Understanding the ageing aspects of natural ester based insulation liquid in power transformer

Bandara, Kapila; Ekanayake, Chandima; Saha, Tapan Kumar; Annamalai, Pratheep K.

doi:10.1109/tdei.2015.004744

Cited by 100 publications

(86 citation statements)

References 46 publications

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“…So, the long alkyl chain which is initially part of fatty acids in natural ester binds to cellulose. Further, transesterification process in the insulating paper can be confirmed by C=O functional group at 1743 cm −1 [3]. Figure 9 shows the correlation between intensity of peak absorbance of C-H functional group absorbance (at wavenumber 2922 cm −1 and 2854 cm −1 ) and the average number of chain scissions of transformer insulation paper.…”

Section: The Structural Changes Of Transformer Insulation Papermentioning

confidence: 80%

“…So, the long alkyl chain which is initially part of fatty acids in natural ester binds to cellulose. Further, transesterification process in the insulating paper can be confirmed by C=O functional group at 1743 cm −1 [3]. The predominant chemical reaction in natural esters subjected to high temperature is hydrolysis [30].…”

Section: The Structural Changes Of Transformer Insulation Papermentioning

confidence: 82%

“…The attenuated total reflection (ATR) technique was used to get the infrared spectra. The penetration depth of the light beam into the sample using this mode is about 0.5-3 µm, depending on the ATR material used [3]. Small samples of transformer insulation paper were prepared to conduct this measurement.…”

Section: Fourier Transform Infrared Spectroscopy (Ftir) and Energy DImentioning

confidence: 99%

“…At about 140 °C , the rate of the degradation process increases significantly, implying either a change in the activation energy or in the pre-exponential factor [25]. The DP of paper samples aged at 150 °C was significantly decreased due to thermal stress at high temperature, in which the weak links existing in polymer chains are easily chopped [3,9,26,27]. Figure 3 shows the time dependence of TS under accelerated thermal aging at the temperatures of 120 °C and 150 °C .…”

Section: Degree Of Polymerization (Dp) and Tensile Strength (Ts)mentioning

confidence: 99%

“…The lifetime of a transformer is mainly determined from the degradation of the insulation paper due to thermal-depolymerization and mechanical stress [2]. Heat, moisture and oxygen accelerate the degradation/aging process of transformer insulation paper which is subjected to irreversible degradation [3]. Liquid insulating and solid insulating materials of transformers interact during operation so that their performance can affect each other.…”

Section: Introductionmentioning

confidence: 99%

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Study on the Effects of Thermal Aging on Insulating Paper for High Voltage Transformer Composite with Natural Ester from Palm Oil Using Fourier Transform Infrared Spectroscopy (FTIR) and Energy Dispersive X-ray Spectroscopy (EDS)

Munajad

Subroto

Suwarno³

2017

Energies

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Abstract:Mineral oil is widely used as liquid insulation in high voltage equipment. Due to environmental considerations, recently natural esters have been considered as naturally friendly liquid insulation candidates for high voltage transformers. In this experiment, transformer insulation paper was subjected to get accelerated aging test with copper strip in natural ester in a hermeneutical heat-resistant glass bottle at temperatures of 120 • C and 150 • C for 336 h, 672 h and 1008 h. The experimental results of Fourier transform infrared spectroscopy (FTIR) showed that the intensity of the absorbance peak of the O-H functional group decreased with aging, while the intensity of the C-H and C=O functional group absorbance peaks have increased with aging and the intensity of the C-O functional group absorbance peak has a tendency to increase with aging. The energy dispersive X-ray spectroscopy (EDS) experimental results showed that the weight percent of the element C increased with aging and the weight percent of the element O has decreased with aging. The experimental results show a good correlation between the degree of polymerization (DP) and the weight percent of O element. This indicates that EDS may be used as a new method for estimating the DP of transformer insulation paper.

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Section: The Structural Changes Of Transformer Insulation Papermentioning

confidence: 80%

“…So, the long alkyl chain which is initially part of fatty acids in natural ester binds to cellulose. Further, transesterification process in the insulating paper can be confirmed by C=O functional group at 1743 cm −1 [3]. The predominant chemical reaction in natural esters subjected to high temperature is hydrolysis [30].…”

Section: The Structural Changes Of Transformer Insulation Papermentioning

confidence: 82%

Section: Fourier Transform Infrared Spectroscopy (Ftir) and Energy DImentioning

confidence: 99%