Comparative Study of Kraft Paper Aged in Natural Ester with XRD and TG/DTG Analysis

Sari, Yulia Erina; Ritonga, Alvin Daniel Sorimuda; Suwarno, &

doi:10.1109/iceei47359.2019.8988785

Cited by 7 publications

(2 citation statements)

References 18 publications

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“…Cellulosic materials are typically composed of intermittent crystalline and amorphous cellulose regions, 31,32 and the proportion of amorphous regions in the insulating paper is considerably 30%-50%. 33,34 The moisture content of the cellulose insulating paper in the actual operating power equipment is very low, which corresponds to the initial stage of moisture adsorption in cellulose and occurs mainly in the amorphous region. 3,35,36 In addition, for polymer dielectrics, the trap localized states are mainly distributed in the amorphous region.…”

Section: A Computational Detailsmentioning

confidence: 99%

Mechanism study of the conductivity characteristics of cellulose electrical insulation influenced by moisture

Zhao

Zhang

et al. 2022

Journal of Applied Physics

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Cellulose insulating paper is widely used in the power industry for its good electrical insulating properties. Moisture sharply increases its conductivity, which directly leads to the weakening of insulation performance and greatly increases the risk of subsequent electric field distortion and insulation breakdown. This paper focuses on the microscopic mechanism of moisture changing the characteristics of charge transport in cellulose insulation and attempts to reveal the related conductivity mechanism. To achieve this purpose, microscopic and macroscopic perspectives are integrated and several simulation and experimental methods are utilized comprehensively. The molecular dynamics simulation results showed that most water molecules in damped cellulose were individually and uniformly adsorbed on the hydroxyl groups by hydrogen bond, and the quantum chemistry computation results showed that the lowest unoccupied molecular orbital more appeared on the water molecule and the corresponding density of state increased. Then, experimentally, it was confirmed that the trap energy level decreased by the thermally stimulated current method. On this basis, the promotion effect of moisture on charge transport is predicted and verified by polarization and depolarization current methods. As the moisture content increased, more charge carriers escaped from the trap by hopping and participated in long-range continuous charge motion. Therefore, after dampness, the current of cellulose insulating paper increased exponentially with the increase in electric field strength, which was consistent with the hopping conductivity mechanism.

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Section: A Computational Detailsmentioning

confidence: 99%

Mechanism study of the conductivity characteristics of cellulose electrical insulation influenced by moisture

Zhao

Zhang

et al. 2022

Journal of Applied Physics

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“…Prior to thermal aging, the moisture content of the insulating liquids and the paper dielectric were reduced, to obtain dielectric samples with moisture content in accordance with the standards [31]. To reduce the moisture content, the two insulating liquids and the dielectric paper were heated at a temperature of 80˚C for 24 hours.…”

Section: Preparation Of the Samples For Thermal Agingmentioning

confidence: 99%

Comparative Evaluation of the Thermal Aging of Solid Insulation in Mineral Oil and Methyl Ester of Palm Kernel Oil

Boyekong¹,

Mengounou²,

Imano³

2021

JPEE

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The purpose of this work is to determine the impact of thermal aging on the dielectric and physicochemical properties of the oil/paper mixed insulation. We performed a comparative analysis of dielectric paper dipped in two cooling fluids: palm kernel oil methyl ester (MEPKO) and mineral oil (MO). Two types of dielectric paper were used: Thermally Upgraded Kraft paper (TUK) and Nomex-910 paper (NP-910). An accelerated aging test was realized at 110˚C during a total of 96 hours. Samples of oil and paper were collected after 0, 48, 72 and 96 hours for analyses purposes. The analyses performed included the measurement of the Breakdown voltage (BDV) of the dielectric papers, the Total Acid Number (TAN) and the Decay Dissolved Products (DDP) of the liquid dielectrics. The BDV of NP-910 is greater than the BDV of TUK. Concerning the type of oil, the BDV of dielectric papers impregnated with MEPKO is greater than the BDV of similar papers impregnated with MO, indicating a better preservation of paper when dipped in methyl esters. The analyses of TAN and DDP revealed that Nomex-910 improves the oxidation stability of MO, but reduces the oxidation stability of MEPKO. These results prove that methyl esters can be used as a substitute to replace mineral oils in power transformers. Furthermore, they show that NP can be used mainly in areas of transformer where solid insulation is subjected to high thermal and electrical stress, and TUK other places where solid insulation is required. Such combination could assure money savings and a better preservation of the oil viscosity.

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Investigation of the thermal aging of the natural monoester/paper mixed insulation

et al. 2022

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Comparative Study of Kraft Paper Aged in Natural Ester with XRD and TG/DTG Analysis

Cited by 7 publications

References 18 publications

Mechanism study of the conductivity characteristics of cellulose electrical insulation influenced by moisture

Mechanism study of the conductivity characteristics of cellulose electrical insulation influenced by moisture

Comparative Evaluation of the Thermal Aging of Solid Insulation in Mineral Oil and Methyl Ester of Palm Kernel Oil

Investigation of the thermal aging of the natural monoester/paper mixed insulation

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