If you use software like ETAP, DigSILENT, or SAP PM, they occasionally include bundled standards. Check your license agreement.
IEC 61869-1 is titled "Instrument transformers – Part 1: General requirements." It serves as the umbrella standard for the entire family of instrument transformer standards. Its primary function is to define the general definitions, safety requirements, and testing protocols that apply to all specific types of instrument transformers, whether they are inductive, electronic, or optical. iec 618691 pdf best
For engineers and manufacturers, this document is essential because it outlines the fundamental criteria for: If you use software like ETAP , DigSILENT
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