Enhancement of Dielectric Characteristics of Transformer oils with Nanoparticles

摘要

There is a wide range of applications of nanocrystalline manganese nickel ferrites in electrical devices, however, such nanocrystalline compositions are not applied beforehand for enhancing the dielectric withstand voltages of the transformer oils. In this paper, nanofluid for power transformers examined toward enhancing the oil dielectric characteristics. The nanofluid is prepared using the synthesized nanoparticles of manganese nickel ferrite concerning substitution of 20% and through the oxalate precursor route annealed at 1000°C. The nanostructure of Mn_(0.2)Ni_(0.8)Fe_2O_4 is evaluated and verified by the scanning electron microscopy (SEM) and x-ray diffractometer (XRD). Nanofluid dielectric characteristics are examined by applying the standard impulse voltage waveform using pin-hemisphere test cell. Different concentrations of nanocrystalline manganese nickel ferrite in the transformer oils such as 0.02, 0.04, and 0.06 g/l are experimentally tested to ascertain the enhancement of using the proposed nanocrystalline particles. The dielectric withstand voltage is enhanced by around 40% with using the proposed nanocrystalline Mn_(0.2)Ni_(0.8)Fe_2O_4 powder.