Join us on 21st May at 2 pm CET for the lesson #3 of the OLTC course!

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This e-lesson focused on reactor-type on-load tap changers, providing an in-depth look at their operating principles, design features, and advantages over resistor-type tap changers. The speaker, Dr. Raha Levi, explained how reactor-type changers can operate in a bridging position, doubling the number of available tap positions. A key benefit of the reactor design is its ability to control load current and prevent damaging circulating short-circuit currents. The presentation covered various switching mechanisms, including arcing tap switches, selector and transfer switches, as well as the use of vacuum interrupters, which offer extended maintenance intervals. Detailed animations and diagrams were used to illustrate the complex switching sequences of reactor-type tap changers. The speaker also discussed testing methods, such as dynamic resistance measurement and vibro-acoustic analysis, that can help detect mechanical issues within the tap changer. Overall, the lesson offered a comprehensive technical overview of this important transformer component and the latest advancements in its design and operation.

Content of this lesson is fully vendor agnostic but it is sponsored by Huaming!