Abstract:
In this paper, the electric field, space charge and temperature distributions across a
double layered dielectric are investigated under DC voltage. The dissimilarity of
material properties of different layers, the effect of electric field and temperature
dependent conductivity are found to play critical role in the electro-thermal problem of
multi-dielectrics. At the interface, Maxwell-Wagner polarization is incorporated for
electric field and interfacial charge, while temperature is considered as a continuous
function of space inside the material. The current continuity equation, thermal
continuity equation and Poisson's equation are simultaneously solved using numerical
methods in parallel-plane electrode geometry. The electric field distribution,
temperature distribution, space charge distribution and thermal breakdown limits are
obtained at various boundary temperatures for different thickness proportions of
layers.
