Influence of Water on Selected Dielectric Properties of Impregnants in the Cured State

Improving the properties of impregnants used for the windings of electric rotating machines and transformers is still an actual problem that is being dealt with by many scientific institutions looking for more efficient and environmentally friendly materials. The goal is not only to increase the reliability and service life of electrical equipment, but also to optimize the production process and material base, which will lead to a reduction in economic costs. Constantly increasing requirements on the properties of impregnants are met either by introducing completely new impregnants or by modifying the original ones. In both cases, it is necessary to test their properties in order to verify the long-term stability and resistance to degradation effects. This paper presents partial results from testing the resistance of three different impregnants in the cured state to water in terms of investigation of selected dielectric properties.