BDV (Breakdown Voltage) testing of a transformer assesses the dielectric strength of its insulating oil. This test involves applying an increasing voltage to a sample of transformer oil until electrical breakdown occurs, indicating the voltage level at which the oil fails to insulate. A high BDV value reflects good insulating properties, while a low value suggests contamination with moisture, dirt, or other impurities. Regular BDV testing is essential for monitoring the condition of transformer oil, ensuring reliable insulation, and preventing internal arcing or failure. It’s a standard maintenance procedure that helps maintain transformer safety, performance, and prolongs operational life.
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