Estimating the energy performance of an insulator with regard to the relaxation time distribution

The energy relationships in the macroscopic electrodynamics of an insulator are analyzed with regard to the polarization relaxation time distribution. Expressions for the discharge power and discharge energy flux densities in an insulator are derived for an electric field exponentially depending on time. The performance of polyethylene terephthalate in capacitive energy storage systems is estimated in terms of energy.