Molecular Dynamics Simulation Analysis of Insulating Oil-paper Pyrolysis

China’s ultra high voltage direct current (UHV DC) transmission lines are increasing day by day, and the converter transformer is one of the core equipment of UHV DC transmission, so its safety and stability affect the stability of the entire system. In converter transformer faults, insulation faults account for the largest proportion. The insulation of converter transformers is affected by high temperature during operation and is prone to deterioration. Most of the current research studies on converter transformer insulation from the macro level, Using molecular dynamics from the micro level to study the products and production pathways of insulating oil-paper degradation is of great significance for understanding the degradation of converter transformer insulation. In this paper, insulating oil-paper molecular models are first built, and molecular dynamics simulation is used to reveal the generation path of insulating oil products. Then, the simulation of insulating oil paper mixing system is carried out to reveal the mechanism of insulating oil-paper degradation at high temperature.