The impact of aging products on modified insulation oil–paper systems

With the rapid development of ultra-high voltage transmission projects, higher requirements have been placed on the performance of transformer insulation paper, which directly affects the safe and stable operation of transformers. The transformer oil–paper insulation system is subject to various factors, such as electrical stress, thermal stress, mechanical stress, and humidity, during long-term operation, leading to aging or failure. The aging products (such as H2O, CO2, CH4, and CHOOH) produced during this process will diffuse in the oil–paper insulation system, thereby reducing the insulation performance. This paper uses molecular dynamics simulation to build four models of insulation paper doped with aging products. By studying the diffusion coefficient, free volume, and interaction parameters, the performance parameters of meta aramid insulation paper insulation paper and cellulose insulation paper under aging gases are simulated and compared. It also analyzes whether the addition of nanoclusters can weaken the impact of aging products. In addition, the Confined Layer module is used to build an oil-cellulose mixed oil–paper insulation system. By studying the trajectory movement behavior of different aging gases, the interaction between different gases, and the impact of different types of insulation paper, this paper explores the diffusion behavior of multiple aging gases in the oil–paper insulation system, providing a theoretical basis for the development of a high-performance nano-modified insulation paper.