(Transformer) Dissolve Gas Analysis (DGA) Testing

Since everything inside a power transformer is emerge in oil, which serves as its insulation and cooling medium, every activities or incidents inside the transformer tank leaves a signature or traces in the oil. Such incidents inside the transformer could be a high intensity fault, partial discharges, decomposition of the insulating paper, and/or overheating.

In DGA testing, a gas sample is extracted from the oil and nine key gas components namely: Hydrogen, Oxygen, Nitrogen, Methane, Carbon Monoxide, Carbon Dioxide, Ethane, Ethylene, and Acetylene are analyzed. More information and a tool for analyzing key gasses using IEEE Guide for the Interpretation of Gases Generated in Oil-Immersed Transformers can be found here, http://www.jcmiras.net/surge/p81.htm

Below is a photo on how the oil is extracted from inside the transformer for DGA Testing;