What are the key dissolved gases analyzed in transformer oil?

The key dissolved gases analyzed in transformer oil include hydrogen (H2), methane (CH4), ethane (C2H6), ethylene (C2H4), acetylene (C2H2), carbon monoxide (CO), carbon dioxide (CO2), and oxygen (O2). These gases are critical for assessing the condition of the transformer, as their concentrations can indicate various fault conditions, such as overheating or arcing. Regular analysis helps in predictive maintenance and enhances the reliability of power transformers.