Fig. 1. Steady-state luminous characteristics measurement device and result under different treatment conditions

Fig. 2. Secondary electron emission coefficient test device and results

Fig. 3. Relationship of Al₂O₃ flashover voltage and the production of pressure and distance^[1]

Fig. 4. Flashover voltages of materials under different voltage wave-forms^[12-14]

Fig. 5. Cylinder polystyrene flashover voltages on different temperature^[15]

Fig. 6. Distribution of equipotential line in CTJ

Fig. 7. Relationship between average surface roughness of different insulators and the flashover voltage ^[24]

Fig. 8. Common insulator surface shapes

Fig. 9. Cylindrical insulator inclination angle vs flashover voltage^[27]

Fig. 10. Schematic diagram of the development process of flashovers along the surface in the SEEA model^[33]

Fig. 11. Schematic of an electron polarization relaxation model^34]

Fig. 12. Insulator flashover electric field with different pre-breakdown time delays^[33]

Fig. 13. Effect of surface charge on the flashover voltage under the pulse voltage

Fig. 14. Influence of surface charge polarity on flashover voltage at DC voltage^[41]

Fig. 15. Three ways of surface charges accumulation