Comparison of mineral oil and esters as cooling liquids in high voltage transformer in aspect of environment protection

Dombek, Grzegorz; Gościński, Przemysław; Nadolny, Zbigniew

doi:10.1051/e3sconf/20171401053

Cited by 12 publications

(7 citation statements)

References 14 publications

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“…The next discussed point is the higher viscosity of natural ester oil in comparison with mineral oil. This may cause an increase of temperature in the whole transformer [42]. This is solved by changing the cooling circuit design, which would lead to a reduction of the oil temperature [43].…”

Section: Discussionmentioning

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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Section: Discussionmentioning

confidence: 99%

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

et al. 2018

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“…On the other hand, their pour point is satisfactory, they are classified as low flammability liquids, their breakdown voltages tend to be much higher than those of mineral and silicone oils even with substantial amounts of moisture, and, last but not least, the operating temperatures of vegetable oils are clearly higher than those of mineral oils. The latter point of [46] is contested in [47], where it was claimed that in the case of power transformers (e.g. 160MVA) temperature increase in transformers filled with esters can be even greater as compared to the temperature of the transformer filled with mineral oil.…”

Section: Possible Alternatives To Transformer Oimentioning

confidence: 99%

“…160MVA) temperature increase in transformers filled with esters can be even greater as compared to the temperature of the transformer filled with mineral oil. Therefore, according to [47], in order to use synthetic or natural ester, the changing of the geometry of the transformer (increasing its size), the reduction of the load, or the modification of the cooling system should be considered.…”

Section: Possible Alternatives To Transformer Oimentioning

confidence: 99%

Alternative Fluids – with a Particular Emphasis on Vegetable Oils – as Replacements of Transformer Oil: A Concise Review

Danikas

Sarathi

2020

Eng. Technol. Appl. Sci. Res.

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For many decades transformer oil has served as a well-known insulating medium. Its electrical properties, among others, have been studied in length. In recent years, with the increasing concern for the environment, alternative insulating liquids have been proposed. In the context of this concise review, such alternative fluids are investigated. Some conflicting evidence regarding experimental results that still persist are discussed and aspects of vegetable oils in need of further work are pointed out.

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“…Before PO is used in industry, it is necessary to test its suitability for transformer application in terms of physical, chemical, electrical properties and others [23]. Several reviews and semi-review papers on the relevancy of VO as an insulating oil have been published in the recent past [24]- [33]. Furthermore, a review on the addition of nanoparticles onto PO also has been discussed widely and comprehensively [34]- [38].…”

Section: Introductionmentioning

confidence: 99%

A Review on Palm Oil-Based Nanofluids as a Future Resource for Green Transformer Insulation System

et al. 2022

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Alternative transformer oil has been investigated universally in past years. Different types of vegetable oil have been proposed and evaluated as replacements for conventional transformer oil (mineral oil) due to increasing exploitation and depleting petroleum reserves. In response to growing concern about global environmental and sustainable issues, this article discusses the suitability of palm oil (PO) and palm oil-based nanofluids (PO-N) as alternative transformer oils. A brief discussion of environmental concerns is provided in this paper, and the detailed properties of PO are thoroughly addressed. The electrical performance (alternating current breakdown voltage and lightning impulse breakdown voltage), physical behaviour (viscosity, flash point, and fire point), tan delta, and relative permittivity of PO and PO-N are also discussed in this paper. Based on reliable data and research, it has been proven that refined, bleached, deodorised palm oil (RBDPO) has been determined to be the most promising type of PO when compared to others. Furthermore, when CuO nanoparticles are added to RBDPO with the use of CTAB surfactant, the AC breakdown voltage increases by 173.42 % compared to RBDPO without CuO. However, there is still scope for further improvement in nanofluid stability. In addition to these studies, future research should focus on other aspects such as ageing studies, partial discharge breakdown voltage, etc. PO has interesting properties that make the industry and scientific community take notice.

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Comparison of mineral oil and esters as cooling liquids in high voltage transformer in aspect of environment protection

Cited by 12 publications

References 14 publications

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

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

Alternative Fluids – with a Particular Emphasis on Vegetable Oils – as Replacements of Transformer Oil: A Concise Review

A Review on Palm Oil-Based Nanofluids as a Future Resource for Green Transformer Insulation System

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