Fundamentals of Current Interruption in Environmental Friendly High-voltage Vacuum Switches
In response to the development needs of green and environmentally friendly switchgear under the dual-carbon strategy,the vacuum arc extinguishing and clean air insulation solution is a thorough solution for SF6 replacement goal of switchgear.This paper comprehensively analyzes the key issues faced by vacuum switches in the development of higher voltage levels,focusing on the breaking problem of vacuum switches under high voltage and high current.Based on the basic theory of vacuum arc,the post-arc dielectric recovery process is divided into the residual plasma dissipation stage,the metal vapor recovery stage,and the metal droplet and molten contact surface recovery stage,and the recovery characteristics of the vacuum arc chamber electrode gap recovery characteristics in the three stages are compared and analyzed.In response to the demand for the development of environmentally friendly vacuum switch towards higher voltage levels,the key issues of vacuum interrupter insulation design,arc control,X-rays radiation,and current-carrying heating are summarized,and the difficulties and solutions of clean air insulation in practical applications are explained,aiming to provide references for the research and design of vacuum switches with voltage levels of 252 kV and above.Finally,the research status and development trend of high-voltage vacuum switches are discussed.
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