among the nanocomposites, PA3 expressed the highest hydrophobicity class (HC-1) and contact angle (112o) after aging. FTIR results expressed that all the samples suffered from oxidation and the C=O peaks at ~1728cm-1 increased by 120%, 100% and 120% for PA1, PA3 and PA7 respectively. The peaks of -OH group at ~3500cm-1 increased for all the sample indicating moister absorption. However, it is observed that the addition of nanofiller enhanced the overall performance of composites and among the composites PA3 performed better.

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Section: Ac Leakage Currentmentioning

confidence: 99%

Performance investigation of hydrothermally stressed polyamide nanocomposites for insulation applications

Khan,

Butt,

Ahmad

et al. 2024

Mater. Res. Express

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“…7 Similarly, the performance of RTV-SiR based composites was analyzed in multi-stressed environment, where expected lifetime was noticed to be improved with the addition of silica filler. 8 In another study, it was reported that adding nano-sized silica to polymeric materials retard the corona-induced degradation. 9 Alongside silica, ATH has also been widely explored for improving insulating properties of polymeric materials.…”

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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“…[26][27][28][29][30][31][32][33][34][35][36] A Khattak et al investigated different composites of micro, nano, micro-nano hybrid composites of RTV-SiR under multiple stresses. 37 They concluded that the nanocomposite with 5% concentration showed better performance from all other samples and the life of these samples will be about 29 years. For high-voltage insulation purposes, micro and nano-based composites are preferred due to their low cost and unique physical properties.…”

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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Life Estimation and Investigation of Dielectric Strength and Siloxane Backbone of High Voltage Silicone Rubber Composites Under Accelerated Multistress Conditions

Cited by 11 publications

References 38 publications

Performance investigation of hydrothermally stressed polyamide nanocomposites for insulation applications

Performance investigation of hydrothermally stressed polyamide nanocomposites for insulation applications

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

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

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