Transformer testing course – e-lesson #12: Induced voltage test and PD measurement

This chapter of the Transformer testing course contains the most important information about induced voltage testing and partial discharge measurement on power transformers.

This lesson provides an overview of the induced voltage test and partial discharge measurement for power transformers. The induced voltage test verifies the insulation strength within the transformer windings and between phases, while the partial discharge measurement checks for harmful partial discharges. Key standards like IEC 60270 and IEEE C57.12.90 are discussed, outlining the test requirements and procedures. The lesson covers the importance of test frequency, duration, and grounding during the tests. Partial discharge detection systems and calibration methods are explained. Techniques to reduce noise and analyze typical partial discharge patterns are highlighted. Finally, the investigation process for identifying partial discharge defects is summarized.