Name Type Values (Range) Unit DescriptionFREQREFCHSEL INTEGER - - Frequency referencechannel numberselectedFREQREFCHERR BOOLEAN 0=Freq ref notavailable1=Freq ref error2=Freq refavailable- Frequency referencechannel errorFREQTRIG BOOLEAN - - Frequency triggerDFDTTRIG BOOLEAN - - Rate of change offrequency triggerMAGHIGHTRIG BOOLEAN - - Magnitude high triggerMAGLOWTRIG BOOLEAN - - Magnitude low trigger6.1.3.2 Reporting filters GUID-D39153B5-81CE-4C1F-A816-C7A4C3407048 v2The PMUREPORT function block implements the reporting filters designed toavoid aliasing as the reporting frequency is lower than the sample/calculationfrequency. This means, the synchrophasor and frequency data which are includedin the C37.118 synchrophasor streaming data are filtered in order to suppressaliasing effects, as the rate of the C37.118 data is slower than the data rate forinternal processing. For this purpose, there is an anti-aliasing filter designed foreach reporting rate. The correct anti-aliasing filter will be automatically selectedbased on the reporting rate and the performance class (P/M) settings. The filters aredesigned to attenuate all aliasing frequencies to at least -40 dB (a gain of 0.01) atM class.The synchrophasor measurement is adaptive as it follows thefundamental frequency over a wide range despite the reporting rate.For example, when the synchrophasor measurement follows the fundamentalfrequency beyond the fixed Nyquist limits in C37.118 standard, the anti-aliasingfilter stopband moves with the measured fundamental frequency. This has to beconsidered in connection with C37.118, where the passband is defined relative to afixed nominal frequency as shown in the equation 12.0 2sFf ±IECEQUATION2418 V1 EN-US (Equation 12)where,f0 is the nominal frequencyFs is the reporting rate1MRK 511 407-UEN C Section 6Wide area measurement systemPhasor measurement unit RES670 2.2 IEC 93Application manual
