Evaluating methyl ester from used cooking oil as liquid insulation with solid insulation for transformers
摘要
The growing environmental hazards resulting from petroleum-based transformer oils provide just the impetus for sustainable biological alternatives. Within the context of this sustainable biorefining, this study demonstrates that there is definitely feasibility to use alternative liquid insulation in transformers in the place of cooking oil methyl ester. With an abundance and cost-effectiveness factor, such as UCO, it was important to study its suitability in transformer insulation applications. UCO-ME was synthesized using the catalytic transesterification process by the reaction of potassium hydroxide with methanol. International standards were checked for the performance of the UCO-ME. The results obtained show that UCO-ME has a great improvement as compared to the conventional transformer oil (TO). The viscosity decreased by 89.05%, flash point fell by about 7.27%, pour point declined by 33.33%, density fell by about 2.17%, acidity reduced by 98.58%, moisture fell by 85.52%, and the breakdown voltage increased by 80%. Also, visual inspection and ATR-FTIR spectral analysis confirmed that the transesterification process had been fully accomplished. After the improvement of these qualities, research moved on to their compatibility with a solid insulation like UTKPI and NG910PI which is Grade 910 paper insulation for a solid insulation. A compatibility assessment of solid insulation is done by SEM imaging with compression tests and tensile strength tests as well as visual inspection. In addition, acid number and dissolution products of dissociation were evaluated together with UV spectral analysis on undergoing 144-h thermal growth at 120 °C. The outcomes of these experiments indicate that UCO-ME can be used effectively in transformers through the use of solid insulating materials. The study hence shifts attention toward UCO-ME as a green alternative for the power industry by pulling out potential from the application of bio-treatment in transformer insulation.