A C breakdown voltage characteristics of synthetic ester based egg shell nano fluids

Abstract

Power transformer play a very important role in the power sector and mineral oil has been used as insulating medium due to its availability and cost. However, it undergoes severe ageing due to the contaminants, oxygen and moisture results in the deterioration of insulating properties. To overcome these, various synthetic liquids were developed, which can withstand severe electrical stresses. Especially, synthetic esters, which are readily biodegradable, superior moisture tolerance, fire safety, and high load capabilities have attracted the utilities to make use of these fluids as an alternate to mineral oil for transformer applications. In recent years, in order to have improved critical parameters and heat transfer characteristics, nanofluids were considered the next generation insulting fluids. In this work, synthetic ester based nanofluids were prepared by employing egg shell nano particles, which would give rise to environmental friendly insulating liquids for the transformer applications. The Synthetic ester based egg shell nano fluids with various weight percent (0.001 to 0.005 wt %) of eggshell nano particles were prepared under ultrasonication. These nano fluids were evaluated for parameters such as AC breakdown voltage (BDV), loss tangent, dielectric permittivity, resistivity, Flash Point and acidity. The AC breakdown voltage (BDV) increased as the weight percent of eggshell nano particles increased. The effect of eggshell nano particles on the critical parameters were studied in detail and the same is discussed in this work.