PQ Trend
Table 7-14
Using PQ Trend Measurands
Measurand
Refresh Rate
Use in
FSR
SSR
CR
TR
PQ trend:f
Event-based
X
X
PQ trend:Vph rms
Event-based
X
X
PQ trend:Vpp rms
Event-based
X
X
PQ Flicker
The short-term flicker severity P
st
PQ flicker and the long-term flicker severity P
lt
PQ flicker are determined for
phase-to-ground and delta voltages (depending on the connection type). The flicker is measured in all 3
voltage channels of the corresponding feeder. Flicker appear with a frequency between 0.005 Hz and 35 Hz.
The flicker severity is determined as follows:
•
Short-term flicker severity P
st
: over 10 minutes (short-term flicker), permanently set
•
Long-term flicker severity P
lt
: over 2 hours (12 P
st
values), permanently set
•
Instantaneous value of flicker perception P
inst
19
•
P
imx
: Maximum value of flicker perception P
inst
i
i
NOTE
P
inst
and P
imx
serve as the qualification of the flicker algorithm and are not available for long-term recording.
You will find information about the average value, the refresh rate, and the recommended routing of the
frequency measurands in the following table.
Table 7-15
Using Flicker Measurands
Measurand
Refresh Rate
Use in
FSR
SSR
CR
TR
PQ flicker:Pst ph
10 min
X
X
PQ flicker:Plt ph
2 h
X
X
PQ flicker:Pinst ph
12 ms
X
PQ flicker:Pimx ph
12 ms
X
PQ flicker:Pst pp
10 min
X
X
PQ flicker:Plt pp
2 h
X
X
PQ flicker:Pinst pp
12 ms
X
PQ flicker:Pimx pp
12 ms
X
Other Measured Values (No Recorder Routing Measured Values)
Table 7-16
Using Other Measured Values
Measurand
Refresh Rate
Use in
FSR
SSR
CR
TR
For example, operational
measured values
For example, 180 ms
X
19
Pinst is designated as output 5 in the former version of the standard.
Fault Recorder
7.6 Measurands and Recorder Routing Functions
352
SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017
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