The peculiarities of a multilayer insulation electrothermal break-down

Problem of electrothermal breakdown of two-layer thin dielectric insulation used in nuclear energetic units is considered. For some cases analytical expressions connecting parameters on the boundary of the breakdown were derived. It is shown that under distributed sources of the electromotive force the best electric strength characteristics are achieved at the identical current density in both insulation layers of the most stressed section. These conditions are realized by the selection of layers resistances or using accessory shunts including shorting in one of the layers