IEC/IEEE 61850-9-3:2016(E) specifies a precision time protocol (PTP) profile of IEC 61588:2009 / IEEE Std 1588-2008 applicable to power utility automation, which allows compliance with the highest synchronization classes of IEC 61850-5 and IEC 61869-9.
IEC /IEEE 61850-9-3 Ed. 1.0 en:2016
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Communication networks and systems for power utility automation – Part 9-3: Precision time protocol profile for power utility automation