Abstract:Making an theoretical analysis of the sudden change arising from the momentary instability in the process of corona charge and discussing the mechanism of the sudden change in the voltage-ampere property of corona charge, describing the process with easy-to-understand electrical mold and proving, through the analysis, that the sudden change is itself a natural property of corona charge in that the current increases suddenly when the voltage decreases, thus causing the sudden change. It is found that the instable start (ignition) voltage is related to the structure and the size of electrode as well as to the physical property of liquid electric inductivity. The findings both theoretically and experimentally reveal that there exists a linear relation between the droplet charging amount in the corona-charging processes and the charging voltage.