Optimization of Filler Loading of Multi-Particle Mineral Oil Nanofluid for Transformer Insulation

Abstract

Transformers are critical components of electric power transmission and distribution system. Mineral oil (MO) based multi-particle nanofluid (MPNF) were prepared with an intention to enhance electrical properties of MO by incorporating $A1_{2}O_{3}$ and TiO2 nanoparticles. Filler loading concentration and mixing ratio, which is the ratio between $A1_{2}O_{3}$ and TiO2 nanoparticle content is optimized by analyzing the simulation results. AC breakdown strength of the prepared samples were measured. It is found that, MPNF sample having a filler loading concentration of 0.1weight percentage (wt%) and mixing ratio of 9:1 shows highest AC breakdown strength. This sample shows an enhancement of 38.4%, 15.86%, and 17.41%, w.r.t pure oil, $A1_{2}O_{3}$ and TiO2 NFs having same filler loading concentration.