Lightning Impulse Testing of Natural Ester Fluid Gaps and Insulation Interfaces

Rapp, Kevin; Corkran, J.; McShane, C.P.; Prevost, Thomas

doi:10.1109/tdei.2009.5361579

Cited by 64 publications

(14 citation statements)

References 13 publications

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“…Several groups of investigators (Perrier et al, 2004;Beroual et al, 1998;Rapp et al, 2009;Dang et al, 2012) have reported higher power frequency breakdown strength of conola oil as compared to mineral oil.…”

Section: Electrical Characteristics Of Selected Oilsmentioning

confidence: 99%

“…Researches on prebreakdown and breakdown phenomena of mineral based insulating liquids have been progressing since 1950s (Sharbaugh et al, 1978;Beroual et al, 1998) respectively. Martin and W ang (2008); Rapp et al (2009) and Yasuda et al (2010) exemplify the use of vegetable oils for dielectric applications in power distribution transformers and other high voltage equipments. Nevertheless, recently transformer-grade vegetable oils are also commercially available.…”

Section: Introductionmentioning

confidence: 99%

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Optical observation of streamer propagation and breakdown in seed based insulating oil under impulse voltages

2014

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Increasing demand of electricity and high consumption of natural fuel resources has raised countless challenges for the electricity industry. For years, transformers were equipped with mineral oil for better and lasting performance but the recent uncertainty about the future of oil availability is motivating the researchers to find out the "Green Insulating Oils" for transformers. Thus, green insulating oils are being probed with great interest at research centers worldwide. In this paper, Canola oil was studied for applications in transformers as a sustainable solution. It presents experimental results of a comparative study of initiation and propagation of streamers in canola seed based oil and mineral insulating oil when subjected under standard lightning impulse voltages. Moreover, streamer patterns, modes of propagation and their stopping lengths were investigated under both polarities of voltage in point-plane electrode gap. The paper concludes with six different findings, which states that canola oil is a better and sustainable choice of oil for transformer use.

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Section: Electrical Characteristics Of Selected Oilsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optical observation of streamer propagation and breakdown in seed based insulating oil under impulse voltages

2014

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“…This is also the reason why currently such fluids are deployed in Europe sporadically, mainly in headquarters or showrooms of international corporations or in specially protected areas. Less known are problems of virtually no legislative path allowing wider industrial use of natural esters, and durability problems in the terms of short high voltage impulse resistance [9,10], etc. Natural esters do also have advantages, e.g., lower degree of polymerization of cellulose compared to mineral fluids [11], high flash point [12] and inherent "moisture tolerance" [13].…”

Section: Introductionmentioning

confidence: 99%

Development of a Biodegradable Electro-Insulating Liquid and Its Subsequent Modification by Nanoparticles

et al. 2018

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Abstract:The paper is focused on the possibility of replacing petroleum-based oils used as electro-insulating fluids in high voltage machinery. Based on ten years of study the candidate base oil for the central European region is rapeseed (Brassica napus) oil. Numerous studies on the elementary properties of pure natural esters have been published. An advantage of natural ester use is its easy biodegradability, tested according to OECD-301D (Organisation for Economic Co-operation and Development) standard, and compliance with sustainable development visions. A rapeseed oil base has been chosen for its better resistance to degradation in electric fields and its higher oxidation stability. The overall ester properties are not fully competitive with petroleum-based oils and therefore have to be improved. Percolation treatment and oxidation inhibition by a phenolic-type inhibitor is proposed and the resulting final properties are discussed. These resulting fluid properties are further improved using titanium dioxide (TiO 2 ) nanoparticles with a silica surface treatment. This fluid has properties suitable for use in sealed distribution transformers with the advantage of a lower price in comparison with other currently used biodegradable fluids.

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“…The molecules comprising the dielectric act as sources of electrons and the electronic properties of the molecules play an important role in streamer initiation and propagation. Many studies have investigated streamer propagation and breakdown in natural esters under high-voltage conditions [10][11][12][13][14][15][16][17]. Propagation tests have shown that streamers propagate faster and further in natural ester than in mineral oil under an equivalent applied electric field.…”

Section: Introductionmentioning

confidence: 99%

Molecular Structure and Electronic Properties of Triolein Molecule under an External Electric Field Related to Streamer Initiation and Propagation

Wang

et al. 2017

Energies

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Natural ester has been widely studied as an alternative dielectric liquid to mineral oil in recent years. Unsaturated triacylglycerol molecules are the main components of natural ester; therefore, in this paper, we investigate the molecular structure and electronic properties of the triolein molecule, an oleic-type triacylglycerol molecule, as a representative component of natural ester oils. The effects of external electric fields at the electric field intensity related to streamer initiation and propagation on the bond lengths, dipole moment, total energy, infrared spectra, and orbital energy of the triolein molecule are investigated using density functional theory (DFT). In addition, the excitation energies, transition wavelengths, and oscillator strengths of the first eight excited states of the triolein molecule under external electric fields are calculated by time-dependent DFT. The results show that the bond lengths, dipole moments, total energy, and infrared spectra change obviously under external electric fields. With increasing external electric field intensity, the energy of the highest occupied molecular orbital increases, and the gap between that and the energy of the lowest unoccupied molecular orbital decreases, which make the molecule susceptible to excitation. The calculations contribute to an understanding of the causes behind the degradation of the insulation properties of natural ester oils.

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Lightning Impulse Testing of Natural Ester Fluid Gaps and Insulation Interfaces

Cited by 64 publications

References 13 publications

Optical observation of streamer propagation and breakdown in seed based insulating oil under impulse voltages

Optical observation of streamer propagation and breakdown in seed based insulating oil under impulse voltages

Development of a Biodegradable Electro-Insulating Liquid and Its Subsequent Modification by Nanoparticles

Molecular Structure and Electronic Properties of Triolein Molecule under an External Electric Field Related to Streamer Initiation and Propagation

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