Feasibility Study on the Use of Vegetable Oil (Natural Ester) in Malaysia Power System Transformers

Power transformer insulation oil is critical to the useful life of the transformer. Although mineral base insulation oil is the most common type of transformer insulation oil in use, environmental and safety concerns has encouraged the development of biodegradable alternatives. Today, Envirotemp (R) FR3 (TM) is in commercial use and this study is aimed at ascertaining the possibility of applying the oil in Malaysia power transformers. A sample of Envirotemp (R) FR3 (TM) was tested to measure and compare the technical (including electrical, chemical and physical) properties of the oil according to Malaysian standards. The study found that the oil sample had better qualities, such as higher dielectric strength, lower dissipation factor, higher flash and fire points, higher moisture absorption capability, and less dissolved gases composition amongst others. However, it was also ascertained that further development in this area could be hindered due to Malaysia's lack of standards for biodegradable oil.