Abstract
Molecular dynamics simulations were used to analyze the internal mechanism for the observed improvement in performance of nano-modified meta-aramid insulation paper from a microscopic point of view. The results showed that the k-polyphenylsilsesquioxane(PPSQ) modified meta-aramid insulation paper was superior to b-PPSQ modified meta-aramid insulation paper in terms of its thermal stability and mechanical and electrical properties. The analysis of microscopic parameters showed that the stiffness of k-PPSQ was less than that of b-PPSQ, and the hydroxyl groups on the open-loop system were more likely to enter the dispersed system, resulting in higher bonding strength, meta-aramid fiber chains between k-PPSQ molecules, and the formation of hydrogen bonds. Additionally, the nano-enhancement effects of k-PPSQ and b-PPSQ resulted in various improvements, including a reduction in pores between molecules in the blend model, an increase in the contact area, the formation of interfacial polarization, and a reduction in defects at the interface.
Highlights
IntroductionThe growth of global energy transmission networks has necessitated the use of transmission lines with ultra-high voltages, large capacities, and long distances [1,2]
Thermal, Mechanical, and ElectricalThe growth of global energy transmission networks has necessitated the use of transmission lines with ultra-high voltages, large capacities, and long distances [1,2]
The addition of k-PPSQ introduced a large number of traps in the interfacial area, which resulted in a reduction of the energy of electrons and increased the breakdown field strength by 5.86% compared with the unmodified material
Summary
The growth of global energy transmission networks has necessitated the use of transmission lines with ultra-high voltages, large capacities, and long distances [1,2]. The prolonged service life of transformers and the complex electric field distribution in ultra-high voltage transformers mandates high performance requirements from traditional cellulose insulation paper. This has resulted in increased research on transformer insulation and the utilization of new insulation materials [9,10,11]. There are few reports on the modification of meta-aramid insulation paper by PPSQ It is of great engineering practice value to study the performance of transformer insulation paper modified by different structures of nanoparticles in the normal temperature range of transformer aging research. Through a combination of experimental studies and molecular dynamics (MD) simulations, the effects of the different structures of PPSQ on the properties of the meta-aramid insulation paper and its internal mechanism were investigated
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