Plasma Characteristics of DC Hydrogen—Nitrogen Mixed Gas Arc Under High Pressure

In this paper, dc arc characteristics in different high pressure gas atmospheres were studied, both in pure N₂ and in mixed gases of 20%N₂ and 80%H₂ at 5 atm. The experiments were conducted in a demountable arc-quenching chamber with double contacts and a transparent glass shield in a 270 V dc circuit. With a high-speed camera, the arc motion is analyzed. The results indicate that H₂ and N₂ mixed gases have better performance for dc arc extinguishing. Images of pure N₂ and 20%N₂-80%H₂ mixed gas dc arc appearances are presented.