The Impact of the Use of Dry Lubricating Compound on the Dielectric Properties of Solid and Liquid Insulation of a Power Transformer

This paper discusses the impact of the use of dry lubricating compound during the manufacturing of a power transformer on the dielectric properties of the solid and liquid insulation. Change in dielectric properties noticed in specific cases are discussed. An experimental set up was used for the research work. The experimental set up and basis for simulating the operating conditions and the impact of the use of dry lubricating compound on the solid and liquid insulation of the transformer are discussed. The test results of the experiment indicate that the dielectric properties namely surface conductivity and DC resistivity of the solid insulation can be affected. This can be measured using the capacitance and power factor test. Manufacturers often study the compatibility of the compound with liquid insulation (mineral oil) only and seldom on the solid insulation. The results suggest that the manufacturers should study the impact of the compounds on the solid insulation as well and not only on liquid insulation.