Ester oils and flow electrification hazards in power transformers

Paillat, T.; Zelu, Y.; Morin, Gérard; Perrier, C.

doi:10.1109/tdei.2012.6311498

Cited by 21 publications

(8 citation statements)

References 8 publications

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“…Figure 5 shows a comparison between the three oils (vegetable, mineral and synthetic) for each type of paper. We observe that, whatever the type of paper, the ECT generated in vegetable oil is the most important confirming the literature data [5]. Nevetheless, attention must be paid on the fact that only charge generation is measured in this study.…”

Section: Resultssupporting

confidence: 87%

“…Many studies have been dedicated to the electrostatic charging tendency (ECT) of mineral oil and measurement of the leakage current generated by the charge concentration gradient at the oil/pressboard interface versus many parameters (nature of the pressboard, temperature, ageing, streaming rate (speed) …), using different test cells, to understand this phenomenon. Some studies have been also conducted with natural ester oils on the charge generation using ministatic charge tester and the charge accumulation resulting of oil circulation in a test loop [5].…”

Section: Introductionmentioning

confidence: 99%

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Investigation on static electrification phenomenon of ester liquids and mineral oil

Béroual¹,

Sadaoui²,

Coulibaly³

et al. 2015

2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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This paper aims at the comparison of the Electrostatic Charging Tendency (ECT) of mineral, vegetable and synthetic oils using a spinning disk system (CIGRE Cell) covered on its both sides with different types of pressboards and papers. The ECT of insulating oils generated by the charge concentration gradient at the oil -pressboard/paper interfaces are analyzed in function of the rotating speed of the disk. It is shown that the generated charge is slightly higher with vegetable oil than that with mineral and synthetic ester oils. This may be due to differences in the molecular structures of these oils, whose interaction with the pressboard/paper is different; the phenomena occurring at the double-layer (interface) are not identical. However, the differences observed do not constitute an obstacle to the use of vegetable oil as a substitute for mineral or synthetic oils, with respect to the problems and risks associated with static electrification phenomena. Keywords-Electrostatic Charging Tendency (ECT), natural and synthetic ester oils, mineral oil, spinning disk system.I.

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Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Investigation on static electrification phenomenon of ester liquids and mineral oil

Béroual¹,

Sadaoui²,

Coulibaly³

et al. 2015

2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

Self Cite

View full text Add to dashboard Cite

show abstract

“…Certainly, the definite relation between the electrification degree of oil flow and electrostatic current must be acquired before the calculation. That is to say, the mathematical expression of the relation between the electrification degree of oil flow and the electrostatic current must be researched [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Research on the Relation between Transformer Oil Flow Electrification and Electrostatic Current

Fu¹,

Wang²,

Zou³

et al. 2015

Journal of Electrical Engineering and Technology

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-In order to study and obtain the mathematical relation between the electrification degree of transformer oil flow and the electrostatic current, a small amount of data about the electrification degree of oil flow and the corresponding electrostatic current is studied by linear regression method and grey model method. The results show that the linear correlation between the electrification degree and the electrostatic current was not good, and the relation between the electrification degree of oil flow and electrostatic current (i) could be expressed as ρ (0) =0.2049 i (0) +169.4419 according to grey model GM (0, 2) when the electrification degree of oil flow is represented by the charge number generated from transformer oil per unit volume, namely the charge density (ρ).

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“…Deste modo, os óleos minerais isolantes devem ter suas propriedades constantemente avaliadas, de modo rápido e seguro, a fim de que medidas preventivas e/ou corretivas possam ser efetuadas em um tempo adequado, evitando prejuízos às empresas do setor e aos consumidores em geral. 4 A determinação de elementos metálicos nos óleos minerais isolantes deve ser realizada regularmente a fim de acompanhar a possível deterioração, por corrosão, das partes metálicas dos transformadores, bem como avaliar a qualidade dos mesmos no que diz respeito à presença de possíveis agentes catalisadores de sua degradação, o que levaria a uma rápida diminuição do seu tempo de vida útil.…”

Section: Introductionunclassified

Evaluation of Different Methods for Copper Determination in Insulating Oils by Graphite Furnace Atomic Absorption Spectrometry

Caldas¹,

Paula²,

Brum³

et al. 2014

Química Nova

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Ester oils and flow electrification hazards in power transformers

Cited by 21 publications

References 8 publications

Investigation on static electrification phenomenon of ester liquids and mineral oil

Investigation on static electrification phenomenon of ester liquids and mineral oil

Research on the Relation between Transformer Oil Flow Electrification and Electrostatic Current

Evaluation of Different Methods for Copper Determination in Insulating Oils by Graphite Furnace Atomic Absorption Spectrometry

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