Experimental analyses and molecular simulation of the thermal aging of transformer insulation paper

Tang, Chao; Zhang, Song; Xu, Li Li; Xiong, Bifeng; Xie, Jingyu

doi:10.1109/tdei.2015.005003

Cited by 26 publications

(14 citation statements)

References 19 publications

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“…Chen et al [23] suggested that, for the amorphous models of cellulose with a DP of 20, the mechanic properties obtained by molecular simulation were consistent with the experimental data. Meanwhile, our previous research results [24,25] also verified the consistency of molecular simulation and experiment results when DP is 20. Therefore, in this paper, a cellulose chain with a DP of 20 was chosen to build the model.…”

Section: Model Buildingsupporting

confidence: 62%

Thermal Stability of Modified Insulation Paper Cellulose Based on Molecular Dynamics Simulation

Tang

Zhang

Wang³

et al. 2017

Energies

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Abstract:In this paper, polysiloxane is used to modify insulation paper cellulose, and molecular dynamics methods are used to evaluate the glass transition temperature and mechanical properties of the paper before and after the modification. Analysis of the static mechanical performance of the model shows that, with increasing temperature, the elastic modulus of both the modified and unmodified cellulose models decreases gradually. However, the elastic modulus of the modified model is greater than that of the unmodified model. Using the specific volume method and calculation of the mean square displacement of the models, the glass transition temperature of the modified cellulose model is found to be 48 K higher than that of the unmodified model. Finally, the changes in the mechanical properties and glass transition temperature of the model are analyzed by energy and free volume theory. The glass transition temperatures of the unmodified and modified cellulose models are approximately 400 K and 450 K, respectively. These results are consistent with the conclusions obtained from the specific volume method and the calculation of the mean square displacement. It can be concluded that the modification of insulation paper cellulose with polysiloxane will effectively improve its thermal stability.

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Section: Model Buildingsupporting

confidence: 62%

Thermal Stability of Modified Insulation Paper Cellulose Based on Molecular Dynamics Simulation

Tang

Zhang

Wang³

et al. 2017

Energies

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“…Using molecular dynamics (MD), a cost-effective scientific tool, the property changes of a substance and their microscopic mechanisms [ 24 , 25 , 26 , 27 , 28 , 29 ] can be studied at the molecular and atomic levels. In this work, the effect of moisture on the properties of meta-aramid fiber insulating paper was studied using MD to explore the micromechanism.…”

Section: Introductionmentioning

confidence: 99%

Effect of Moisture on Mechanical Properties and Thermal Stability of Meta-Aramid Fiber Used in Insulating Paper

Yin

Tang

et al. 2017

Polymers

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Seven composite models of meta-aramid fibers with different moisture contents were studied using molecular dynamics simulation. The effects of moisture on the thermal stability and mechanical properties of the fibers and their mechanisms were analyzed, considering characteristics such as hydrogen bonding, free volume, mean square displacement, and mechanical parameters. The simulation results showed that the large number of hydrogen bonds between water molecules and meta-aramid fibers destroyed the original hydrogen-bond network. Hydrogen bonds between the molecular chains of meta-aramid fibers were first destroyed, and their number decreased with increasing moisture content. The free volume of the fibers thereby increased, the interactions between fiber chains weakened with increasing moisture content, and the fiber chain movement intensified accordingly. The ratio of diffusion coefficients of the water molecules to moisture contents of the composite models increased linearly, and the water molecule diffusion increased, which accelerated the rate of damage to the original hydrogen-bond network of the meta-aramid fibers and further reduced their thermal stability. In general, the mechanical properties of the composites were negatively related to their moisture content.

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“…In fact, releasing all constraints would require a larger model that would entail more time for the simulation. Structural optimization and molecular dynamics (MD) were carried out using the second-generation polymer consistent force field (PCFF) [ 29 , 30 , 31 , 32 , 33 ] especially suited for carbohydrates and polymers [ 34 , 35 ]. The target temperatures of all MD were set to the practical transformer service temperature of 343 K. All simulations were carried out for 500 ps in the NVT ensemble.…”

Section: Calculation Methodsmentioning

confidence: 99%

Investigation on the Interaction between Cellulosic Paper and Organic Acids Based on Molecular Dynamics

Zhu¹,

Gu²,

Zhu³

2020

Molecules

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Organic acid is an important factor that accelerates the aging of cellulosic insulation materials. In this study, the interactions between cellulose and five acids, representative of what may be found in an aging transformer, were studied using molecular dynamics. The adsorption process of the five acids onto the surface of crystalline cellulose shows that the three low molecular acids are more readily adsorbed onto cellulose than the two high molecular acids. The deformation and adsorption energies of the acids all increase with an increase in molecular weight when they are stably interacting with cellulose. However, the differences between adsorption energies and deformation energies are positive for the three low molecular acids, whereas they are negative for the two high molecular acids. This indicates that the attachments onto cellulose of low molecular acids are considerably more stabilized than those of the high molecular acids. This is consistent with the experimental results. Furthermore, based on the calculated solubility parameters of acids, the experimental result that the three low molecular acids are to a large degree absorbed onto the cellulose, whereas the two high molecular acids remain in the oil, was theoretically elucidated using the theory of similarity and intermiscibility.

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Experimental analyses and molecular simulation of the thermal aging of transformer insulation paper

Cited by 26 publications

References 19 publications

Thermal Stability of Modified Insulation Paper Cellulose Based on Molecular Dynamics Simulation

Thermal Stability of Modified Insulation Paper Cellulose Based on Molecular Dynamics Simulation

Effect of Moisture on Mechanical Properties and Thermal Stability of Meta-Aramid Fiber Used in Insulating Paper

Investigation on the Interaction between Cellulosic Paper and Organic Acids Based on Molecular Dynamics

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