The influence of electric field intensity on the activation energy of the DC conductivity the electrical pressboard of impregnat

In the paper presents the influence of electric field intensity on the activation energy of the DC conductivity the electrical pressboard impregnated with synthetic ester in the measuring temperature range of from 20 °C to 80 °C and the electric field intensity range from 10 kV/m to 1000 kV/m. With Arrhenius plots for pressboard sample about the moisture content 6% wt. and for all of the electric field intensity was determined coefficients of determination R2, which are very close to one. This proves the high accuracy of approximation linear experimental results on the Arrhenius plots and highly accurate measurements of conductivity. It was found that for pressboard sample about the moisture content of 6% wt. impregnated with synthetic ester and the electric field intensity does not affect (in the margin of error) on the activation energy value of the DC conductivity, which is (0.59075±0.01202) eV.