Insulation levels, rated frequency (15 Hz to 400 Hz), and accuracy classes.
Older versions or summary documents may be found on community platforms like ResearchGate Regional Adoptions: iec 61869-1 pdf free download
The official standard is a copyrighted document and is typically not available for free download legally from official sources like the International Electrotechnical Commission (IEC) or authorized distributors. Insulation levels, rated frequency (15 Hz to 400
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The most significant feature of IEC 61869-1 is its role as the for all instrument transformers.
IEC 61869-1: Instrument transformers – Part 1: General requirements