Abstract
This paper is aimed at the variation of AC and lightning impulse (LI) breakdown voltages of samples enriched with fullerene (C <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">60</inf> ) nanoparticles (NPs) of natural ester, which stand out as an alternative to mineral oils. C <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">60</inf> nanofluids with long-term stability and good dielectric properties are examined in this study on five samples for concentrations of NPs ranging 0.05 to 0.4 g/L concentrations. The AC and LI breakdown voltage measurements of each sample are repeated thirty times and the conformity of these measurements of the normal distribution is tested with the Shapiro-Wilk test. Conformity of all samples to normal distribution is accepted by this test and withstand voltages are calculated at 1%, 10% and 50% breakdown probabilities. The AC breakdown voltage performances of 0.3 and 0.4 g/L C <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">60</inf> nanofluids are increased compared to natural ester. This increase rate is 5.1% and 7.8%, respectively. The withstand voltages at 1% and 10% breakdown probabilities increase by 20.2% and 13.2% compared to natural ester at 0.4 g/L C <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">60</inf> nanofluid. 0.1 g/L C <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">60</inf> nanofluid has 8.2% better performance than natural ester at LI breakdown voltages. Withstand voltages of 1% and 10% probability of this nanofluid are 6.5% and 7.7% higher than natural ester, respectively. These measurement results show that C <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">60</inf> doped nanofluids can meet performance requirements in power system equipment with high power demands.
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