Abstract
Molecular simulation techniques are widely used to study transformer insulation material characteristics and nano-modification mechanism. However, there are numerous researches on the thermal stability and dielectric properties of nano-modified cellulose insulation paper, and few studies have combined nano-modification with the process of electrical-thermal aging. This study established SiO2/Cellulose models with different weight percentages to calculate their average number of hydrogen bonds (AHB), glass transition temperature (Tg ) and relative permittivity (RP) under electro-thermal coupling. The study indicates that the 5wt% SiO2/Cellulose model exhibits the best modification effect. Temperature is the primary factor causing aging of the cellulose insulation paper, and the introduction of an electric field accelerates the thermal aging of the cellulose insulation paper. Increasing hydrogen bond quantity and restricting molecular chain movement are key factors that enhance insulation materials anti-aging performance.
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