Enhancement and Comparison of Nano-ester Insulating Fluids

In this paper, three types of nano particles such as Conductive Nano Particles (CNP), Semiconductive Nano Particles (SNP) and Magnetic Nanoparticles (MNP) were added with natural ester insulating fluids (NEIFs) like sunflower oil (SFO), soya bean oil (SBO), rape seed oil (RSO), rice bran oil (RBO), coconut oil (CO) and cotton seed oil (CSO). These nano particles possess mechanisms like large relaxation time constant, electron scavenging, chain breaking and metal chelation. A standard quantity of natural ester insulating fluid (NEIF) and three different concentrations of nano particles such as 0.05 g/L, 0.25 g/L and 0.5 g/L were blended to form superior nano ester insulating fluid (SNEIF). The NEIFs and SNEIFs were tested against electrical (ac breakdown), physical and thermal properties with the aim of enhancing its base properties. The characteristics of samples were tested before and after modification according to IEC and ASTM standard. It is evident that CNP, SNP and MNP show superior performance at elevated temperature than normal temperature.