Breakdown strength of two-layer dielectrics

In paper the experimental results of the breakdown strength study for the two-layer dielectrics under the high electric field are given. The relation between the breakdown strength (E_b) and the boundary position (ξ) between layers for the two-layer dielectrics is anomalous in character. Similar results for the dissipation factor tanδ in low and high field were obtained. We suppose that the discovered changes in E_b and tanδ with the changing ξ are probably caused by the forming peculiarities of the relaxation polarization due to the existence of abrupt step in both the permittivity and conductivity at the boundary between dielectric layers.