The presence of ethane in transformer oil typically indicates the occurrence of thermal decomposition or electrical discharges within the transformer. When temperatures rise beyond normal operating levels or when arcing occurs, hydrocarbons in the oil can break down, leading to the formation of light hydrocarbons such as ethane. Therefore, detecting ethane in transformer oil may signify potential issues such as insulation failure or overheating, necessitating further analysis and possible maintenance to ensure the safe operation of the transformer. Regular monitoring of ethane levels in transformer oil is crucial for preventive maintenance and the overall longevity of the equipment.