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Insulator pre-discharge flashover effect
- Jun 22, 2018 -

If the discharge during the pre-discharge treatment is strong, unrecoverable damage may occur (such as the formation of discharge channels on the surface of the insulator, localized melting and deformation of the electrode due to severe discharge, etc.). At this time, the effect of pre-discharge treatment is not achieved, but is reduced. The system's surface flashover voltage. Pre-discharge treatment does not require the system to actually discharge. If the insulator in the vacuum is continuously applied with a voltage lower than the flashover voltage along the surface, although the flashover does not occur at the same time, the creeping voltage of the insulation system can also be increased. Experiments have found that if a small voltage is applied before the voltage is applied formally, the flashover voltage on the surface will be greatly affected. Under normal circumstances, if a direct current voltage of the same polarity is applied before the impulse voltage is applied, the flashover voltage can be increased; on the contrary, if a direct current voltage of the opposite polarity is applied, the flashover voltage can be reduced. The duration of this effect is very short, generally within 50μs, and the duration of the action is related to the insulation resistance of the material.