595 / 2022-03-30 16:40:52

The influence of surface roughness of metal electrode on the AC breakdown voltage of an Environmental-Friendly Insulation C5F10O/CO2

insulation gas,C5F10O/CO2,surface roughness,AC breakdown strength

As the greenhouse effect of SF₆ emission from power industry cannot be ignored, the environmental-friendly insulating gas C₅F₁₀O is considered to have the potential to replace SF₆ in cubic gas insulated switchgears. To explore the influence of surface roughness of metal conductor on AC breakdown voltage of C₅F₁₀O/CO₂ gas in equipment, the AC breakdown characteristics of C₅F₁₀O/CO₂, SF₆ and CO₂ gases with different volume fractions under different electrode surface roughness was studied, and the synergistic sensitivity of insulation characteristics of C₅F₁₀O/CO₂ mixture to metal surface roughness and partial pressure ratio was studied. The results show that the AC breakdown voltage of C₅F₁₀O/CO₂ gas is negatively related to the surface roughness of the electrode. The micro-bumps in the local rough area of the electrode surface will cause local field strength distortion and local ionization coefficient enhancement, and the AC breakdown voltage of all gases will decrease. As the proportion of C₅F₁₀O increases, the dielectric strength of the mixed gas is strengthened.