Comparative study on power transformers vegetable and mineral oil ageing

Ciuriuc, Alexandra; Vihacencu, Mirela; Dumitran, Laurentiu Marius; Notingher, P.

doi:10.1109/icate.2012.6403401

Cited by 24 publications

(12 citation statements)

References 11 publications

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“…The test results showed that the use of vegetable oil improved the performance of transformers, prolonged useful life, lowered rates of failure.Jung-II Jeong et al [52] thermally aged transformer filled with vegetable oil and mineral oil and concluded results that vegetable oil have better insulation characteristics as compared to the mineral oil. Alexandra Ciuriuc et al [53] presented comparative study related to the ageing of vegetable and mineral oils used in power transformers. The samples of vegetable and mineral oil were accelerated thermally aged and their dielectric properties (real part of complex permittivity, dissipation factor and resistivity) were found at different ageing times.…”

Section: Historic Evolution Of Vegetable Oil As Transformer Oilmentioning

confidence: 99%

Use of vegetable oils as transformer oils – a review

Rafiq

Zhou

et al. 2015

Renewable and Sustainable Energy Reviews

247

102

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Section: Historic Evolution Of Vegetable Oil As Transformer Oilmentioning

confidence: 99%

Use of vegetable oils as transformer oils – a review

Rafiq

Zhou

et al. 2015

Renewable and Sustainable Energy Reviews

247

102

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“…As shown in these figures, it is clear that the peak absorbance value of the O-H functional group located close to 3329 cm −1 decreases with aging due to the oxidation process. The products of degradation of cellulose paper are CO, CO2, H2O, H2, CH4, and furans, which are dissolved in the mineral oil [28]. During thermal aging, the cleavage of cellulose chains involves an O-H functional group.…”

Section: Fourier Transform Infrared (Ftir) Spectroscopy Analysis Of Tmentioning

confidence: 99%

Fourier Transform Infrared (FTIR) Spectroscopy Analysis of Transformer Paper in Mineral Oil-Paper Composite Insulation under Accelerated Thermal Aging

2018

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Abstract:Mineral oil is the most popular insulating liquid for high voltage transformers due to its function as a cooling liquid and an electrical insulator. Kraft paper has been widely used as transformer solid insulation for a long time already. The degradation process of transformer paper due to thermal aging in mineral oil can change the physical and chemical structure of the cellulose paper. Fourier transform infrared (FTIR) spectroscopy analysis was used to identify changes in the chemical structure of transformer paper aged in mineral oil. FTIR results show that the intensity of the peak absorbance of the O-H functional group decreased with aging but the intensity of the peak absorbance of the C-H and C=O functional groups increased with aging. Changes in the chemical structure of the cellulose paper during thermal aging in mineral oil can be analyzed by an oxidation process of the cellulose paper and the reaction process between the carboxylic acids in the mineral oil and the hydroxyl groups on the cellulose. The correlation between the functional groups and the average number of chain scissions of transformer paper gives initial information that the transformer paper performance can be identified by using a spectroscopic technique as a non-destructive diagnostic technique.

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“…Because IMO is derived from petroleum, a non-renewable resource, new alternatives for insulating fluids for the electrical sector have been sought. Insulating natural esters (INEs) show faster biodegradability than IMO and are derived from renewable resources; thus, INEs are strong candidates for replacing IMO [3] . Solid insulation is performed by insulating paper based on 90% cellulose coupled with hemicellulose, lignin and traces of pentose; this insulating paper is fundamentally important because it cannot be replaced while a transformer is in service, and thus, the paper determines the useful lifetime of the equipment [4] .…”

Section: Introductionmentioning

confidence: 99%

Correlation between stabilizer consumption and degree of polymerization of thermally upgraded paper aged in insulating natural ester and insulating mineral oil

et al. 2016

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SbstractInsulating paper holds significant importance in the insulation system of power transformers, and thus, its degradation is the subject of many studies. A successful evaluation of the degradation rate of such paper contributes to reducing downtime and avoiding equipment failure. In this work, samples of thermally upgraded paper were thermally aged in insulating natural ester (INE) and insulating mineral oil (IMO) and were evaluated by degree of polymerization (DP) and FTIR-ATR. It was possible to identify characteristic bands of dicyandiamide, an inhibitory compound of the thermal degradation of the paper, and to establish a correlation between the decrease in DP and the consumption of dicyandiamide during aging, which was observed to develop in three distinct steps for both IMO and INE.

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Comparative study on power transformers vegetable and mineral oil ageing

Cited by 24 publications

References 11 publications

Use of vegetable oils as transformer oils – a review

Use of vegetable oils as transformer oils – a review

Fourier Transform Infrared (FTIR) Spectroscopy Analysis of Transformer Paper in Mineral Oil-Paper Composite Insulation under Accelerated Thermal Aging

Correlation between stabilizer consumption and degree of polymerization of thermally upgraded paper aged in insulating natural ester and insulating mineral oil

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