Speaker
Description
Transformers are one of the significant parts of the electrical power system. As the power
transmission system is opting for high voltage high power transmission, high performance
insulating materials are drawing attention of the electrical power industry. Nanofluids, formed
by adding nanoscale particles to insulating oil, are stable and homogeneous suspensions that
present advanced performance of electrical insulation and heat dissipation. Transformer oil-
based ferrofluids with Mn-Zn ferrite nanoparticles have been characterized at different
concentrations of particles. The dielectric-spectroscopy experiments were performed on the
LCR meter in the frequency range up to 2 MHz for different AC and BC voltage. We
demonstrate changes in the observed relaxation process by applying electric field with
different intensity. Dielectric dissipation factor of ferrofluids samples was also compared. The
low-frequency relaxation process features observed in experiments was assigned to the
electric double layer polarization. How to reduce the negative effect of nanoparticles on
dielectric loss of nanofluids, needs to be investigated further.
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