Study on the Vacuum Surface Flashover Characteristics of Epoxy Composites with Different Fillers under Steep High-Voltage Impulse

The research on vacuum surface flashover mechanism of insulating material under steep high voltage impulse is important for the design and manufacture of high power pulse generator. This report studies the vacuum surface flashover characteristic of epoxy composite material with different fillers is studied. Generally, various kinds of micron-sized inorganic fillers are utilized to promote different properties (such as reinforcement, arc resistance and fire retardant etc.) of epoxy composite. In this report, comparison study is carried out on the epoxy composites with different kinds of micron-fillers, such as Al2O3, Al2O3·3H2O (ATH), TiO2, BaTiO3 and the oxide films of Al2O3 and TiO2. By using two single-pulse generators (rise time and the half-height pulse width time are 50ns/600ns and 65ns/600ns, and 10¿4Pa ultimate vacuum level), the flashover characteristics of these samples are measured, and the effects of different weight proportion of ATH powder and different kinds of micro-fillers are also analyzed.