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The International Electrotechnical Commission (IEC) has published a series of standards for instrument transformers, including IEC 61869-5. This standard specifically deals with the requirements for low-power instrument transformers, which are used to measure electrical quantities such as current and voltage in power systems.
Unfortunately, it's unlikely that you'll find a completely free PDF download of IEC 61869-5. However, you may be able to access a free preview or a draft version of the standard through various online sources. iec 61869-5 pdf free download