Experimental research on the arcing characteristics of C 4 F 7 N/CO 2 gas mixtures

C4F7N-CO2 mixed gas as the potential substitute for SF6 has attracted more and more attention, so it is of great significance to study the arcing characteristics. In this paper, a set of experimental device was designed to study the arcing characteristics of 5%C4F7N/95%CO2sub> and 10%C4F7N/90%CO2. The arc images are captured by high-speed camera to visualize the motion characteristics of arc breaking process, and compared with SF6 gas under the same charging current and gas pressure conditions. The experimental results shown that: with the increase of pressure, the arc voltage increases, which can promote the arc extinguishing performance; The arc conductance of SF6 gas is the largest, and the fluctuation range of arc diameter of 10%C4F7N/90%CO2 is relatively smaller, with the average diameter of 5.5mm; With the increase of C4F7N content, the arc stability is improved, the arc voltage and arc conductance are close to SF6, and the arc extinguishing ability is enhanced.