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

In experiments, the dielectric strength of transformer oil is typically tested using a flash test or breakdown voltage test, where a standard tester like the Globecore oil tester is utilized. The oil sample is placed between two electrodes under controlled conditions, and a voltage is gradually applied. The moment the dielectric breakdown occurs, indicated by a spark or flashover, the voltage level is recorded. This value is compared to established standards to assess the oil’s insulating properties. The test is crucial for ensuring the reliability and safety of transformers, as it helps determine whether the oil can effectively act as an insulator under operating conditions. Regular testing of dielectric strength of transformer oil is essential to maintain optimal performance and prevent failures in electrical systems.