Comparative aging characteristics between a high oleic natural ester dielectric liquid and mineral oil

Singha, Santanu; Asano, Roberto; Frimpong, G.; Claiborne, C.C.; Cherry, Donald S.

doi:10.1109/tdei.2013.003713

Cited by 38 publications

(43 citation statements)

References 10 publications

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“…Also, the thermal up-gradation process was widened the operating temperatures of the paper from 95 0 C to 110 0 C, suggested by IEEE C57.91 [10]. Similarly, further improvements in operating temperatures of transformer insulating paper have been achieved by using synthetic materials [11,12]. These synthetic papers and films can operate even at higher temperatures (> 220 0 C and higher) [11].…”

Section: Introductionmentioning

confidence: 99%

“…Within the Nomex family of products, primarily Nomex 910 and Nomex 410 papers are the high quality insulating materials to address virtually any electrical insulation requirement. Nomex 910 has a unique three-ply construction [12,13]. The two plies on the outside of the sheet are a combination of cellulose and synthetic aramid.…”

Section: Introductionmentioning

confidence: 99%

“…However, the above discussed aging models established that the dielectric characteristics are satisfactory for new materials, and decline with time and temperature variations. Thus, the insulating materials having higher operating temperatures need to have longer service life time with better thermal characteristics [11,12]. However, there is still a need to do much detailed thermal and electro-thermal aging studies of the new solid dielectric materials.…”

Section: Introductionmentioning

confidence: 99%

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Performance Analysis of Cellulose and Nomex - 910 Impregnated Oil Filled Power Transformers

Ranga¹,

Chandel²,

Chandel³

2017

ijeei

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In the present paper, the influence of accelerated thermal aging on thermally upgraded Kraft and Nomex 910 insulated power transformers has been determined. The present experimental study also determines the effectiveness of 2, 6-dibutyl-4-methylphenol oxidative inhibitor on the degradation rate of mineral transformer oil with alternative solid dielectrics. From the accelerated aging studies, it has been revealed that Nomex impregnated oil samples have shown around 15% improved thermal characteristics over thermally upgraded Kraft oil samples. Also these samples have exhibited 20% enhanced oxidation stability even at temperatures more than 200 0 C. Therefore, Nomex insulating materials have been recommended as solid dielectrics for power transformers in order to achieve better operating characteristics and improved oxidation stability.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance Analysis of Cellulose and Nomex - 910 Impregnated Oil Filled Power Transformers

Ranga¹,

Chandel²,

Chandel³

2017

ijeei

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“…This will, in turn, cause and accelerate the deterioration of the insulation, posing a potential threat to the equipment safety. Aging is a phenomenon resulting in slow and irreversible changes in material properties [3][4][5][6]. The process implies the decomposition of vulnerable hydrocarbons resulting in a modification of the macromolecular structure of the liquid and solid materials.…”

Section: Introductionmentioning

confidence: 99%

“…The process implies the decomposition of vulnerable hydrocarbons resulting in a modification of the macromolecular structure of the liquid and solid materials. In general, transformer oil loses its stability gradually and becomes decomposed and oxidized [3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Measurement of the Relative Free Radical Content of Insulating Oils of Petroleum Origin

Fofana

Sabau²,

Bétié

2015

Energies

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Oil/paper insulation degradation in transformers involves chemical and physical changes in the materials. Some of the chemical reactions involve very reactive intermediates called free radicals. Free radicals play a major role in a wide variety of ageing processes. The detection of these reactive species in oil may, in principle, provide useful information for monitoring oil degradation. This manuscript details a laboratory technique, which determines the relative content of free radicals in insulating oils of petroleum origin by a spectrophotometric method. Free radicals may be formed in oils under operating or test conditions. The procedure enables the determination of the relative concentration of free radicals, which can act as the precursors of decay products such as charge carriers, oxidized molecules, as well as polymerization products. The technique involves using a reactive free radical reagent, 2,2-diphenyl-1-picrylhydrazyl (DPPH), added to oil to assess free radical concentration. This method is applicable to new, reclaimed, or used oils as well as naturally or artificially oxidized oil (the cause of aging can be chemical, physical, or electrical). In this contribution, free radicals were assessed following electrical discharge application in oil.

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Biodegradable Oils and their Impact on Paper Ageing

Saha¹,

Purkait²

2017

Transformer Ageing

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Comparative aging characteristics between a high oleic natural ester dielectric liquid and mineral oil

Cited by 38 publications

References 10 publications

Performance Analysis of Cellulose and Nomex - 910 Impregnated Oil Filled Power Transformers

Performance Analysis of Cellulose and Nomex - 910 Impregnated Oil Filled Power Transformers

Measurement of the Relative Free Radical Content of Insulating Oils of Petroleum Origin

Biodegradable Oils and their Impact on Paper Ageing

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