What is the oxidation stability test for transformer oil?

The oxidation stability test for transformer oil evaluates its resistance to oxidation over time, which is crucial for maintaining the oil’s insulating properties and preventing sludge formation. This test typically involves heating the oil in the presence of air and measuring the increase in acidity and the formation of insoluble materials. A higher oxidation stability indicates a longer lifespan for the transformer oil, ensuring reliable performance and reduced maintenance needs in power transformers.