Section 4 of IEC 6021 is crafted to facilitate the selection of tap-changers that comply with the specifications outlined in IEC 6021 4-1, specifically for integration with transformers’ or reactors’ tapped windings. Additionally, it aims to enhance comprehension of the diverse types of tap-changers and the related equipment that are available. This application guide encompasses both on-load tap-changers (including resistor and reactor variants) and off-circuit tap-changers.
