What is the acceptable BDV value for transformer oil?

The acceptable BDV (Breakdown Voltage) value for transformer oil typically ranges from 30 kV to 50 kV for new oil. Values below 30 kV indicate potential contamination or degradation, necessitating further analysis or oil treatment. Regular testing of BDV is crucial for assessing the insulation quality and overall health of the transformer, ensuring reliable operation and preventing failures.