This standard defines synchronized phasor and frequency measurements in substations along with methods and requirements for measurement verification. Measurements compliant with the standard and taken at various locations in the power system can be readily and accurately combined for power system analysis and operations. Time tag and other essential associations are also described to facilitate communication and reliable data application. Communication and recording of phasor measurements are covered in other standards, such as the companion standard IEEE Std C37.118.2-2011.This amendment will correct errors in some performance requirements in Tables 3, 4, 6, 7, 8, 9, & 11 and the associated text. Typographical errors in Section 4.3 will be corrected. The testing methods for OOB signals in Table 3 may be modified. The instructions for testing in 5.5.9 will be clarified. Annex C may be modified to keep it consistent with the rest of the document.
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