What is the BDV test of transformer oil?

The BDV test of transformer oil, or Breakdown Voltage test, measures the dielectric strength of the oil. This test determines the voltage at which the oil fails and conducts electricity, indicating its insulating properties. A higher BDV value signifies better insulation quality, which is crucial for the safe operation of power transformers. Regular BDV testing helps in assessing the condition of transformer oil and ensuring reliability in electrical systems.