Flicker; Function Description - Siemens SICAM 7KG85X Manual

Power Quality

6.2 Flicker

6.2 Flicker

Function Description

6.2.1
The flicker is measured according to IEC 61000-4-15.
The short-term flicker value (Pst) and the long-term flicker value (Plt) are determined for phase-to-ground
voltages and delta voltages. The flicker is measured on all 3 voltage channels.
Flickers appear with a frequency from 0.005 Hz to 35 Hz.
The device measures the following flicker types:
•
Short-term flicker values (Pst)
Determined by 10 min (short-term flicker), fixed
•
Long-term flicker values (Plt)
Over 2 h (12 Pst values), fixed
Table 6-3
Measured Quantities
Short-Term Flicker
P
st
P
st
P
st
P
st
P
st
P
st
Long-Term Flicker
P
lt
P
lt
P
lt
P
lt
P
lt
P
lt
Interfaces: protocols IEC 61850 (PQDIF depending on the measuring interval) and Modbus TCP
The measurement range and accuracy are specified according to the standard IEC 61000-4-15.
Table 6-4
Rectangular
Changes per
Minute (CPM)
1
2
7
39
110
1620
4000
120
Recording of the Flicker
Measurement Records
PQDIF (Only in SICAM P855)
(a-n)
(b-n)
(c-n)
(a-b)
(b-c)
(c-a)
(a-n)
(b-n)
(c-n)
(a-b)
(b-c)
(c-a)
Test Specifications for the Flickermeter Classifier
Voltage Fluctuation %
120-V Lamp
50-Hz System
3.178
2.561
1.694
1.045
0.844
0.545
3.426
x
x
x
x
x
x
x
x
x
x
x
x
120-V Lamp 230-V Lamp
60-Hz System 50-Hz System
3.181 2.715
2.564 2.191
1.694 1.450
1.040 0.894
0.844 0.722
0.548 0.407
Test not required 2.343
230-V Lamp
60-Hz System
2.719
2.194
1.450
0.895
0.723
0.409
Test not required
SICAM, SICAM P850/P855 7KG85X, Manual
E50417-H1040-C482-A9, Edition 03.2022