Electrical characteristics of natural ester impregnated pressboards under different periods of impregnation

Jariyanurat, K.; Maneerot, Sakda; Pattanadech, Norasage; Potivejkul, S.

doi:10.1109/cmd.2016.7757835

Cited by 8 publications

(10 citation statements)

References 2 publications

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“…(2) By transforming the capillary volume impregnated in function of the radius and length, and by integration, this law can be formulated as in (3).…”

Section: Impregnation Theoretical Basismentioning

confidence: 99%

“…The impregnation step of transformer's solid insulators with dielectric oil during the manufacturing of these electric machines could condition their life expectancy. It is known the role of oils as boosters of the dielectric capacities of transformer solid insulators [1]- [3]. An incorrect impregnation procedure or an excessive haste in the commissioning of one of these machines may lead to the presence of air voids, reducing the insulating capacities of the dielectric papers and promoting the occurrence of failures potentially catastrophic [4] [5].…”

Section: Introductionmentioning

confidence: 99%

“…In the case of the studies of Jariyanurat et al [3] they compared the dielectric properties of pressboard samples impregnated with a mineral oil and a natural ester during three different time laps. They noticed that the benefits of oil impregnation on the pressboard dielectric strength, more intense as more lasted the impregnation, were more pronounced in those with natural ester.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study of the Impregnation of Power-Transformer Cellulosic Materials With Dielectric Ester Oils

Sanz

Sancibrian

Olmo³

et al. 2021

IEEE Access

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The application of alternative dielectric oils as esters in power transformers is hindered by the lack of knowledge regarding their properties and respecting which are the best techniques to ensure their proper performance. In this sense one of the fields needing an impulse is the impregnation processes of transformers cellulosic materials with these alternative oils, currently impregnated in most of the cases with mineral oils. This paper studies the impregnation behavior of eight usual dielectric solids, with two esters and a traditional mineral oil. Empirical equations of the impregnation evolution with time have been obtained, from these the rigid cellulosic materials present in the transformers and the viscosity of the dielectric oils have been identified as the key materials and properties to consider during impregnation. An adaptation of the current impregnation processes to the alternative oils have been proposed by increasing their temperature from ambient temperature up to 61-74ºC, depending on the viscosity of the oil used. INDEX TERMS dielectric, ester, impregnation, model, transformer, temperatureThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.

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“…(2) By transforming the capillary volume impregnated in function of the radius and length, and by integration, this law can be formulated as in (3).…”

Section: Impregnation Theoretical Basismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study of the Impregnation of Power-Transformer Cellulosic Materials With Dielectric Ester Oils

Sanz

Sancibrian

Olmo³

et al. 2021

IEEE Access

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“…These authors compared the degree of impregnation in mineral oil, a natural ester, and a synthetic ester, finding that the required time to get an adequate impregnation is a function of the viscosity and capillary effect of oil inside cellulose material. It was also found that high temperature can help overcome the higher dynamic viscosity of vegetable insulating oil than mineral oil [34][35][36]. Additionally, it was discovered that the time duration of impregnation significantly affects the dielectric properties of the natural ester impregnated pressboard, such as the capacitance and dielectric dissipation factor [35,36].…”

Section: Impregnation Processmentioning

confidence: 99%

“…It was also found that high temperature can help overcome the higher dynamic viscosity of vegetable insulating oil than mineral oil [34][35][36]. Additionally, it was discovered that the time duration of impregnation significantly affects the dielectric properties of the natural ester impregnated pressboard, such as the capacitance and dielectric dissipation factor [35,36].…”

Section: Impregnation Processmentioning

confidence: 99%

Use Performance and Management of Biodegradable Fluids as Transformer Insulation

et al. 2021

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In recent years, the use of biodegradable fluids as liquid insulation for distribution and power transformers is spreading. The main biodegradable fluids used are natural and synthetic esters, although biodegradable hydrocarbons have been recently proposed. Biodegradable fluids have a much lower environmental impact than mineral oil, limiting the risk of soil contamination in leaks, which makes them a suitable solution for applications such as offshore transformers or railway transformers. Additionally, these fluids have a higher flash point than conventional mineral oils, which dramatically reduces the risk of fire and collateral damage derived from explosion and fire. Despite these advantageous factors, there are still some aspects that hinder the broadening of their use, such as the difference in thermal properties or the lack of accepted maintenance procedures for transformers that use them as liquid insulation. This paper presents the current status of biodegradable insulating fluids, analyzing some of their properties and discussing the aspects that are still to be investigated in order to make them a real alternative to petroleum-based fluids.

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Polarization and Depolarization Current Characteristics of Natural Ester Impregnated Pressboards with Different Periods of Impregnation

Maneerot

Siriworachanyadee

Likhitsupin

et al. 2020

2020 8th International Conference on Condition Monitoring and Diagnosis (CMD)

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Electrical characteristics of natural ester impregnated pressboards under different periods of impregnation

Cited by 8 publications

References 2 publications

Study of the Impregnation of Power-Transformer Cellulosic Materials With Dielectric Ester Oils

Study of the Impregnation of Power-Transformer Cellulosic Materials With Dielectric Ester Oils

Use Performance and Management of Biodegradable Fluids as Transformer Insulation

Polarization and Depolarization Current Characteristics of Natural Ester Impregnated Pressboards with Different Periods of Impregnation

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