Masa pakai transformator dan peralatannya sangat tergantung pada kualitas sistem isolasi. Insulasi merupakan salah satu komponen penting dalam transformator karena pada umumnya insulasi menggunakan insulasi cair dan padat sesuai dengan fungsinya sebagai bahan insulasi dan media pendingin. Pada saat itu digunakan transformator penuaan minyak dan kerusakan yang disebabkan oleh beberapa hal seperti kotoran, kadar air, gas terlarut (Dissolved Gas Analysis-DGA), keasaman dan pemanasan minyak. Pemuatan transformer akan menyebabkan penurunan kualitas sistem isolasi transformer yang mengakibatkan berkurangnya usia minyak isolasi. Pada kesempatan ini penulis akan menganalisa kandungan gas terlarut (DGA) pada transformator dengan menggunakan empat metode yaitu: Duval Triangle Method (DTM), Key Gas Method (KGM), Rogers Ratio Method (RRM), dan Total Combustible Gas (TDCG)
The lifetime of transformers and its equipments are highly dependent on the quality of insulation system.
Insulation is one important component in a transformer because generally, insulations used liquid and solid
insulation in accordance with its function as an insulating material and cooling media. At the time there used
transformer oil aging and damage caused by several things such as impurities, water content, dissolved gases
(Dissolved Gas Analysis-DGA), acidity and heating the oil. Transformers loading will cause a decrease in the
quality of the transformers insulation system that resulted in the decreasing age of insulating oil.
This paper explained the influence of aging on the rate of degradation of Dissolved Gases of power transformers
insulating oil. This research was conducted using sample data loading and maintenance of transformers by
obtained directly with investigations into the transformers which is operating. There are three method to
determine quality of oil transformer i.e. Total Combustible Gases (TCG), Roger Ratio, Key Gas and Duval
Triangle Methods.
Based on analysis result by using samples from a variety of loading conditions of the transformers with different
levels we can conclude the quality and worthiness of insulation oil and the estimated the effective remaining life
of transformers insulation system.
Key words : aging, insulation oil, DGA.
The lifetime of transformers and its equipments are highly dependent on the quality of insulation system.
Insulation is one important component in a transformer because generally, insulations used liquid and solid
insulation in accordance with its function as an insulating material and cooling media. At the time there used
transformer oil aging and damage caused by several things such as impurities, water content, dissolved gases
(Dissolved Gas Analysis-DGA), acidity and heating the oil. Transformers loading will cause a decrease in the
quality of the transformers insulation system that resulted in the decreasing age of insulating oil.
This paper explained the influence of aging on the rate of degradation of Dissolved Gases of power transformers
insulating oil. This research was conducted using sample data loading and maintenance of transformers by
obtained directly with investigations into the transformers which is operating. There are three method to
determine quality of oil transformer i.e. Total Combustible Gases (TCG), Roger Ratio, Key Gas and Duval
Triangle Methods.
Based on analysis result by using samples from a variety of loading conditions of the transformers with different
levels we can conclude the quality and worthiness of insulation oil and the estimated the effective remaining life
of transformers insulation system.
Key words : aging, insulation oil, DGA.

Kata kunci : Transformator, DGA, DTM,KGM,RRM,TDCG