How is the dielectric strength of transformer oil tested in experiments?

To test the dielectric strength of transformer oil, a standard laboratory procedure is implemented using a dielectric strength tester, typically designed to measure breakdown voltage. A specific sample of the oil is placed between two electrodes in a controlled environment, ensuring the oil is free from contaminants and bubbles. The tester applies a steadily increasing voltage across the electrodes until breakdown occurs, indicating the dielectric strength. The results are usually reported in kilovolts per millimeter (kV/mm) of oil thickness, which provides crucial information about the oil’s insulating properties. Regular testing of dielectric strength is essential for ensuring the reliability and safety of transformer operations and preventing electrical failures.