ABB Relion 670 series - Reporting Filters

Name Type Values (Range) Unit Description
FREQREFCHSEL INTEGER - - Frequency reference channel
number selected
FREQREFCHERR BOOLEAN 0=Freq ref not
available
1=Freq ref error
2=Freq ref
available
-
Frequency reference channel
error
FREQTRIG BOOLEAN - - Frequency trigger
DFDTTRIG BOOLEAN - - Rate of change of frequency
trigger
MAGHIGHTRIG BOOLEAN - - Magnitude high trigger
MAGLOWTRIG BOOLEAN - - Magnitude low trigger
6.2.3.2 Reporting filters
The PMUREPORT function block implements the reporting filters designed to avoid
aliasing as the reporting frequency is lower than the sample/calculation frequency. This
means, the synchrophasor and frequency data which are included in the C37.118
synchrophasor streaming data are filtered in order to suppress aliasing effects, as the rate
of the C37.118 data is slower than the data rate for internal processing. For this purpose,
there is an anti-aliasing filter designed for each reporting rate. The correct anti-aliasing
filter will be automatically selected based on the reporting rate and the performance class
(P/M) settings. The filters are designed to attenuate all aliasing frequencies to at least -40
dB (a gain of 0.01) at M class.
The synchrophasor measurement is adaptive as it follows the fundamental
frequency over a wide range despite the reporting rate.
For example, when the synchrophasor measurement follows the fundamental frequency
beyond the fixed Nyquist limits in C37.118 standard, the anti-aliasing filter stopband
moves with the measured fundamental frequency. This has to be considered in connection
with C37.118, where the passband is defined relative to a fixed nominal frequency as
shown in the equation 15.
0
2
s
F
f ±
IECEQUATION2418 V1 EN (Equation 15)
where,
f
0
is the nominal frequency
F
s
is the reporting rate
Section 6 1MRK 506 369-UUS -
Wide area measurement system
120 Line distance protection REL670 2.2 ANSI
Application manual