Film capacitor has important applications in such fields as DC transmission

rail transit

pulse power device due to its small size

high energy storage density and good safety. The commonly used dielctric material of film capacitor includes biaxially oriented polypropylene (BOPP) films and polyethylene terephthalate (PET) films. In this paper

two types of dielectric films are taken as the research object

the inlfuence of metal layer thickness on the breakdown strength and self-healing performance of the film are studied by vacuum evaporation to prepare metallized films with different square resistance. The metallized film of both polymers is manifested as that reducing the thickness of the metal layer can improve the break-down strength of the film to a certain extent

and the self-healing energy is statistically significant and increases with the increase of voltage

while the self-healing energy of the high square resistance film is smaller and the self-healing performance is better. Repeated self-healing is also observed in the experiment with the occurred cause is explained.