Abstract
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.
Highlights
Cellulosic paper is a major component of the transformer insulation system
The increase in molecular weight of the acid molecule inevitably leads to an increase in adsorption energy, but this cannot possibly indicate that the acid molecule would be adsorbed onto the cellulose more steadily
The changes in distances of centroids of the five organic acid molecules from the surface of cellulose indicate that the three low molecular acids are more readily adsorbed onto cellulose than the two high molecular acids
Summary
Cellulosic paper is a major component of the transformer insulation system. It deteriorates with age, leaving the insulation vulnerable to stresses generated by thermal, mechanical and electrical transients [1,2,3]. The effects of different organic acids on the agingtechnology of cellulose have been widely studied, methods, In recent years, with the improvements in computer and computational most relevant studies have been confined to laboratory experiments due to the complexity of the molecular simulation has developed into an effective means of analyzing complex systems at the physiochemical process of the aging of cellulose. Theregarding study of molecular structures, and ofisdifferent a powerful to complement experiments It helps in examining the the different effects acids ontool the aging of cellulosic paper at the microscopic level can help shed light on the aging mechanism of the oil-paper insulation of transformers. Molecular simulation can reveal detailed information regarding organic molecular structures, and is a powerful tool to complement experiments It helps in examining the micro-mechanisms of the aging process of cellulosic paper caused by organic acids
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