Study on moisture influence on electrical conductivity of natural ester fluid and mineral oil

Vahidi, F.; Haegele, S.; Tenbohlen, Stefan; Rapp, Kevin; Sbravati, Alan

doi:10.1109/eic.2017.8004614

Cited by 9 publications

(7 citation statements)

References 2 publications

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“…Katiyar et al [37] developed moisture in anatase and rutile TiO 2 nano oils by leaving it idle in the atmosphere for different time periods, to study its humidity ageing. Vahidi et al [59] studied the humidity ageing of MO for different levels of relative humidity (RH) in the chamber and clearly verified the rapid water absorption occurs at the higher intensity of RH. So, in this study, the humidity ageing of the proposed TTNF blend is done at the maximum level of RH (i.e.…”

Section: Experimental Studiesmentioning

confidence: 99%

Titania‐based transformer nanofluid: a study on the synthesis for enhanced breakdown strength and its humidity ageing

Raja¹,

Koperundevi²

2020

IET Nanodielectrics

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Section: Experimental Studiesmentioning

confidence: 99%

Titania‐based transformer nanofluid: a study on the synthesis for enhanced breakdown strength and its humidity ageing

Raja¹,

Koperundevi²

2020

IET Nanodielectrics

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“…Furthermore, the results of [21] suggest that the water in clusters occurs in Midel ® 7131, which means that the water molecules have contact with each other. Consequently, the electrolytic dissociation in the dissolved water also plays a role and leads to an increase in conductivity when compared to mineral oil, which has lower absolute water content by one to two orders of magnitude [22,23]. In the water clusters the electrolytic dissociation is much more pronounced than in the insulating oil, because water with a permittivity of 81 is much more polar.…”

Section: Pure Oil Gapmentioning

confidence: 99%

Oil Impregnated Pressboard Barrier Systems Based on Ester Fluids for an Application in HVDC Insulation Systems

Rumpelt

Jenau

2017

Energies

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Abstract:Ester-based insulation fluids are being increasingly used in high-voltage insulation systems. The reasons are the advantages in the area of ecological compatibility and resource-saving provision. The intention to use ester-based insulation fluids in high voltage direct current (HVDC) equipment is new. The major challenge in designing the HVDC insulation system is, that the systems do not only experience an alternating voltage, but also a direct voltage Offset. This presents a challenge to predict the electric field distribution. For this purpose, basic investigations are carried out in the form of conductivity investigations for various insulation barrier systems. In addition, a mineral oil serves as a reference oil for estimating existing insights. The results show the influence of the ester-based insulating liquids on the direct current (DC) conductivity for basic arrangements, consisting of pressboard barriers and mixed insulations.

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“…Previous studies on the conductivity characteristics of oil-pressboard insulation have mainly centered on transformer oil. For example, Vahidi studied the influence of moisture on the electrical conductivity of natural ester and mineral oil and found that the conductivity of natural ester was two orders of magnitude higher than that of mineral oil [9]. Abedian investigated the temperature effects on the electrical conductivity of dielectric liquids and proposed an empirical correlation that accounts for the variation in the electrical conductivity of dielectric liquids with temperature [10].…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Temperature, Moisture and Electric Field on the Electrical Conductivity of Oil-Impregnated Pressboard

Zhou

Zhu

et al. 2019

Energies

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The main insulation of converter transformers consists of transformer oil and oil-impregnated pressboard. Under operating conditions, the valve-side winding of the converter transformer is subject to DC voltage components. Therefore, studies on the characteristics of oil-impregnated pressboard conductivity are necessary. In this paper, the temperature, moisture and electric field dependency of pressboard conductivity are investigated based on a specially designed three-electrode experimental chamber, which allows for a variation in temperature ranging from 25 °C to 120 °C and an electric field strength ranging from 0 to 30 kV/mm. The experimental results show that, within the experimental conditions, the conductivity of oil-impregnated pressboard increases exponentially with increasing moisture and temperature. High moisture and temperature will increase both the carrier concentration and carrier mobility, which explains the exponential correspondence. Furthermore, the electric field dependency of the conductivity is more obvious for wet pressboard than for dry pressboard. Protons in the wet pressboard are more easily accelerated by the electric field than the impurity ions in the oil of the dry pressboard, which leads to an obvious electric field dependency of the wet pressboard conductivity.

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Study on moisture influence on electrical conductivity of natural ester fluid and mineral oil

Cited by 9 publications

References 2 publications

Titania‐based transformer nanofluid: a study on the synthesis for enhanced breakdown strength and its humidity ageing

Titania‐based transformer nanofluid: a study on the synthesis for enhanced breakdown strength and its humidity ageing

Oil Impregnated Pressboard Barrier Systems Based on Ester Fluids for an Application in HVDC Insulation Systems

Study on the Influence of Temperature, Moisture and Electric Field on the Electrical Conductivity of Oil-Impregnated Pressboard

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