ABB REL670 2.2 IEC, Applications Manual

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PID-6244-MONITOREDDATA v2
Table 15: PMUREPORT Monitored data
Name Type Values (Range) Unit Description
TIMESTAT BOOLEAN 1=Ready
0=Fail
- Time synchronization
status
FREQ REAL - Hz Frequency
FREQGRAD REAL - - Rate of change of
frequency
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
GUID-D39153B5-81CE-4C1F-A816-C7A4C3407048 v2
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
12 .
0
2
s
F
f
±
IECEQUATION2418 V1 EN-US
(Equation 12)
where,
1MRK 506 369-UEN B
Section 6
Wide area measurement system
Line distance protection REL670 2.2 IEC 115
Application manual