BDV (Breakdown Voltage) testing of a transformer is conducted to assess the dielectric strength of the insulating oil. This test measures the voltage at which the oil breaks down electrically and allows current to pass through. A high BDV value indicates good insulating properties, while a low value suggests contamination by moisture, dirt, or aging products. The test involves applying an increasing AC voltage across electrodes immersed in the oil until a spark occurs. Regular BDV testing is essential for transformer maintenance, as degraded oil can lead to insulation failure and transformer breakdown. It ensures operational safety and reliability.
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