Fig. 1. Basic structure of field-breakdown trigger vacuum switch (left) and surface flashover trigger vacuum switch (right)

Fig. 2. Structure schematic of multi-pole trigger vacuum switch

Fig. 3. Schematic of experimental setup for laser-trigger vacuum switch

Fig. 4. Layout of experimental setup of vacuum switch based on cold cathode material

Fig. 5. Two kinds of cold cathodes and stainless steel anode after experiments

Fig. 6. Micro-structure of velvet before and after breakdown for different magnification times

Fig. 7. Micro-structure of carbon-fiber before and after breakdown for different magnification times

Fig. 8. Comparison of surface elements of stainless steel anode before and after breakdown

Fig. 9. Electron emission mechanism of cold cathode material

Fig. 10. Waveforms of voltage, current and trigger voltage for carbon-fiber cathode

Fig. 11. Conduction time and delay time vs. operation voltage for flashover trigger vacuum switch