In accordance with the unclear scattering gas production characteristics and unknown mechanisms of natural ester insulating oil

this paper establishes an electro-thermal combined stress and cyclic flow experimental platform to investigate the effects of electric field strength

temperature

and flow characteristics on the stray gas production of natural ester insulation oil; the molecular dynamics simulations based on ReaxFF are conducted to elucidate the process and mechanism of gas evolution under electro-thermal combined stress in natural ester insulating oils at both macroscopic and microscopic levels. Experimental and simulation results indicate that

with increasing electric field strength

the content of characteristic gases increases exponentially

and the contents of H2

CO

and CO2 in high electric field samples exceed those in 0 kV/mm samples by 3 to 5 orders of magnitude. The production of characteristic gases increases with the increase of temperature. Increasing the circulation flow of oil samples significantly reduces the production of characteristic gases. In the electrothermal decomposition process

higher electric field strength and longer duration intensify the decomposition of ester molecules

with H2 and CO2 being the main gas products throughout the electro-thermal decomposition process. There are minor differences in gas production pathways among different triglycerides. The achievements of this study provide theoretical guidance and technical references for achieving comprehensive diagnosis of dissolved gases in vegetable insulating oil

effectively assessing the operational status of transformers.