DGA and tensile strength test on accelerated thermal aging of ester oil and kraft paper

Widyanugraha, Taufik; Rachmad, Rizal; Wendhy,; Suwarno, &

doi:10.1109/iceei.2015.7352491

Cited by 9 publications

(9 citation statements)

References 3 publications

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“…The transformer insulation paper was wrapped around the copper metal strip. Firstly, the natural ester samples in the glass bottles were heated without sealing at a temperature of 100 • C for 24 h in order to ensure the same initial conditions [1,15,16]. Then the transformer insulation paper and copper metal strip were put into heat-resistant and sealed glass bottles.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…This analysis can be also utilised to describe the paper ageing through CO and CO 2 dissolved in the oil. Different works have showed that there is a relationship between the concentration of these gases and the DP (CO 2 /CO ≤ 7.4, DP > 600; 7.4 < CO 2 /CO < 8.0, 400 < DP < 600; 8 ≤ CO 2 /CO < 8.7, 250 < DP < 400; CO 2 /CO ≥ 8.7, DP < 250) [34,35]. The gases, which can be extracted from the oil using different methods [18], are detected using the gas chromatography technique whose operating principle is like HPLC.…”

Section: Dissolved Gas Analysismentioning

confidence: 99%

“…They found a slight variation of the tensile index in the three oils. The degradation of Kraft paper aged in a natural ester was also evaluated through the tensile strength by Widyanugraha et al [35], who also measured the gases generated during ageing at two different temperatures. The tensile strength suffered initially a decrease and subsequently an increase during thermal ageing.…”

Section: Accelerated Thermal Ageing In Laboratorymentioning

confidence: 99%

Assessment of Dielectric Paper Degradation through Mechanical Characterisation

Fernández-Diego¹,

Fernández²,

Fernández³

et al. 2018

Simulation and Modelling of Electrical Insulation Weaknesses in Electrical Equipment

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Power transformers life is limited fundamentally by the insulation paper state, which can be analysed through different techniques such as furanic compound concentration, dissolved gases, methanol concentration, Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscope, refractive index of cellulose fibres, degree of polymerisation or tensile strength. The two last techniques provide the best way to evaluate mechanical resistance of insulation paper. This chapter describes briefly the most remarkable studies about post-mortem assessment and thermal ageing tests in which mechanical properties are some of the characteristics evaluated to determine paper degradation. This work also gathers the main relationships developed until now to relate different by-products generated during transformer operation with loss of paper mechanical properties. Finally, this chapter defines the future approaches, which could be used to study paper degradation.

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“…Additionally, these authors measured dissolved gas in dielectric oil. The failure rate of transformer insulation systems made up of Kraft paper and mineral oil and two different vegetal oils was evaluated by Madavan and Balaraman [23]. They aged the insulation systems at 140ºC and tested dielectric strength, acidity, dissipation factor, resistivity and tensile strength.…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, several authors have modeled the relationship between the variation of the tensile strength and the degree of polymerisation (DP) over time [25][26]. Another more recent studies [21,[27][28][29][30] have correlated the variation of the tensile strength with properties of the oil such as: dissolved gases, furans content [28], breakdown voltage, acidity and water content [27,31].…”

Section: Introductionmentioning

confidence: 99%

Assessment of the effect of commercial vegetal oils on Kraft paper ageing through mechanical characterization

Fernández-Diego

Ortiz

Fernández

et al. 2018

IEEE Trans. Dielect. Electr. Insul.

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Vegetal oils are considered a suitable substitute of mineral oil, widely used in power transformers as insulation liquid and cooling. Due to the fact that more and more power transformers containing this alternative insulating fluids are being constructed it is needed the development of mathematical aging models which help to predict transformer failures. The continued performance of power transformers depends on the condition of its paper insulation mainly. In this sense, this paper analyses Kraft paper degradation through the loss of its mechanical strength. Accelerated thermal ageing test of the paper in two different vegetal oils were carried out at three temperatures during diverse periods of time, in order to obtain information on the kinetics of the ageing degradation of the paper. The evolution of the mechanical properties of paper failure are analysed as a function of temperature and ageing time. Finally, the results obtained are compared with the traditional method of degradation analysis, based on the degree of polymerisation (DP) measurement.

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DGA and tensile strength test on accelerated thermal aging of ester oil and kraft paper

Cited by 9 publications

References 3 publications

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)

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)

Assessment of Dielectric Paper Degradation through Mechanical Characterisation

Assessment of the effect of commercial vegetal oils on Kraft paper ageing through mechanical characterization

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