What do different gases in transformer oil indicate?

Different gases in transformer oil indicate various issues within the transformer. For instance, the presence of hydrogen suggests overheating or arcing, while acetylene indicates severe arcing or insulation failure. Carbon monoxide can point to thermal degradation of insulation, and ethylene may signify overheating. Monitoring these gases through dissolved gas analysis (DGA) helps in diagnosing potential faults, allowing for timely maintenance and preventing catastrophic failures in power transformers.