Determination of moisture diffusion coefficient in transformer paper using thermogravimetric analysis

García, Diego; García, Belén; Burgos, Juan Carlos; García-Hernando, N.

doi:10.1016/j.ijheatmasstransfer.2011.10.004

Cited by 20 publications

(15 citation statements)

References 27 publications

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“…This model assumes that the product is a continuum material at the macroscopic scale and describes the combined mass transfer of liquid and water vapor using an effective diffusion mass transfer coefficient (D). This model was considered in this work because it may represent the most widely used mass transfer model to describe the addition or removal of water content and has been validated for many chemical, pharmaceutical or bioproducts [17][18][19][20][21][22][23][24]. A rectangular product of dimensions L Â l Â w, where L >> w, l >> w and w is the product thickness was considered:…”

Section: Mass Transfer Modelmentioning

confidence: 99%

Effect of the water content measurements on the estimation and identifiability of water diffusion and convection mass transfer coefficients

Mercier

Marcos

Moresoli

et al. 2015

International Journal of Heat and Mass Transfer

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Section: Mass Transfer Modelmentioning

confidence: 99%

Effect of the water content measurements on the estimation and identifiability of water diffusion and convection mass transfer coefficients

Mercier

Marcos

Moresoli

et al. 2015

International Journal of Heat and Mass Transfer

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“…From investigations mainly focused on the determination of the diffusion coefficient of the impregnated and non-impregnated paper and pressboard used in power transformers, Garcia et al proposed the following equation for determining the diffusion coefficient [21,22]:…”

Section: Introductionmentioning

confidence: 99%

Modeling the Insulation Paper Drying Process from Thermogravimetric Analyses

et al. 2018

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Abstract:It is now well-established that moisture in the oil paper insulation used in power and instrument transformers significantly reduces the transformers' lifetimes, and can eventually lead to premature failure. This moisture should, therefore, always be removed, not only during production but also after repairs. At the final stage of manufacturing, the drying process should be carried out to remove water and air vacuoles contained in the cellulose-based paper before impregnation. Successful drying helps increase the residual life of transformers, because the presence of moisture and air vacuoles accelerates the aging/degradation process of the oil paper insulation. Proper estimation of residual moisture before impregnation and the determination of the time required for drying play key roles in the time-consuming process of drying. In this paper, the disadvantages of inadequate drying are addressed, followed by a mathematical approach to model the paper drying process. A mathematical model describing the kinetics of drying according to temperature, initial moisture, paper weight, final moisture, and extraction rate is proposed. This model also estimated the amount of moisture removed at the end of the drying process.

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“…Although in the last years different authors have proposed expressions for moisture diffusion coefficient in Kraft paper [10][11][12], much less work has been done to determine the coefficients in pressboard.…”

Section: Introductionmentioning

confidence: 99%

Diffusion coefficient in transformer pressboard insulation part 1: non impregnated pressboard

Villarroel

García

et al. 2014

IEEE Trans. Dielect. Electr. Insul.

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Water is harmful for transformers; the dynamic behavior of moisture influences the dielectric integrity and insulation aging in a transformer on operation. In this paper, the determination of the diffusion coefficient of moisture in transformer pressboard is tackled. This work has been focused in analyzing non oil-impregnated pressboard, so the obtained coefficient is useful for studying the processes of transformer drying in factory. Drying experiments were developed in a thermogravimetric analyzer on nonimpregnated samples of pressboard subjected to different drying temperatures. The experimental conditions were simulated by means of a diffusion model implemented by means of Finite Element Method. The comparison between estimated and measured values allows drawing conclusions about the accuracy of the proposed coefficient.

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Determination of moisture diffusion coefficient in transformer paper using thermogravimetric analysis

Cited by 20 publications

References 27 publications

Effect of the water content measurements on the estimation and identifiability of water diffusion and convection mass transfer coefficients

Effect of the water content measurements on the estimation and identifiability of water diffusion and convection mass transfer coefficients

Modeling the Insulation Paper Drying Process from Thermogravimetric Analyses

Diffusion coefficient in transformer pressboard insulation part 1: non impregnated pressboard

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