As of October 1, 1997, IEC 60606 was officially by IEC 60076-8:1997 . If you are looking for the most current "Application Guide for Power Transformers," you should consult the 60076-8 document. Key Differences in the Successor (IEC 60076-8)
Guidelines for selecting the correct tap-changer settings to manage voltage regulation. iec 60606 pdf
The standard, officially known as the "Application Guide for Power Transformers," is a legacy technical document originally published in 1978 to assist in the selection and application of power transformers. While it has since been replaced by the more modern IEC 60076-8:1997 , it remains a critical historical reference for engineers managing older power infrastructure. As of October 1, 1997, IEC 60606 was
Calculations for in specific connection types (e.g., YNynd). The standard, officially known as the "Application Guide
You can still find the IEC 60606:1978 listing, though it is marked as replaced.
Because IEC 60606 is an older, replaced standard, accessing a PDF copy often requires looking into historical archives or specific standards repositories: