Thermal life evaluation of high temperature insulation systems and hybrid insulation systems in mineral oil

McNutt, W. J.; Provost, R. L.; Whearty, R.J.

doi:10.1109/61.517497

Cited by 30 publications

(12 citation statements)

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“…In recent years considerable interest has been placed on the usage of environmental friendly biodegradable oils in the power industry in order to reduce its overall impact on the environment [3][4][5]. However, due to its widespread use, early laboratory studies focused on the aging behavior of mineral oil [6][7][8][9][10][11][12][13][14] and various physical, chemical and dielectric changes were reported following aging. Physical markers of aging include yellowing [6,7], precipitate formation [7,8] and changes in oil viscosity [9].…”

Section: Introductionmentioning

confidence: 99%

“…However, due to its widespread use, early laboratory studies focused on the aging behavior of mineral oil [6][7][8][9][10][11][12][13][14] and various physical, chemical and dielectric changes were reported following aging. Physical markers of aging include yellowing [6,7], precipitate formation [7,8] and changes in oil viscosity [9]. Chemical markers include oxidation [7,10,11], increased acidity [7,8,9,12,13], increased water content [7,12,13] and production of gases and chemical byproducts [10,14].…”

Section: Introductionmentioning

confidence: 99%

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Effect of aging on the physical, chemical and dielectric properties of dodecylbenzene

Hosier

Koilraj

Vaughan

2016

IEEE Trans. Dielect. Electr. Insul.

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High voltage transformers and cables form integral parts of the electrical power distribution network and therefore their reliable operation is crucial to preventing costly outages. A liquid dielectric, typically mineral oil, is used in transformers whilst dodecylbenzene is gradually replacing mineral oil in paper/oil cable systems. As such, the oil serves as a convenient medium for sampling to assess plant health. In the current investigation, samples of dodecylbenzene cable oil were aged at 135 ºC under conditions where the oxygen diffusion into the oil was deliberately limited. The resulting aged samples were subjected to a battery of tests to determine changes in their physical, chemical and dielectric properties. Aging resulted in yellowing, oxidation, increased water content, increased dielectric loss, increased electrical conductivity and reduced electrical breakdown strength. Copper accelerated the aging process resulting in the formation of an insoluble precipitate; however, the inclusion of this material did not affect the electrical properties of the oil indicating that it is non-polar in nature. Instead, the deterioration of the dielectric properties was found to be correlated with the production of small polar molecular compounds, which remain dissolved within the oil, such as water, alcohols, ketones, carboxylic acids and aldehydes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of aging on the physical, chemical and dielectric properties of dodecylbenzene

Hosier

Koilraj

Vaughan

2016

IEEE Trans. Dielect. Electr. Insul.

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“…mobile transformers, traction transformers, etc.) which can justify the higher cost of the high temperature material (McNutt, 1996).…”

Section: B Dual Temperature Aging Modelmentioning

confidence: 99%

“…This model was used to derive test data on a cellulose/ mineral oil system, a Nomex/mineral oil system and on a hybrid Nomex/cellulose/mineral oil system. The conductors were insulated with 4 layers of 3 mil Kraft or 6 layers of 2 mil Nomex, wound in half-laps for a total two-side build of 48 mils (McNutt, 1996).…”

Section: B Dual Temperature Aging Modelmentioning

confidence: 99%

Review of Different Prorated Models Which Detects the Effect of Accelerated Stresses on Power Transformer Insulation

Singh¹,

Sood²,

Verma³

2010

IJCEE

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Abstract--Transformer protection and safety is based on large number of tests. On the basis of these test results, vital decision on transformer diagnostic and condition monitoring is done. But some times it is not possible to conduct the tests on transformer in service because it may destructive in nature so, in order to perform these tests, scaled-down or prorated models of actual power transformers are used in experimental study. In this paper, different prorated models with their aging cycles have been studied.

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“…Many papers have been already focused on study of such combined insulation system of transformer [1]- [3]. As generally known, liquid component of electrical insulation expressively influences final properties of the whole insulation system.…”

Section: Introductionmentioning

confidence: 99%

Synthetic ester-based oils and their application in power industry

Mentlík¹,

Polanský²,

Prosr³

et al. 2009

REPQJ

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Abstract. Suitable (biodegradable) substitution of classic mineral petroleum-based oils used in power transformers is studied. Paper presents test results of six paper-oil insulation systems varying by different type of oil. Three common transformer oils and three new synthetic oils (never used in power transformers before) were selected for the purpose of experiment. The oils have been exposed to accelerated thermal aging (at the temperature of 90 °C) and their properties were measured in time intervals of 0, 50, 125, 225, 500, 1000 and 2000 hours.

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Thermal life evaluation of high temperature insulation systems and hybrid insulation systems in mineral oil

Cited by 30 publications

References 0 publications

Effect of aging on the physical, chemical and dielectric properties of dodecylbenzene

Effect of aging on the physical, chemical and dielectric properties of dodecylbenzene

Review of Different Prorated Models Which Detects the Effect of Accelerated Stresses on Power Transformer Insulation

Synthetic ester-based oils and their application in power industry

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