Abstract
This article describes the influence of thermal and dielectric properties of materials to properties of electrical insulating systems
in high voltage electrical equipment. The aim of this experiment is to improve the thermal and dielectric properties of electrical
insulating (composite) materials using micro fillers of aluminium oxide Al2O3. Supplement of fillers of aluminium oxide with
better thermal conductivity to the electrical insulating systems can be modified to increase their thermal conductivity. Improving
the thermal conductivity of electric insulation by addition of micro- or nanofillers and in the same time not adversely affecting the
dielectric properties is the objective of the study. Paper is presenting the results measured on prepared samples. Improved thermal
conductivity is compared with other dielectric properties as: dissipation factor temperature dependences, resistivity and dielectric
spectroscopy. To determine the dielectric insulating properties the following characteristics were measured: tanδ versus temperature
from 110°C to 150°C, absorption and resorption currents, volume resistivity. Furthermore, this article describes analysis of moisture
and conductivity the material by dielectric spectroscopy.
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