Investigation on Post-arc Recovery Characteristics of SF6/N2 Mixed Gas Medium

SF6 is a strong greenhouse gas with high liquefaction temperature, which limits its application in gas insulation equipment to a large extent. Therefore, the search for a replaceable gas has become a hot topic in electrical field. Although scholars have carried out a lot of research work on SF6 replacement gas, they have not yet found a gas that can completely replace SF6. At present, the most cost-effective way is to use SF6 gas mixture. Therefore, this paper mainly studies the recovery of insulation strength of SF6/N2 gas mixture with different proportions after a certain arc-burning time. In this experiment, the RC circuit is used to simulate the arc-burning condition. After the arc current transfer, the high-voltage pulse generator is used to apply pulse to the contact gap, so as to obtain the back-arc recovery characteristic curve of the gas medium, which provides data support for the research and development of the circuit breaker replacing SF6 gas, and also has important significance for the study of the breakdown problem of the replacement gas circuit breaker.