Flashover performance of angled insulator with laser illumination under pulsed voltage

An experiment platform of laser illumination together with pulsed voltage excitation was built. The vacuum surface flashover performance of an angled-insulator was studied. The results show that the performance of +45 insulator is better than that of －45 insulator when UV laser (266 nm) or visible laser (532 nm) illuminates at either the cathode triple point or the sample center. The effect of the UV laser illumination on the cathode triple point is prominent, and it is important to shield this area against UV light in the design of vacuum insulators.