The IEC 61869-1:2023 standard is the essential "product family" document for instrument transformers, providing a unified framework of general requirements for newly manufactured units used in measuring, protection, and control applications.

If you are looking for the actual content of the standard, here are the core areas it governs: Environmental Conditions

  • "IEC 61869-1 PDF"
  • "IEC 61869-1 20xx PDF" (replace 20xx with suspected year)
  • "IEC 61869-1 amendment PDF" or "IEC 61869-1 corrigendum"
  • Add "electronic copy", "official", or "buy" when seeking licensed sources

The PDF version of IEC 61869-1 offers several benefits, including:

If you need to test a CT in a substation, design a VT for a 400kV grid, or commission a protection relay, you need a specific part of the 61869 series.