Positive Pre-breakdown Streamer Propagation and Breakdown Voltage of Palm Oil based Al2O3

This research paper presents the experimental results of the lightning pre-breakdown and breakdown voltages of Palm Oil (PO) and Mineral Oil (MO) in the presence of $Al_{2}O_{3}$ under positive voltage polarity. The experiments were conducted using a needle-plane electrode configuration as a non-uniform field. The positive lightning breakdown voltages of two types of refined, bleached, and deodorized PO with various concentrations of nanofluids were determined. The lightning pre-breakdown was monitored through light signal recordings. The light signal emission increased with the applied voltage for all samples. The presence of $Al_{2}O_{3}$ in both PO and MO increases the positive lightning breakdown voltages.