Siemens SIMEAS R-PMU Manual page 45

Resampling
The constantly sampled measuring signal (192 sample values per nominal period) will be distrib-
uted based on the reference frequency onto 128 values per measured signal period.
Fast Fourier transformation
Fast Fourier transformation is used to create the phasors of the basic oscillation. All other values
(e. g. effective power, reactive power, positive sequence system, negative sequence system)
are calculated from the basic oscillation. The measured values are also used to derive the trigger
conditions for the Transient Phasor Recorder (TPR).
Digital Fault Recorder, SIMEAS R-PMU, Manual
E50417-H1076-C360-A5, Release 10.2012
6.1 Measured Value Acquisition and Processing
6
45