What does the presence of oxygen in transformer oil indicate?

The presence of oxygen in transformer oil typically indicates potential degradation or oxidation of the oil. Oxygen can react with the oil’s hydrocarbons, leading to the formation of acids, sludge, and other detrimental byproducts that compromise its insulating properties and overall performance. This oxidation process may result in decreased thermal conductivity, increased viscosity, and reduced lifespan of the transformer. Effective maintenance practices, including regular testing and monitoring, are essential to detect oxygen levels and mitigate any negative effects. Additionally, oxygen ingress might happen due to leaks or inadequate sealing, highlighting the importance of maintaining the integrity of the transformer system, ensuring optimal operation, and exploring other uses of transformer oil, such as in heat transfer applications or as a dielectric fluid in various electrical devices.