Study on the Effect of DC Voltage Rise Rate on Surface Flashover Characteristics of Insulation Barrier-LN2-Bubbles Composite Systems

Barrier effect is an effect way to improve the insulation strength of the R-SFCLs. The objective of the paper is to obtain the DC voltage rise rate on surface flashover characteristics of insulation barrier-LN
2
-bubbles composite systems. Three kinds of DC voltage rise rate was applied to the needle-needle-plane electrodes with and without bubbles, respectively. The results show that the DC voltage rise rate increases, the flashover voltage U
f
also increases. And the presence of bubbles significantly reduces the flashover voltage. In the presence of bubbles, when the voltage rise rate is not obviously, the difference in flashover voltage is significant, which is different from the situation without bubbles. The results can be used to design insulation structure of the R-SFCLs.