Investigation of the Electro Physical Properties of the Components of Modern Paper-Impregnated Insulation

The results of measurements of the mechanical tensile strength, short-term electrical strength, as well as other electro physical characteristics of the components of modern paper-impregnated insulation: electrical insulation paper of various types and some used and promising dielectric liquids are presented. An assessment of the change in the tensile strength during artificial aging of both dry insulating paper and paper aged together with various dielectric liquids is given. Significant differences in the magnitude of the electric field strength at the breakdown, as well as different dynamics of the breakdown development in different types of electrical insulation paper, are noted. Special attention is paid to the measurement of electrical parameters – breakdown voltage, electrical resistance at direct current, the tangent of the dielectric loss angle of mixtures of silicone transformer fluid with petroleum oil. It is shown that colloidal particles formed as a result of the emulsification of silicone liquid in petroleum oil have a strong influence on the parameters of the mixture; and the parameters of the mixtures change over time or after heating, the analysis of the data obtained is carried out, on the basis of which a conclusion is made about the prospects of using modern materials in paper-impregnated insulation.