Inhibition Effect of Solid Products and DC Breakdown Characteristics of the HFO1234Ze(E)-N₂-O₂ Ternary Gas Mixture

HFO1234ze(E) is an environmentally friendly SF₆ substitute gas with prominent application potential. To suppress the generation of the HFO1234ze(E) solid decomposition products, which may cause great hazards to the gas-solid insulation strength, a gas mixing scheme screening method based on the reactive force field (ReaxFF) molecular dynamics (MD) simulation was innovatively proposed. The simulation results show that the inhibitory effect of O₂ on the formation of HFO1234ze(E) solid products is better than those of CO₂ and CF₄. Further study shows that when O₂ accounts for 3.33% of the gas mixture, the solid precipitate content is reduced by 48%. The experimental study shows that an O₂ content of 3.33% can inhibit the generation of solid products by more than 50%. Besides, compared with HFO1234ze(E)-N₂, the DC breakdown voltage of HFO1234ze(E)-N₂-O₂ is slightly increased, and the breakdown voltage dispersion degree and continuous breakdown voltage drop rate are decreased. This work gives a feasible solution for the suppression of HFO1234ze(E) solid decomposition products and provides an efficient method for solving similar problems of environmentally friendly insulating gas in C/F/O/N systems.