: Merges with the former IEC 61869-6:2016 and introduces new testing classifications (type, routine, and special tests).
If you clarify which of IEC 61869 and what "deep feature" (e.g., transient performance, digital output, accuracy class X, PX, TPY, or LPIT) you need, I can point you directly to the best technical guide or paper. iec 618691 pdf best
The most relevant and "best" text regarding refers to the latest edition, IEC 61869-1:2023 , which is the international standard for the general requirements of instrument transformers . : Merges with the former IEC 61869-6:2016 and
...you cannot design a compliant system without the correct 61869 PDF. accuracy class X