What is the relative saturation of transformer oil?

The relative saturation of transformer oil refers to the amount of water dissolved in the oil compared to the maximum amount of water that the oil can hold at a specific temperature and pressure, usually expressed as a percentage. This measurement is crucial for assessing the condition and reliability of the transformer oil, as excessive water saturation can lead to insulation breakdown, reduced dielectric strength, and increased risk of transformer failure. Monitoring the relative saturation of transformer oil helps ensure that transformers operate efficiently and prevents detrimental effects caused by moisture ingress, ultimately extending the lifespan of the equipment and maintaining system integrity.