Numerous studies have shown that the pre-discharge process can increase the surface flashover voltage of the system, but this is only for a pre-flashover effect.
For systems that apply voltage immediately after discharge, that is to say, the effect of the effect is limited for a certain period of time. When the insulator is pre-discharged and the flashover voltage of the system stabilizes, if the voltage is applied for a period of time, then the surface flashover voltage of the system will decrease, but it will be higher than the first flashover voltage. It is also easier to reach a stable value during pre-discharge treatment. In addition, if the insulator that has been pre-discharged is exposed to the atmosphere or the degree of vacuum is reduced, and then the degree of vacuum is raised, the same phenomenon occurs. In addition, not all pre-discharge processes can improve the surface flashover voltage of the system.
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