What is the procedure for dielectric testing of transformer oil?

The procedure for dielectric testing of transformer oil involves several key steps. First, collect a sample of the oil and ensure it is free from contaminants. Next, use a dielectric strength tester to apply a voltage across two electrodes submerged in the oil. Gradually increase the voltage until breakdown occurs, recording the voltage at which this happens. The result indicates the oil’s dielectric strength, which should meet industry standards for safe operation.