Comparison of breakdown voltage of vegetable olive with mineral oil, natural and synthetic ester liquids under DC voltage

Reffas, Abderrahim; Béroual, Abderrahmane; Moulai, H.

doi:10.1109/tdei.2020.008308

Cited by 22 publications

(7 citation statements)

References 19 publications

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“…In general, the stopping length of streamers propagating in synthetic esters is longer than that of streamers in mineral oil, for the same experimental conditions. The well-known relationship that the stopping length increases with the applied voltage is valid also in the case of ester liquids for both voltage polarities [59,60,63,77,78,86].…”

Section: Breakdown Voltage and Associated Phenomenamentioning

confidence: 63%

“…However, the obtained results in each case exceed 60 kV, which is enough of a value for the dielectric liquids to be applied in devices of nominal voltages equal to 69 kV or higher. The available data are limited in the case of DC stress-based tests of synthetic esters [75][76][77]. In [75,77] the authors compared simply the DC-BDV between selected types of dielectric liquids and their mixtures in a quasi-uniform electric field created by a sphere-to-sphere electrode system.…”

Section: Ac and DC Breakdown Voltagementioning

confidence: 99%

“…The available data are limited in the case of DC stress-based tests of synthetic esters [75][76][77]. In [75,77] the authors compared simply the DC-BDV between selected types of dielectric liquids and their mixtures in a quasi-uniform electric field created by a sphere-to-sphere electrode system. When comparing liquids alone, there are no obvious differences between them.…”

Section: Ac and DC Breakdown Voltagementioning

confidence: 99%

“…Still, the synthetic ester seems to have the best properties under DC. In [77], Reffas et al tested the liquids under DC voltage and found that olive oil (a new type of vegetable oil) seems to be the most resistant against DC stress for both polarities. However, a synthetic ester is comparable quantitively with mineral oil.…”

Section: Ac and DC Breakdown Voltagementioning

confidence: 99%

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A Review on Synthetic Ester Liquids for Transformer Applications

et al. 2020

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Synthetic esters have become more and more popular in last few decades, explaining the increasing number of units filled with this liquid year by year. They have been investigated under different aspects, both from the fundamental point of view and breakdown mechanisms, well as from the application point of view. However, their use in high voltage equipment is always a challenge and deeper knowledge of the various aspects that can be encountered in their exploitation is needed. The intent of this review paper is to present the recent research progress on synthetic ester liquid in relation to the selected issues, most important for ester development in the authors’ opinion. The described issues are the breakdown performance of synthetic esters, lightning impulse strength and pre-breakdown phenomena of synthetic esters, synthetic esters-based nanofluids, combined paper-synthetic ester based insulating systems, application of synthetic ester for retro-filling and drying of mineral oil-immersed transformers, DGA(dissolved gas analysis)-based diagnosis of synthetic esters filled transformers as well as static electrification of synthetic esters. The different sections are based both on the data available in the literature, but above all on the authors’ own experience from their research work on synthetic ester liquids for electrical application purposes.

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Section: Breakdown Voltage and Associated Phenomenamentioning

confidence: 63%

Section: Ac and DC Breakdown Voltagementioning

confidence: 99%

Section: Ac and DC Breakdown Voltagementioning

confidence: 99%

Section: Ac and DC Breakdown Voltagementioning

confidence: 99%

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A Review on Synthetic Ester Liquids for Transformer Applications

et al. 2020

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“…This is possibly due to the fact that NEI oil is hydrophilic (i.e., a substance that attracts water) and thus, the oil is capable of mixing well with water and dissolve water. In addition, the water saturation limit of the NEI oil is 5-8 times greater than that of the MI oil [4], [15]- [18]. The electrical stress may influence the molecular bonds (breakdown of C-H bond) of the MI oil, which reduces its breakdown voltage [18]- [24].…”

Section: Resultsmentioning

confidence: 99%

Effect of repeated electrical breakdowns on mineral and natural ester insulating oils

et al. 2021

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Transformer insulating oils are exposed to repeated electrical discharge or breakdowns inside power transformers. Durability tests are conducted to analyze the ability of oil to resist decomposition due to such high electrical stresses. With the increasing demand for alternative insulating oils for oil-immersed transformers, it is worthy to compare the performance of different types of insulating oils (conventional mineral-based insulating oil and natural ester-based insulating oil) under repeated electrical breakdown. In this paper, the AC breakdown voltage of different mineral-based and natural ester-based insulating oils is reported. Durability tests were conducted based on the AC breakdown voltage behavior of insulating oils after 50 electrical breakdown shots. The AC breakdown voltage of each insulating oil sample was assessed according to the ASTM D1816 standard test method. Based on the results, it can be concluded that the dissimilarity in chemical composition of the insulating oils has a significant effect on the AC breakdown voltage behavior of these oils under repeated electrical breakdowns.

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