Experimental Study on the Effect of Natural Oils Waste on Transformer Insulating Oils
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Abstract
The present work examined the influence of two dissimilar waste natural insulating oils (waste sunflower oil and waste corn oil) on the features of mineral transformer oil manufactured by Al-Dora refinery in Iraq. The primary goal is to place these two oils in the samecontext; thus, a fair compare can be made. In addition to making the mineral oil more sustainable and improving its qualities by substituting it with waste natural ester oils, the waste was produced under controlled conditions by frying sunflower and corn oils (separately) for 20 minutes at temperatures ranging from 100 to 250 °C.This was accomplished by pre-treating the (DO & WNEOs) to remove the maximum amount of water, and then adding the waste natural oils across a wide range of volume percent (20%, 40%, 60% & 80%).The electrical, physical & chemical qualities were among the essential characteristics that were noted throughout the range under study. It's interesting to note that the results showed that both oils might significantly enhance the mineral oil, mainly when concentrated at 20% of WSO/WCO. As the concentration of both WSO and WCO increased, the breakdown voltage started to decrease slightly. However, the breakdown performances of WSO or WCO are above the standard value over the examined range. The flash point was also maintained higher than the standard values throughout the entire range for both oils. While on the drawbacks, the viscosity & acidity weremore significant than the standard values at 20%, which was the ideal percentage that provided the best balance among the evaluated qualities. Finally, a modification of waste oils was carried out through a trans-esterification process to reduce the viscosity effect of sunflower and corn oils on Al-Dora oil. This modification was applied only to the blend consisting of 20% waste oil and 80% Al-Dora oil. The results demonstrated a significant improvement in blend viscosity without adversely affecting the other properties. All in all, it is anticipated that the utilization of waste lubricants could be a promising approach to enhance the characteristics of mineral oil utilized in high-voltage equipment, like transformers.
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