State of Dissolved Water in Insulating Oil under Electric Field

Itahashi, S.; Mitsui, H.; Sone, M.

doi:10.1541/ieejfms1990.115.9_896

Cited by 5 publications

(3 citation statements)

References 2 publications

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“…But accurate control was difficult in these experiments because the amount of water involved was less than 100 ppm [6,7] and because the amount of water in the liquid at saturation was quite small [9][10][11][12]. Thus, a water-saturated ketone compound was added to the saturated hydrocarbon.…”

Section: Sample Selection and Control Of Water Contentmentioning

confidence: 99%

“…The bound water was a cause of increasing conductivity. The behavior of bound water in an electric field was also analyzed by FT-IR, and it was found that water molecules did not separate from DOP (dioctyl phthalate) but promoted conduction at fields of up to 100 kV/cm [6]. Iwasawa's group also investigated the conduction of bound water in some polar compounds and found that the stronger the hydrogen bonds, the more readily the conductivity increased [7].…”

Section: Introductionmentioning

confidence: 99%

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Conduction of water clusters in modified aged oil

Ota

Miura

Sone

et al. 2003

Electrical Engineering Japan

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SUMMARYDissolved water in insulating liquids has been regarded as a kind of impurity that degrades electrical properties. Recently, the state and the behavior of water molecules in liquid have been measured by infrared methods, making it possible to analyze where water molecules are bound to dielectric molecules and how many molecules gather around polar radicals on the alkyl chain.In the case of transformer oil, which consists almost entirely of saturated hydrocarbons, the content of oxidation products is gradually increased by aging during use. These oxidation products include polar radicals such as carbonyl and ketone radicals. When water dissolves in such oil, water molecules interact with these polar radicals to form water clusters, which can make the conductivity increase. In the research reported here, partially oxidized hydrocarbon was mixed with saturated hydrocarbon and the effect of water clusters around ketone radicals on the conductivity was investigated. When the content of oxidation products was less than 10%, the conductivity did not increase with an increase in the amount of water. But when the ratio exceeded 10%, specific kinds of water clusters increased the conductivity. It appears that these clusters consist of water molecules gathered around one ketone radical.

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Section: Sample Selection and Control Of Water Contentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Conduction of water clusters in modified aged oil

Ota

Miura

Sone

et al. 2003

Electrical Engineering Japan

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“…As a result, the problems such as streaming electrification caused by electrostatic charge accumulation [2], increasing of water quantity [3] in the oil and viscosity occur, the risk becomes high. It is important to understand these problems and chemical phenomena.…”

Section: Introductionmentioning

confidence: 99%

Transmittance spectra of oxidized insulation oil using terahertz spectroscopy

Nishimura

Ogura

Matsumoto

et al. 2011

2011 IEEE International Conference on Dielectric Liquids

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The number of aged power equipment increases and it is important to clarify the characteristics of deteriorated insulating oil. This paper describes the basic study on transmittance spectra of oxidized insulating oils by terahertz spectroscopy. First, the mineral and mixture insulating oils heated in oxygen were measured and observed spectra change. Second, the oxidation process of insulating oil was modeled by using various compositions of dodecane and 2-octanol. The absorption related to hydroxyl groups (-OH) was significantly observed between 6 and 7 THz. And hydrogen bonds were observed from vibration change of OH. The absorption band was also observed in accelerated aging insulating oils used in power equipments as insulating oil.

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Effect of Hydrophobic Groups on the Conduction of Water Cluster

2003

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Dissolved water in insulating liquid had been regarded as a kind of impurities that deteriorate electrical properties. Recently, the state and the behavior of water molecules in liquid were measured by IR method. And it had been analyzed where water molecules bond around dielectric molecule and how many molecules gather around polar base among the alkyl chain.The transformer oil consists of saturated hydrocarbons that are composed of the various length of alkyl chain. So in the case that hydrocarbon molecules include the polar base such as carbonyl group and ketonic group because of aging and oxidizing, it should be cared that water cluster interact with not only polar groups but also hydrophobic groups. In this paper, water was dissolved in ketonic compound with various length of alkyl chain. The effects of hydrophobic groups on the ratio of water clusters and on the conduction of water cluster were discussed. As a result, when the alkyl chain of ketonic compound become long, the ratio of small water clusters such as dimer and trimmer decreased. And the result from the relationship between the ratio of water clusters and the conductivity, it was appeared that the small water cluster contribute to increase of conductivity.キーワード：水クラスタ，疎水基，導電率，IR スペクトル

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State of Dissolved Water in Insulating Oil under Electric Field

Cited by 5 publications

References 2 publications

Conduction of water clusters in modified aged oil

Conduction of water clusters in modified aged oil

Transmittance spectra of oxidized insulation oil using terahertz spectroscopy

Effect of Hydrophobic Groups on the Conduction of Water Cluster

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