Abstract
Characteristics of high-current arc discharge in H2, N2, air and SF6 have been investigated to develop a high-efficiency, high-repetition pulse power switch. The discharge parameter was typically 5–50 kV, 12–16 kA, with pulse duration around 600 ns. Energy transfer efficiencies and the recovery characteristics of breakdown voltage have been evaluated using a charge transfer circuit. The energy transfer efficiency was found to be much higher for H2. The recovery times required to obtain 50% of initial breakdown voltage are evaluated to be 0.5 ms, 2 ms, and 3 ms for H2, SF6 and air, respectively. The arc column was observed to expand with a supersonic velocity which produced a strong shock wave. The volume of hot gas remaining after the discharge was found to be much smaller for H2, as compared with SF6.
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