What does high ethane in transformer oil indicate?

High ethane in transformer oil typically indicates decomposition or thermal breakdown of the oil, often due to overheating or insulation failure. It may suggest that the oil is undergoing chemical changes, leading to the formation of gaseous byproducts like ethane, which can compromise the insulating properties of the transformer oil. Therefore, monitoring ethane levels is crucial for assessing the health of the transformer and preventing potential failures in the electrical system. Regular analysis and maintenance may be necessary to ensure optimal performance and longevity of the transformer, thereby safeguarding against further degradation of the transformer oil quality.