Preliminary results for dissolved gas levels in a vegetable oil-filled power transformer

Martín, D.; Lelekakis, N.; Davydov, Valery; Odarenko, Yuriy

doi:10.1109/mei.2010.5585007

Cited by 34 publications

(12 citation statements)

References 6 publications

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“…The levels of oxygen, shown in Fig. 10, are low and are similar to the levels found in the operating natural ester transformer described previously by the authors in [23].…”

Section: Consequence Of Difference In Temperaturesupporting

confidence: 86%

Using a remote system to study the thermal properties of a vegetable oil filled power transformer: How does operation differ from mineral oil

Martín

Guo

Lelekakis

et al. 2011

2011 IEEE PES Innovative Smart Grid Technologies

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There has been much discussion on the properties of natural esters and how they can be best applied as a transformer dielectric. The thermal properties of natural esters are different from those of mineral oil. A difficulty with investigating the thermal properties is that it is uncommon to find the same transformer design filled with different fluids.Two 90MVA power transformers were manufactured to the same design and installed in the south east of England, UK, where they were connected to the internet via a private connection. The transformers have been filled with different dielectrics, one being mineral oil and the other a natural ester. Remote monitoring has allowed us to perform a field study on the thermal properties of a natural ester and their effect on the operation of the transformer. The investigation shows that despite the viscosity affecting the cooling capability a power transformer can be designed so that there is little effect on its temperature. This study also demonstrates the advantage of remote monitoring, where a team in Australia can oversee a transformer on the other side of the world.

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“…The levels of oxygen, shown in Fig. 10, are low and are similar to the levels found in the operating natural ester transformer described previously by the authors in [23].…”

Section: Consequence Of Difference In Temperaturesupporting

confidence: 86%

Using a remote system to study the thermal properties of a vegetable oil filled power transformer: How does operation differ from mineral oil

Martín

Guo

Lelekakis

et al. 2011

2011 IEEE PES Innovative Smart Grid Technologies

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“…However, this biodegradable oil produced higher amount of hydrogen gas compared to mineral oil when tested without the pressboard [10]. The similar DGA results also were found in the same type of biodegradable oil which was filled in a 132 kV, 50 MVA power transformer [1,4]. Table 2 shows the classification according to Duval analysis of the ester oils and mineral oil.…”

Section: B Dga Resultssupporting

confidence: 63%

“…Recent reports have appeared on the development and practical use of environmentally friendly insulating oil for aiming at the construction of circular type society [1][2][3][4]. Among them, ester family insulating oils (ester oil) have good biodegradability and safety owing to high burning point compared with mineral oil [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Comparative study of partial discharge characteristics and dissolved gas analysis on palm-based oil as insulating material

Susilo

Muslim

Hikita

et al. 2014

The 2nd IEEE Conference on Power Engineering and Renewable Energy (ICPERE) 2014

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Partial discharge (PD) properties and dissolved gas analysis (DGA) are investigated on two kinds of fatty acid alkyl esters synthesized from palm oil with additive, namely Pastell 2H-08 and Palm Fatty Acid Ester (PFAE) to be adopted in power transformers. For comparison, the properties of mineral oil which is commercially used transformer oil were also investigated in the research works. The results revealed that PD repetition rate number of the ester oils with additive increase remarkably at above 15 kV rms of voltage application than that of mineral oil. PD charge of ester oils with additive tends to saturate at about 10,000 pC, while PD charge of mineral oil seems to keep increasing with increasing the applied voltage at above 20 kV rms . The amounts of generated hydrocarbon gases in ester oils with the additive are higher than that of mineral oil. It is found that combustible gas pattern of the ester oils with the additive are different from that of conventional mineral oil. Duval analysis of ester oils with additive and mineral oil are classified as high energy electrical discharge, while for mineral oil is classified as low energy electrical discharge.

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“…In natural ester at relatively low temperatures in the range of 80 °C to 250 °C a substantial development of stray gases like ethane and hydrogen is observed for a period of time (weeks to months) after transformer is energized [29]. It is also observed that susceptibility towards stray gas generation varies from batch to batch of FR3 [38]. Natural esters have higher gas generation on account of PD (hydrogen with traces of acetylene) compared to mineral oil at the same voltage level [40].…”

Section: Dissolved Gas Analysis (Dga) and Stray Gassingmentioning

confidence: 99%

A review on critical evaluation of natural ester vis-a-vis mineral oil insulating liquid for use in transformers: Part 1

Mehta

Kundu

Chowdhury

et al. 2016

IEEE Trans. Dielect. Electr. Insul.

157

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In a long 130 years of its journey in service to mankind, the power transformer has grown in many aspects; ratings, performance, technology, aesthetics and ecofriendliness. Today, the transformer industry is witnessing the era of shifting from petroleum based mineral oils that are depleting, environmentally unfavorable, and proven dangerous to natural esters (vegetable oil based) that are renewable, environmentally friendly, and non-hazardous. The market and regulatory pressures to reduce liability risk exposure of mineral-oil-filled distribution and power transformers are increasing. In addition, there are demands to improve equipment efficiency and adopt more "earth-friendly" options in our power systems. In the last two decades there has been a resurgence of usage of natural ester insulating liquids for their "GREEN" and Safety credentials. These renewable resources have good dielectric properties and are compatible for use in power transformers. This paper evaluates and relates the new natural ester oil with existing mineral oil technology in terms of environmental concern, fire safety, physio-chemical properties, thermal performance, and dielectric performance. It also covers key modifications in design, manufacturing and operation to help assure excellent functionality and long life. In brief, this paper provides transformer designers and users about the advantages and challenges of "Green Insulating Liquid". Due to the voluminous properties that are compared and discussed, this paper is presented in two parts: Part 1 discusses on key properties and standards for the two liquids. Part 2 emphasizes on additional key properties and material compatibility related to electrical design. Based on evidence discussed in both parts, it is concluded that natural esters are acceptable for both new transformers and for retro filling existing units.

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Preliminary results for dissolved gas levels in a vegetable oil-filled power transformer

Cited by 34 publications

References 6 publications

Using a remote system to study the thermal properties of a vegetable oil filled power transformer: How does operation differ from mineral oil

Using a remote system to study the thermal properties of a vegetable oil filled power transformer: How does operation differ from mineral oil

Comparative study of partial discharge characteristics and dissolved gas analysis on palm-based oil as insulating material

A review on critical evaluation of natural ester vis-a-vis mineral oil insulating liquid for use in transformers: Part 1

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