Aging of paper insulation in natural ester dielectric fluid

McShane, C.P.; Rapp, Kevin; Corkran, J.; Gauger, G.A.; Luksich, J.

doi:10.1109/tdc.2001.971319

Cited by 97 publications

(52 citation statements)

References 9 publications

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“…Therefore, the different chemical reaction in oils results in the natural ester having much higher acidity than mineral oil. On the other hand, due to the differences in the chemical structures of acids formed by natural ester and mineral oil, the acids formed in mineral oil are detrimental [15,22,35], while the acids produced by esters are beneficial [22,23,[32][33][34].…”

Section: Moisture Content Of Oil Impregnated Pressboardsmentioning

confidence: 99%

“…Natural ester insulating fluid offers fire safety, environment, and insulation ageing advantages over mineral oil and are found to be suitable for the use in transformer insulation system [7,8]. Previous sealed tube ageing studies show that the thermal ageing rate of virgin paper insulation in natural ester is significantly slower than that in mineral oil [9][10][11]. At present, two typical commercial products of natural ester are BIOTEMP made by ABB in 1999 and FR3 developed by Cooper in 2000.…”

Section: Introductionmentioning

confidence: 99%

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A comparative study of physicochemical, dielectric and thermal properties of pressboard insulation impregnated with natural ester and mineral oil

Liao

Hao

Chen

et al. 2011

IEEE Trans. Dielect. Electr. Insul.

190

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Natural ester is considered to be a substitute of mineral oil in the future. To apply natural ester in large transformers safely, natural ester impregnated solid insulation should be proved to have comparable dielectric strength and thermal stability to mineral oil impregnated solid insulation. This paper mainly focuses on a comparative study of physicochemical, ac breakdown strength and thermal stability behavior of BIOTEMP natural ester/pressboard insulation and Karamay 25# naphthenic mineral oil/pressboard insulation after long term thermal ageing. The physicochemical and dielectric parameters including moisture, acids and the ac breakdown strength of these two oil/pressboard insulation systems at different ageing status were compared. The permittivity and ac breakdown strength of these two oil/pressboard insulation systems at different temperatures were also investigated. And a comparative result of the thermal stability behavior of these two oil/pressboard insulation systems with different ageing status was provided at last. Results show that though natural ester has higher absolute humidity and acidity during the long ageing period, the lower relative humidity of natural ester helps to keep its ac breakdown strength higher than mineral oil. The pressboard aged in natural ester also has higher ac breakdown strength than that aged in mineral oil. The lower relative permittivity ratio of natural ester impregnated paper to natural ester is beneficial to its dielectric strength. Using natural ester in transformer, the resistance to thermal decomposition of the oil/pressboard insulation system could be also effectively improved.Index Terms -Natural ester, mineral oil, pressboard, physicochemical, dielectric strength, thermal stability.

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Section: Moisture Content Of Oil Impregnated Pressboardsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A comparative study of physicochemical, dielectric and thermal properties of pressboard insulation impregnated with natural ester and mineral oil

Liao

Hao

Chen

et al. 2011

IEEE Trans. Dielect. Electr. Insul.

190

View full text Add to dashboard Cite

show abstract

“…Vegetable oil such as natural ester or synthetic ester is among the alternative fluids being considered. For years, various research works were carried out on different aspects such as on the safety / environmental, ageing and electrical performances of the vegetable oil [2][3][4][5][6][7][8][9][10][11][12]. Vegetable oil such as natural ester was also successfully applied in-service where it was used from small to medium transformers up to a voltage level of 66 kV [11].…”

Section: Introductionmentioning

confidence: 99%

“…The high flash and fire points of vegetable oil ensure more in-service operation safety than mineral oil [5]. Moreover, vegetable oil such as natural ester could also slow down the ageing rate of cellulose insulation through water scavenging and hydrolytic protection mechanisms [2][3][4]12].…”

Section: Introductionmentioning

confidence: 99%

Suitability of Palm Based Oil as Dielectric Insulating Fluid in Transformers

Azis¹,

Jasni²,

Kadir³

et al. 2014

Journal of Electrical Engineering and Technology

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-Mineral oil has been widely used as dielectric insulating fluid in transformers due to its excellent performance in-service. However, there are few issues with mineral oil such as it has poor biodegradability and could contaminate the environment if a spillage occurs. With the increasing tight regulation on safety and environment, alternative fluids for mineral oil are currently being investigated and among the suitable candidate is the vegetable oil. There are different types of vegetable oils and one of them is the palm based oil. At the moment, extensive research works are carried out to examine its feasibility to be applied in transformers. This paper will review the previous research works that were carried out to examine the suitability of palm based oil as dielectric insulating fluid in transformers. The physical and chemical properties of palm based oil are studied based on viscosity, acidity, oxidation stability and flash point. Next, the electrical characteristics of palm based oil are examined based on AC breakdown voltage, relative permittivity, dissipation factor and partial discharge.

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“…They are also less flammable liquids with a minimum flash point of about 300°C. Accelerated aging test showed a better performance of the natural ester oil compared to the mineral oil, which enables it to extend the life time of natural ester immersed transformer than the mineral oil ones [1,2].…”

Section: Introductionmentioning

confidence: 99%

A Comparison of Dielectric Properties of Palm Oil with Mineral and Synthetic Types Insulating Liquid under Temperature Variation

Rajab¹,

Sulaeman²,

Sudirham³

et al. 2011

itbj.eng.sci.

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Abstract. Mineral oil is known to have a low biodegradability level and high susceptibility to the fire. These conditions motivate many researchers to look for alternative sources for insulating oil. One of the alternative liquid is palm oil. To verify the suitability of using palm oil as an insulating liquid, it is important to make dielectric properties comparison with the commonly used insulating liquid. This paper presents comparison of temperature effect on dielectric properties of palm oil with mineral type insulating liquid and silicone oil. The measured parameters were breakdown voltage, dissipation factor (tan δ), and dielectric constant. Breakdown voltage measurement was performed in accordance with IEC 156 standard, whereas, the dissipation factor and dielectric constant measurement were conducted based on IEC 60247 standard test methods. The results showed that variations of dielectric properties of palm oil to the temperature change, in general, have the same tendency with those of commonly used insulating liquids i.e. mineral oil and silicone oil. Breakdown voltages and dissipation factors of all tested oils were increased, while their dielectric constants were slightly decreased with the increase of temperature.

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Aging of paper insulation in natural ester dielectric fluid

Cited by 97 publications

References 9 publications

A comparative study of physicochemical, dielectric and thermal properties of pressboard insulation impregnated with natural ester and mineral oil

A comparative study of physicochemical, dielectric and thermal properties of pressboard insulation impregnated with natural ester and mineral oil

Suitability of Palm Based Oil as Dielectric Insulating Fluid in Transformers

A Comparison of Dielectric Properties of Palm Oil with Mineral and Synthetic Types Insulating Liquid under Temperature Variation

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