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Insulation is very important for electrical equipment especially in power grid. Insulation failures cause short-circuits and damage equipment. Also insulation fails can create danger for human life. So it is important to know dielectric behaviors in different operation conditions. Ideally a solid dielectric can be represented with a capacitor but practically every dielectric have losses and that loss is represented with a parallel or series resistance. Fundamental parameters of a dielectric are permittivity, loss factor, dissipation factor, capacitor value, resistance and power loss. Common seen problems with solid dielectrics are breakdown, partial discharge and various physical decays. In this paper, effects of frequency to dielectric parameters and problems are investigated theoretically with models and existing works in literature. After that dielectric analysis methods are studied and experiments are done for polyurethane at 50 Hz-400 Hz frequency range. Results are given with graphics and effects of frequency are explained. At high frequencies, the dielectric characteristics can be perishable.

Analysis of Dielectric Properties of Polyurethane Between 50 Hz and 400 Hz Frequencies