Evolution characteristics of vacuum arc plasma under two types of electrode structures based on the principle of two-colorimetric diagnosis

Le résumé fourni par la source

The diffusion of vacuum arc directly affects the breaking ability of vacuum circuit breaker. The plasma distribution in the arc gap during initial diffusion is the main object to control the vacuum arc. The electrode structure is the main way to control the vacuum plasma by controlling the path of the current, so as to generate different magnetic fields to control the arc movement, development, distribution and extinction. Based on the principle of two-colorimetric diagnosis, the evolution characteristics of plasma under two types of electrode structures are experimentally studied. The 2D dynamic distributions of the plasma in the arcing with the cup-shaped axial magnetic field electrode and the $1 / 2$ turn coil electrode are obtained. The results show that the axial magnetic field intensity directly affects the distribution of cathode spots and plasma jets near the cathode. Compared with the cup-shaped axial magnetic field electrode, the luminance in arc gap presents a certain strip under the coil electrode condition, the overlap degree of the plasma jet decrease, the particle density is more uniform, and the attenuation rate along the radial direction is smaller, and is significantly reduced near the anode. The calculated results are in good agreement with the luminance distribution of spots and arc column.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.