Evaluation of field-ageing effects on insulating materials of composite suspension insulators

Mavrikakis, N.; Mikropoulos, Pantelis N.; Siderakis, K.

doi:10.1109/tdei.2016.006077

Cited by 59 publications

(22 citation statements)

References 32 publications

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“…Furthermore, the authors recommended replacing gradually the insulators which were in the field more than 19.2 years. In [22], an evaluation of field-aging effects on the insulating materials (EPDM and VMQ/HCR) of 150KV costal composite suspension insulators after the same service life of 17 years has been conducted. The resistance against tracking, erosion and chalking was investigated.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of 230 kV Polymer Insulators in the Coastal Area of Saudi Arabia

et al. 2020

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This paper investigates the technical performance of 230 kV field-aged composite insulators in the coastal region of Saudi Arabia. Two insulator samples removed from the 230 kV line after 20 years of service are assessed at KFUPM High Voltage Lab (KHVL). Different assessment techniques, such as visual inspection, contact angle, surface pollution severity, electrical withstand, and material characterization are utilized to evaluate the insulator performance. Equivalent salt deposit density (ESDD) and non-soluble deposit density (NSDD) techniques are used for the surface pollution severity measurements. Clear views of surface changes and surface hydrophobicity conditions are displayed. Scanning electron microscope (SEM), energy dispersive x-ray spectrometry (EDX), and Fourier-transform infrared spectroscopy (FTIR-IR) techniques are utilized for the material characterization. The visual inspection reveals small and big cracks in the insulator sheds. Hard breakable portion areas, many shed cuts, changed color areas, and whitish parts are visually noticed in the insulator surface. Such changes confirm the aging condition effect of the insulator units. Furthermore, the samples are subjected to laboratory clean fog tests to check the electrical performance of the samples. Informative results are given for the current condition and performance for the 20-years, fieldaged insulators. Additionally, the experimental results are presented for the rest of the insulator life period. Utilization of the existing line insulators has been evaluated. Finally, discussions and recommendations for the future handling of the insulators at the 230 kV line are highlighted.

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Section: Introductionmentioning

confidence: 99%

Performance Evaluation of 230 kV Polymer Insulators in the Coastal Area of Saudi Arabia

et al. 2020

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“…For external environmental conditions, polymer insulators are widely used and accepted over the period of the last four decades for medium high voltage applications. 1 Among the polymers, silicone rubber, ethylene propylene diene monomer (EPDM), epoxy, and thermoplastic elastomers are the well-known base materials used for the preparation of composite insulators. 2 From all the polymers, silicone rubber gained more popularity due to its improved hydrophobicity characteristics.…”

Section: Introductionmentioning

confidence: 99%

Long-term aging characteristics of co-filled nano-silica and micro-ATH in HTV silicone rubber composite insulators

Rashid

Saleem

Amin

et al. 2020

Polymers and Polymer Composites

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Multiple environmental stresses produce complex phenomena of aging in polymeric insulators. The main aim of this research is to investigate the improved aging characteristics of silica (SiO2)/alumina trihydrate (ATH) hybrid samples (HSs) in high-temperature vulcanized rubber. For this purpose, three HSs comprising 20% micro-ATH with 2% nano-SiO2 (S2), 4% nano-SiO2 (S4), 6% nano-SiO2 (S6) along with sample-virgin (SV) are subjected to long-term accelerated aging of 9000 h. A special aging chamber is fabricated for the aging process of samples. The aging characteristics of these samples are investigated by measuring leakage current (LC) and hydrophobicity classification (HC) after every weathering cycle. Similarly, Fourier transform infrared (FTIR) spectroscopy is performed to observe the important structural changes over the entire aging time. The dielectric strength of AC is also performed after every 1000 h of aging. Tracking and erosion resistance and mechanical properties are also investigated before and after aging. From the critical investigation, it is observed that HSs possess improved results in all the conducted tests. S2 has the lowest LC and HC values throughout the aging time. Similarly, S6 described the highest breakdown strength at the end of the accelerated aging. In the case of FTIR, it is analyzed that the important wave numbers remain intact for all the HSs in the accelerated aging environment. The loss percentage in the wave number for SV is higher, compared to the HSs. After performing the tracking and erosion resistance test, HSs have superior performance. For some of the mechanical properties, HSs showed improved values. Thus, from the experimental analysis, it is deducted that the sample S2 offers the highest resistance to the aging conditions, compared to the SV and other HSs.

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“…Power system transmission and distribution insulators are one of the most effective equipment in the reliability of the power grid. In recent years, the use of polymeric insulators has become commonplace due to better performance in the humid and contaminated conditions [1].…”

Section: Introductionmentioning

confidence: 99%

Distinguishing polymeric insulators PD sources through RF PD measurement

Abedini-Livari

Firuzi

Vakilian

2020

IET Generation, Transmission & Distribution

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Evaluation of field-ageing effects on insulating materials of composite suspension insulators

Cited by 59 publications

References 32 publications

Performance Evaluation of 230 kV Polymer Insulators in the Coastal Area of Saudi Arabia

Performance Evaluation of 230 kV Polymer Insulators in the Coastal Area of Saudi Arabia

Long-term aging characteristics of co-filled nano-silica and micro-ATH in HTV silicone rubber composite insulators

Distinguishing polymeric insulators PD sources through RF PD measurement

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