IEEE Std C37.118.1 pdf free download
IEEE Std C37.118.1 pdf free download.Synchrophasor Measurements for Power Systems.
2. Normative references
The following rcfcrcnccd documents arc indispensable for the application of this document (i.e., thcy must be understood and used, so each referenced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies.
IEEE Std 754TMl985, IEEE Standard for Binary Floating-Point Arithmetic.2
3. Definitions, acronyms, and abbreviations
For the purposes of this document, the following terms and definitions apply. The IEEE Standards Dictionan’: Glossary of Te’r,ns & De/initions [B2] should be consulted fbr terms not defined in this clause.4
3.1 Definitions
anti-aliasing: The process of filtering a signal before sampling to remove components of that signal whose frequency is equal to or greater than the Nyquist frequency (one-half the sample rate). If not removed, these signal components would appear as a lower frequency component (an alias).
(‘oordinated Uni’ersaI Time (UTC): (Initials arc ordered based on French language.) The time of day at the Earth’s prime meridian (00 longitude). It is distributed by various media, including the Global Positioning System (GPS) system.
data concentrator (DC): A device that combines data from several measurement devices.
frequency error (FE): The measure of error between the theoretical frequency and the measured frequency for the given instant of time.
Global Positioning System (GPS): A U.S. Department of Defense (DoD) navigation system that uses a constellation of 24 satellites broadcasting a precision signal for location and time synchronization. Basic time synchronization accuracy is ± 0.2 microseconds (is).
IEEE floating point: A 32-bit representation of a real number.
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NOTE—This definition is in accordance with IEEE Std 754-1985.
leap second: A positive or negative one-second adjustment to the Coordinated Universal Time (UTC) that keeps it close to mean solar time.
Nyquist frequency: A frequency that is one-half the sampling frequency of a discrete signal processing system.
Nvquist rate: A sampling rate that is twice the bandwidth of a band-limited signal. It is the minimum sample rate that will result in an alias-free representation of a signal. It must therefore be greater than twice the highest frequency component in the signal.
phasor: A complex equivalent of a sinusoidal wave quantity such that the complex modulus is the cosine wave amplitude, and the complex angle (in polar form) is the cosine wave phase angle.
phasor data concentrator (PDC): A data concentrator (DC’) used in phasor measurement systems.
rate of change of frequency (ROCOF) error (RFE): The measure of error between the theoretical ROCOF and the measured ROCOF for the given instant of time.
synchronism: The state in which connected alternating-current systems. machines, or a combination operate at the same frequency, and in which the phase angle displacements between voltages in them are constant or vary about a steady and stable average value.
synchronized phasor or synchrophasor: A phasor calculated from data samples using a standard time signal as the reference for the measurement.
NOTE In this standard, the phasors from remote sites have a defined common phase relationship. total ector error (TVF): The measure of error between the theoretical phasor value of the signal being measured and the phasor estimate.
NOTE—See 5.2.IEEE Std C37.118.1 pdf download.
