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Abstract
Dissolved Gas Analysis (DGA) is a widely used technique to estimate the condition of oil-immersed transformers. The experimental results of the level and the change in concentration of different combustible gases in the insulating oil is a trustworthy diagnostic tool which can be used as indicator of undesirable events occurring inside the transformer, such as hot spots, electrical arcing or partial discharge. The objective of this paper is mainly to analyse available data from DGA, and investigate data that may be useful in quantitative modeling of the transformer’s reliability. Dissolved Gas Analysis (DGA) of transformer oil is the best indicator of a transformer’s overall condition. It will provide useful information about the condition of oil and help to identify the type of fault in the transformer