Understanding the Lightning Impulse Breakdown Strength of Carbon Quantum Dots Modified Silica Nano-Fluids

Abstract

The study provides an understanding about lightning impulse characteristics of mineral oil used in transformers and other high voltage applications. The withstand capabilities of mineral oil is studied under different experimental conditions such as varying electrode gap distance, electrode type, type of nanofiller and concentration of fillers. Experiments are conducted for electrode gaps of 5mm and 10mm. Different electrode configurations such as needle sphere and needle plane electrodes are used. Nanofillers such as SiO2 and Carbon Quantum Dots treated SiO2 nanoparticles are used in various concentrations such as 0.01%wt. 0.05%wt and 0.1%wt of mineral oil. Comparison is done for positive and negative polarities of lightning impulse test voltages. Experimental results are shown to understand the influence of nanoparticles to deliver better results in impulse withstand capabilities of commercially used mineral oil with improved performance in lightning impulse withstand strength.