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This research was partially supported by the Polish Ministry of
Science and Higher Education as a science fund of the Lublin
University of Technology, at the Faculty of Electrical Engineering
and Computer Science, FN-28/E/EE/2019 – Researches of electrical,
magnetic, thermal and mechanical properties of modern electrotechnical and electronic materials, including nanomaterials and diagnostic of electrical devices and their components.
The paper investigated the influence of temperature on the frequency dependence of the conductivity of cellulose-ester insulation of power transformers containing nano-drops of water.
It was observed that in the insulation containing nano-drops of water on the σ(f) dependence two sections of conductivity increase occur. It was found that the state of the frequency dependence of conductivity is affected simultaneously by the temperature dependence of conductivity and the temperature dependence of dipole relaxation time.
Activation energies for conductivity and relaxation times were determined, the values of which are the same for both stages of the conductivity increase. This means that the structure of water nanoparticles, between which electrons tunnel, is the same for both stages of σ(f) growth. The occurrence of the two growth stages on the frequency dependence of conductivity is associated with differences in distances between adjacent nanoparticles and the associated relaxation times.