How is the dielectric strength of a transformer tested?

To test the dielectric strength of a transformer, one employs a dielectric testing device, which often includes specialized testers like those from Globecore. The test involves applying a high voltage to the transformer oil while monitoring the breakdown voltage, usually under controlled conditions. This is essential for determining the quality of the insulating oil, as it should withstand a certain voltage without breaking down. The tester typically follows specific standards and protocols to ensure accurate measurements. The results help identify the effectiveness of the transformer insulation and predict potential failures, ensuring safe and efficient transformer operation. Utilizing a reputable dielectric tester assures compliance with industry standards and provides critical diagnostics for transformer maintenance.