Fig. 1. Specimen of the basin insulator materials

Fig. 2. Schematic cross-section of the basin-shaped insulator sample and electrode structure

Fig. 3. Schematic diagram of the experimental platform

Fig. 4. Full-wave pulse voltage waveforms of the three leading edges on the insulator sample

Fig. 5. Schematic diagram of the structure of the insulator switch used together

Fig. 6. Voltage waveforms of the three frontiers on the insulator sample

Fig. 7. Typical flashover voltage and current waveform

Fig. 8. Flashover voltages of basin-shaped and disc-shaped insulator samples under three full-wave pulse voltages

Fig. 9. Cloud diagram of electric field distribution of basin-shaped and disc-shaped insulator samples

Fig. 10. Electric field distribution along the plane of the insulator sample in the tangential and normal directions

Fig. 11. Comparison of flashover voltage before and after electric field improvement of basin-shaped insulators

Fig. 12. Relationship between flashover voltage and waveform front time of basin-shaped insulators

Fig. 13. Comparison of flashover voltages of basin-shaped insulators under pulsed full-wave and pulsed frontier voltages