An Effect on Form Particle Contamination in Biodegradable Transformer Oil

Nowadays, power transformer is most crucial electrical equipment in a power system. Researcher has been emphasized a lot of researches on natural ester oils to replace mineral oil that act as insulating liquid in power transformer. In this paper, an effort has been made to investigate corn oil (CO) as alternate liquid insulation to mineral oil (MO). Copper are used as particles contamination in this project. There are 12 oil samples has been prepared. Two samples which are pure MO and pure CO for before aging and 10 oil samples which are five samples of pure MO and five samples of pure CO for after aging. The particles contamination that used in this experiment which is copper with different size of length was added in each sample for after aging. The length sizes of copper were 5cm, 10cm, 15 cm, 20cm, 25cm and 30cm. In this report, the investigation of AC breakdown voltage involved two stages which are before aging and after aging. For before aging, two oil samples are only conducting AC breakdown voltage. Moreover, for after aging another 10 sample has been heated in the oven with temperature 115°C at 96 hours in order to investigate the effect of particle contamination in the transformer oil. From the experiment result that conducted, pure CO higher value of AC breakdown voltage than pure MO for before aging. But, after aging process, the value of pure MO with difference size of copper is higher than pure CO. It show that CO is good oil insulator to replaced MO for the future, but for use in long term, MO still the best insulator because has higher AC breakdown voltage than CO after aging process.