Effect of the relaxation time of mineral oil and monoesters on the fractal dimension and mutual information of creeping discharges propagating along a pressboard

Jiosseu, Jean Lambert; Mengounou, Ghislain Mengata; Nkouetcha, Emeric Tchamdjio; Imano, Adolphe Moukengue

doi:10.1016/j.heliyon.2023.e16796

Cited by 4 publications

(2 citation statements)

References 33 publications

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“…In accordance with IEC60641-2, paper samples were previously dried in a forced convection oven heated to 105 °C for 48 h. Then at low pressure at 85 °C for 48 h. The insulating liquids used in this study are: mineral oil (MO), palm kernel oil methyl ester (PKOME) and castor oil methyl ester (COME). These monoesters were obtained by a degumming and transesterification process fully detailed in previous open access publications 16 , 17 . After chemical treatment, the liquids were also dried for 48 h at 85 °C before introducing the paper samples.…”

Section: Methodsmentioning

confidence: 99%

Combined effect of lightning impulse voltage and temperature stress on the propagation of creeping discharge of oil-impregnated paper

Jiosseu,

Foumi Nkwengwa,

Mengata Mengounou

et al. 2024

Sci Rep

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This article presents the results of an experiment designed to study the impact of temperature on the characteristic parameters of creeping discharges. The insulating interfaces consist of a thermally enhanced cellulose surface immersed in mineral oil, palm kernel oil methyl ester (PKOME) and castor oil methyl ester (COME). The study was carried out under a standard negative lightning impulse voltage (1.2/50 μs). The article also presents the complete algorithms for calculating the maximum extension of the discharges, the ionisation rate and the charge produced by them. The results of the study show that temperature favors the propagation of discharges and the ionisation rate. It was observed that liquids with a higher dielectric constant and high electrical conductivity were more exposed to the impact of temperature. The results show ionisation increments of 0.973%/°C, 1.093%/°C and 1.076%/°C in mineral oil (MO), COME and PKOME respectively. The maximum extension of the discharges shows a linear evolution with the applied voltage and temperature but a non-linear increment with the temperature. As for the charge produced, it shows a constant increment with temperature and voltage in each liquid. These values are (5.839%/°C, 1.977%/kV), (6.047%/°C, 2.082%/kV) and (6.177%/°C, 2.113%/kV) respectively in MO, COME and PKOME.

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Section: Methodsmentioning

confidence: 99%

Combined effect of lightning impulse voltage and temperature stress on the propagation of creeping discharge of oil-impregnated paper

Jiosseu,

Foumi Nkwengwa,

Mengata Mengounou

et al. 2024

Sci Rep

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“…Among the solutions proposed to improve the performance of triesters in terms of viscosity and heat transfer, work in the literature has shown that a transesterification process has proved very effective in this regard. This protocol is widely used in the production of biofuels and has now been proposed as an alternative solution in the field of high voltage insulation 27 – 30 . The transesterification process removes two acid chains and changes the oil from a triester to a monoester.…”

Section: Introductionmentioning

confidence: 99%

Statistical analysis of the impact of FeO3 and ZnO nanoparticles on the physicochemical and dielectric performance of monoester-based nanofluids

Jiosseu

Jean-Bernard

Mengounou

et al. 2023

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This article deals with a comparative study of the physicochemical and electrical properties of monoesters of castor oil compared with their counterparts based on FeO3 and ZnO nanoparticles. The results are also compared with those in the literature on triesters, and also with the recommendations of the IEEE C 57.14 standard. The data is analysed statistically using a goodness-of-fit test. The analysis of the viscosity data at 40 °C shows an increase in viscosity. For concentrations of 0.10 wt%, 0.15 wt% and 0.20 wt% these are respectively 5.4%, 9.69%, 12.9% for FeO3 NFs and 7.6%, 9.91% and 12.7% for ZnO NFs. For the same concentrations, the increase in acid number is respectively 3.2%, 2.9%, 2.5% for FeO3 samples and 3.18%, 2.0%, 1.2% for ZnO samples. For the same concentrations, the fire point shows an increment of 4%, 3% and 2% for FeO3 samples and a regression of 8.75%, 6.88% and 5.63% for ZnO samples. As for the breakdown voltage, for the same concentrations we observe respectively an increment of 43%, 27%, 34% for the FeO3. The results show an improvement on partial discharge inception voltage with FeO3 of 24%, 8.13% and 15.21% respectively for the concentrations 0.10 wt%, 0.15 wt% and 0.20 wt%.

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Behavior of Creeping Discharges Propagating Along a Pressboard Immersed in Z_nO-Based Nanofluid of Monoesters

Jiosseu,

Mengounou,

Nkouetcha

et al. 2024

IEEE Trans. Dielect. Electr. Insul.

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Effect of the relaxation time of mineral oil and monoesters on the fractal dimension and mutual information of creeping discharges propagating along a pressboard

Cited by 4 publications

References 33 publications

Combined effect of lightning impulse voltage and temperature stress on the propagation of creeping discharge of oil-impregnated paper

Combined effect of lightning impulse voltage and temperature stress on the propagation of creeping discharge of oil-impregnated paper

Statistical analysis of the impact of FeO3 and ZnO nanoparticles on the physicochemical and dielectric performance of monoester-based nanofluids

Behavior of Creeping Discharges Propagating Along a Pressboard Immersed in Z_nO-Based Nanofluid of Monoesters

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Effect of the relaxation time of mineral oil and monoesters on the fractal dimension and mutual information of creeping discharges propagating along a pressboard

Cited by 4 publications

References 33 publications

Combined effect of lightning impulse voltage and temperature stress on the propagation of creeping discharge of oil-impregnated paper

Combined effect of lightning impulse voltage and temperature stress on the propagation of creeping discharge of oil-impregnated paper

Statistical analysis of the impact of FeO3 and ZnO nanoparticles on the physicochemical and dielectric performance of monoester-based nanofluids

Behavior of Creeping Discharges Propagating Along a Pressboard Immersed in ZnO-Based Nanofluid of Monoesters

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Behavior of Creeping Discharges Propagating Along a Pressboard Immersed in Z_nO-Based Nanofluid of Monoesters