Against the backdrop of increasingly stringent global environmental protection requirements, China’s growing electricity demand has made the green transition of power equipment imperative. Traditional high-voltage switchgear widely uses SF6 gas, which has a global warming potential (GWP) 23,500 times higher than CO2, necessitating urgent eco-friendly alternatives. This study explores the application performance of dry air as an SF6 substitute in high-speed grounding switches. By establishing a dry air arc simulation model, developing arc parameter calculation methods, and constructing a high-precision simulation model, the research systematically analyzes the breaking performance after replacing SF6 with dry air. Key parameters such as required air pressure and contact gap for equivalent performance are determined. The findings will provide theoretical foundations and technical support for the eco-friendly transformation of high-voltage switchgear, promoting green and sustainable development in the power industry.