International Journal of Engineering and Information Systems (IJEAIS)   Year: 2021 | Volume: 5 | Issue: 10 | Page No.: 58-62 Dissolved Gas Analysis (DGA) Testing For Transformer Health Monitoring 60 MVA 150kV / 20kV GIS M Somantri, Muhammad Arfan, JS Lumbantobing Abstract: The power transmission system is a system that functions to transmit electricity from the generator to the main power substation. This system requires much equipment that supports its effectiveness. One of the equipments that can be categorized as the main component that is considered very important in electric current transmission activities is a transformer. The transformer is a device that functions to increase or decrease the voltage in electric current transmission activities. The condition of the transformer itself can influence the value of the reliability of a transformer. Therefore, it is necessary to carry out routine maintenance of the transformer to have excellent performance. Transformer maintenance can be done by monitoring the health of the transformer insulation oil. This insulating oil acts as an insulator to prevent flashovers. Dissolved Gas Analysis (DGA) is a method that serves to monitor transformer insulation oil. In this method the gases dissolved in the oil will be detected and the results of the analysis of the dissolved gases will be a picture of the health of the transformer oil.