Paper Title
Investigation of Pre-Breakdown Phenomenon in Nanofluids under DC Voltage

Abstract
This paper presents the investigation on the prebreakdown phenomena in nanofluids using synthetic transformer oils as base oil. The considered nanoparticle is a non-conductive (Al2O3-13nm) with concentration of 0.05 g/L was mixed with synthetic oils using an ultra-sonication device and high-speed mixer, simultaneously. This paper shows the analysis of the initiation threshold voltage of streamers, the associated currents and charges under DC voltage using a point – plane electrode test cell. Keywords - Synthetic Ester, DC Voltage, Nanofluids, Pre-Breakdown, Power Transformer, Breakdown Voltage.