What is the procedure for transformer oil breakdown test and what parameters are evaluated?

The procedure for a transformer oil breakdown test involves applying a high voltage to a sample of the oil until it fails, indicating its dielectric strength. The test typically uses a standardized setup, such as the ASTM D1816 method. Key parameters evaluated include the breakdown voltage, which indicates the oil’s insulating properties, and the presence of contaminants or moisture, which can affect performance and reliability. Regular testing helps ensure transformer safety and efficiency.