13. Potassium Hydroxide liquid
14. Distilled liquid
Methodology and Testing Procedures
The research began with the study of literature, namely learning through journals nationally and internationally who have similar case studies, as well as through the Internet and books that can be used as a reference in the research. The preparation stage is the process of finding sources of data which if the information can be useful for the further research. The information is obtained from transformer oil data PLN which serve as a reference in conducting research. Additionally specification power transformer is also required in the present study. Then, samples of oil to be used as the test material was also requested from PLN according to the testing requirements.