AC Flashover Performance and Insulation Coordination of Novel Lightning Protection Composite Insulator

Lightning could lead to insulation failure if there is no protective steps were taken. Typically for this reason a lightning arrester is used. A novel insulator incorporating an arrester and an insulator for 10 kV power lines was designed to integrate the insulator with the lightning arrester as a single entities. This paper aims to study the AC flashover performance and insulation coordination of novel lightning protection composite insulator. The results shows that U _f decreases with the increase of ESDD. Specifically, when ESDD increases from 0.01 mg/cm ² to 0.2 mg/cm ² , U _f decreases from 44.4 kV to 15.1 kV. Thus, the maximum air gap distance to ensure the normal operation of the insulation section is 19 mm, 13mm and 10mm, when ESDD is 0.07mg/cm2, 0.09mg/cm2, 0.11mg/cm2 respectively. This paper presented the insulation coordination of the insulation section, ensuring that the protection gap can work normally.