Electric breakdown model for dielectric strength of 10 μm level polyester foil

Numerical analysis was carried out based on the intrinsic breakdown model and the electro-mechanical breakdown model. The self-breakdown voltage characteristic of the polyester foil was measured in a plane-plane electrode arrangement with DC voltage. The thickness of the polyester foil varied among 9, 12, 15 and 18 μm. Experimental results show the average strength of the polyester foil. The comparison between the theoretical analysis and the experimental results was presented. The results show that the critical breakdown strength of the polyester foil in the intrinsic breakdown model is far lower than the experimental results, and the critical breakdown strength of the polyester foil in the electro-mechanical breakdown model is higher than the experimental data of the polyester foil.