What are the technical aspects of old transformer oil?

Old transformer oil typically exhibits several technical aspects that indicate its degradation. Key factors include increased acidity, which can lead to corrosion, and the presence of moisture, which reduces dielectric strength. Additionally, the oil may contain particulate contaminants and oxidation products, affecting its insulating properties. Regular testing for these parameters is crucial to assess the oil’s condition and determine the need for replacement or treatment to ensure optimal transformer performance.