What is the minimum BDV of transformer oil?

The minimum BDV (Breakdown Voltage) of transformer oil is typically set at 30 kV for new oil. This value indicates the oil’s ability to withstand electrical stress without breaking down. Maintaining a BDV above this threshold is crucial for ensuring the reliability and safety of power transformers, as lower BDV values can lead to insulation failure and increased risk of electrical faults. Regular testing is essential for monitoring oil quality.