Transformer Testing course – e-lesson #6: Dielectric tests on power transformers
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This is the sixth lesson in a transformer testing course, focusing on the dielectric tests performed on power transformers. The lesson will cover the relevant standards, key definitions, and the specific test requirements outlined in both IEC and IEEE standards. It will explain the importance of properly preparing the transformer before dielectric testing, including the sequence of tests that should be followed. The lesson will provide an overview of the lightning impulse, switching impulse, and various AC tests required to verify the transformer's insulation integrity. Additionally, it will touch on the electric measurements and diagnostic methods used to assess the condition of the transformer's insulation. Finally, the introduction will mention the procedures to be followed in case of a test failure and the insulation tests required for the transformer's auxiliary wiring.
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The sixth lesson of Transformers Testing Course provides an overview of dielectric tests without going into the details of test techniques. The overview lesson organizes the tests according to their standard (IEC and IEEE) requirements and which part of the transformer insulation is tested.
Keywords: power transformers, transformer testing, dielectric tests, insulation tests, high voltage tests
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