DGA Interpretation for Increasing the Percent of Accuracy by Different Methods: A Review

Dissolved gas analysis is a method of estimating the presence of dissolved gases in transformer oil. The health of transformer majorly depends on the condition of transformer oil. The percentage of gases in oil may lead to different faults on transformer. Various methods are used to analyze the faults in transformer like Rogers Ratio Method (RRM), Doernenburgs Ratio Method (DRM), Duval Triangle Method (DTM), Duval Pentagon Method (DPM), and IEC Ratio Method (IRM). Various gases are evolved in transformer. The amount of gases liberated in transformer oil produces different faults. In transformer oil, usually the gases which are evolved are hydrogen (H2), methane (CH2), ethylene (C2H4), acetylene (C2H3), carbon monoxide (CO), carbon dioxide (CO2), nitrogen (N2) and oxygen (O2). This paper proposes DGA interpretation for increasing the percent of accuracy by Bayesian network.