Research on Vacuum Arc Characteristics of a New Electrode Structure Applied in High Voltage Vacuum Interrupter

In this paper the arc modes transition of the AMF electrode with one-turn coil structure is investigated at gap distance 10mm and 40mm respectively. And the axial magnetic field distribution is computed at 10mm and 40mm. High-speed video recording was used as a major diagnostics to investigate the arc behavior. At gap distance 10mm, the vacuum arc maintains diffuse arc mode. With the gap distance increasing from 10mm to 40mm, the vacuum arc experience constricted arc modes only in short time at beginning. In most of time, the vacuum arc keeps in diffuse arc mode. The test results prove that the AMF electrode with one-turn coil structure is feasible to be applied in high voltage interrupter