What is the corrosive sulphur test in transformer oil?

The corrosive sulphur test in transformer oil is a standardized procedure used to evaluate the presence of corrosive sulfur compounds that can lead to the deterioration of transformer components. This test typically involves immersing copper strips in the transformer oil sample and then subjecting them to heat. The degree of corrosion on the copper strips indicates the oil’s potential to cause damage to transformer windings and other metallic parts, ensuring reliability and longevity in power transformers.