The most significant recent paper on this topic is the 2025 study titled "Operating Properties of the Inductive Current Transformer and Evaluation of Requirements for Its Compliance with the IEC 61869-1 WB2 Class Extension for Frequency up to 20 kHz". Summary of the Paper
IEC 61869-1 is a standard for instrument transformers, which are used to measure electrical currents and voltages in power systems. The standard replaces the older IEC 60044-1 and IEC 60044-2 standards. iec 618691 pdf hot
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