Study on Influence of O2 on Interface Flashover and Solid Precipitation Characteristics in Ternary Gas Mixture C4F7N/CO2/O2
By adding a certain amount of O2 to the eco-friendly gas mixture C4F7N/CO2 to form a ternary gas mixture,the deep decomposition of C4F7N and the formation of solid by-products can be restricted.This approach has thus found application in some eco-friendly substitution solutions.However,the specific effects of O2 introduction on gas-solid interface discharge characteristics and solid by-product formation have not been thoroughly investigated.Currently,the O2 content in most ternary gas mixture schemes lacks a solid basis.To explore the appropriate oxygen mixing ratio,this paper investigates the gas-solid interface flashover characteristics of the C4F7N/CO2/O2 ternary gas mixture.The study examines the effects of O2 content and C4F7N content on flashover voltage.Additionally,it analyzes the flashover discharge current at the gas-solid interface and the macroscopic/microscopic images of the interface after discharge under the ternary gas mixture.The results indicate that the O2 content has minimal overall impact on flashover discharge voltage and discharge current amplitude.Therefore,when formulating the mixture scheme,the primary consideration should be its effect on decomposition characteristics.However,a high O2 content can exacerbate erosion near the triple junction of gas,electrode,and insulation material,enhancing the gas pyrolysis process within the discharge channel,leading to the formation of erosion pits or accumulation of black solid by-products,which negatively impact the system's insulation level.In practical applications,the O2 content should not exceed 6％.
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