Application of unusual techniques for characterizing ageing on polymeric electrical insulation

Saldivar-Guerrero, R.; Hernández-Corona, R.; López-González, Fernando; Rejón-García, Leonardo; Romero-Baizabal, V.

doi:10.1016/j.epsr.2014.08.019

Cited by 18 publications

(6 citation statements)

References 13 publications

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“…To determinate the contact angle characterizing the hydrophobicity, a photo of the drop was taken by a digital camera and treated using the AutoCAD software. [ 18 ] This procedure is equivalent to using a goniometer. [ 8 ] The photo in Figure 2 shows the implemented experimental set up.…”

Section: Methodsmentioning

confidence: 99%

Electrical insulation properties of silicone rubber under accelerated corona and thermal aging

Belhiteche

Rondot

Moudoud

et al. 2020

Polymer Engineering & Sci

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A contactless method based on energy shift of high‐energy cut‐off of the x‐ray bremsstrahlung, the so‐called Duane Hunt Limit and a conventional low voltage electrical technique (three‐probes technique) is applied on thermal and corona aged silicone rubber (SiR) to measure, respectively, the surface potential, Vs, and the surface resistivity, ρs. The effect of aging on these quantities, representing the dielectric properties, is studied. The results are highly reproducible and highlight a good correlation between Vs and ρs. It was observed that thermal aging combined with electrical aging deteriorates more the electrical properties of the polymer than thermal aging alone. Explanations for electrical characteristics (Vs, ρs) change with aging are supported by attenuated total reflection Fourier transform infrared spectroscopy spectra analysis and a chemical mechanism of aging in three steps (i.e., oxidation‐polycondensation, degradation, and thermal cracking). The surface degradation of the polymer is revealed by images of surface morphology obtained by using scanning electron microscopy (SEM). Roughness is greater for combined thermal and corona aging mode compared to thermal aging alone. In addition, the surface degradation of SiR polymer is confirmed by the loss of its hydrophobicity.

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Section: Methodsmentioning

confidence: 99%

Electrical insulation properties of silicone rubber under accelerated corona and thermal aging

Belhiteche

Rondot

Moudoud

et al. 2020

Polymer Engineering & Sci

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“…In general, since there is no specific threshold values for the measurement, the roughness condition will be used as the comparison purposes [17]. For instance, in one case study whereby an accelerated test is carried out and the researchers have made the conclusion that, for the ethylene propylene diene monomeraluminium trihydrates (EPDM-ATH) surge arrester, the value of Ra has doubled from the original value when 1000 hours test have been performed [12]. Figure 1.…”

Section: Definition Of Surface Roughnessmentioning

confidence: 99%

“…This will make the outer layer of the insulator to be relieved with a layer composed of polymer and exposed fillers. Thus, this condition will cause the roughness value to rise, and will provide much more information regarding on the polymer surface degradation [12].…”

Section: Relationship Of Ra With Insulator Age and Environmental Stressmentioning

confidence: 99%

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Surface roughness condition of field-aged polymer insulators at different installation area

Din

Piah

Abdullah

et al. 2019

IJEECS

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<span>This paper presents surface degradation assessment based on surface roughness condition for various field-aged high voltage polymer insulators that were installed at different locations. The measurement of arithmetical mean surface roughness is done, and statistical analysis is implemented in this study. Three groups of insulators labeled as 6 years, 12 years, 18 years, and with their respective controlled samples are tested using a surface roughness tester. Data measurements from the testing are analyzed in conjunction with visual observation to investigate an indication of surface degradation within the groups. Further statistical analysis is applied for the comparison of the surface roughness conditions. In order to observe the environmental stress factors that will affect the roughness condition, within the installation area, the virtual three-dimensional mapping program represented the Earth based on satellite imagery is utilized. The correlation analysis on all that three groups has indicated the positive outcomes with the roughness increased with respect to the age of insulator that located in quite similar environmental stress conditions. Regardless of the age of an insulator, the degradation due to surface roughness condition can be used to indicate what levels of environmental stress around the installation area have.</span>

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“…The AMW in the laboratory is preferred over the field/natural aging because it takes less time and the insulators can be analyzed after an equal interval of times during the aging. 25 Many research scholars in their work have investigated different types of environmental effects on the performance of the nano, micro, and hybrid composite polymeric as well as epoxy insulators under mechanical, electrical, and chemical stresses. [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.…”

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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Application of unusual techniques for characterizing ageing on polymeric electrical insulation

Cited by 18 publications

References 13 publications

Electrical insulation properties of silicone rubber under accelerated corona and thermal aging

Electrical insulation properties of silicone rubber under accelerated corona and thermal aging

Surface roughness condition of field-aged polymer insulators at different installation area

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

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