The oil-immersed reactor is one of the important equipment in the high-voltage and long-distance power transmission and transformation system. The ultra-high voltage (UHV) reactor in abnormal operation would produce gas, which is a concerning problem at the current project site. The system consisting of iron core, cellulose blocks and iron yokes in reactors may have mechanical resonance phenomena during operation. And vibration friction leads to metal losses, which would accelerate the decomposition of insulating oil and paper. In order to explore the influence of different combined contact structures on the dissolved gas content in the insulating oil under vibration mode, a gas production simulation platform in reciprocating vibration mode was designed. The results indicated that the vibration mode can promote the formation of CO and CO₂, which may be due to the vibration promoting the oxidation reaction. In the equipment’s long-term vibration, the contact combination structure will keep the CO gas content at a higher level. However, vibration inhibits the generation of CH₄. The combination of insulating paperboard-silicon steel and insulating paperboard-block contact will promote the generation of hydrocarbon gas in vibration mode, especially the combination of insulating paperboard-block contact will increase the CO₂ and CH₄ gas content significantly.

vibration,gas behavior,contact combination structure,oil-paper insulation