What are the combustible gases present in transformer oil?

The combustible gases present in transformer oil include hydrogen, methane, ethane, ethylene, acetylene, and carbon monoxide. These gases can be generated due to thermal decomposition, arcing, or insulation breakdown within the transformer. Monitoring the concentration of these combustible gases is crucial for assessing the health of the transformer and preventing potential failures or explosions, as they can indicate underlying issues in the transformer oil’s condition.