What dissolved gases are found in transformer oil?

Dissolved gases in transformer oil primarily include hydrogen, methane, ethane, ethylene, acetylene, carbon monoxide, carbon dioxide, and various hydrocarbon gases. These gases are mainly products of the thermal decomposition of the oil and insulation materials that can occur due to overheating or electrical arcing in transformers. Monitoring the concentration of these dissolved gases is crucial for identifying potential issues such as insulation failure or thermal degradation, and implementing effective maintenance and regeneration processes can help manage and mitigate risks associated with these dissolved gases in transformer oil.