This paper addresses the issue where the proportion of SF6 gas in the gas chamber fails to meet standard requirements during the replenishment of SF6/N2 mixed insulating gas to rated pressure due to overcharging SF6 gas.It researches intelligent replenishment technology applicable to the full ratio range for SF6/N2 mixed insulating gas without power interruption.Building upon normal replenishment requirements

a full-scale intelligent replenishment algorithm based on auxiliary pressure relief is developed

allowing for complete relief of the overcharged SF6 gas before replenishment.In addition

feedback adjustment and mixing modules for the SF6 gas ratio are studied to improve accuracy after replenishment.Finally

an intelligent replenishment system for SF6/N2 mixed insulating gas with auxiliary pressure relief is developed

enabling automatic gas distribution and intelligent replenishment across the full range.Simulation tests show that the deviation of the SF6 gas proportion in the equipment gas chamber replenished by this system is less than ±1%

with a pressure deviation of less than ±0.001 MPa.