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About This Item


Full Description


This part of IEC 60255 is for synchronized phasor measurement systems in power systems. It defines a synchronized phasor (synchrophasor), frequency, and rate of change of frequency measurements. It describes time tag and synchronization requirements for measurement of all three of these quantities. It specifies methods for evaluating these measurements and requirements for compliance with the standard under both static and dynamic conditions. It defines a phasor measurement unit (PMU), which can be a stand-alone physical unit or a functional unit within another physical unit. This document does not specify hardware, software or a method for computing phasors, frequency, or rate of change of frequency.


Revision Standard - Active.

Document History

  1. IEEE/IEC 60255-118-1-2018


    IEEE/IEC International Standard - Measuring relays and protection equipment - Part 118-1: Synchrophasor for power systems - Measurements

    • Most Recent
  2. IEEE C37.118.1-2011

    IEEE Standard for Synchrophasor Measurements for Power Systems

    • Historical Version
  3. IEEE C37.118-2005

    IEEE Standard for Synchrophasors for Power Systems

    • Historical Version
  4. IEEE 1344-1995

    IEEE Standard for Synchrophasors for Power Systems

    • Historical Version