ABB REF 541 Product Manual page 36

36
Feeder Terminal
Monitored values
THD (3 sec and 10 min mean values)
Harmonic components from 1st to
13th (3 sec mean values)
Harmonic components from 2nd to
13th (10 min mean values)
Statistics
Observation times for statistics
Percentile setting
Percentiles for each harmonic and
THD
Five fixed percentiles (1,5,50,95,99)
for one selectable harmonic or THD
Maximum values for each harmonic
and THD
Recorded data
Harmonic limit supervision
Limit for THD
Limits for each harmonic
Recorded data
Operation criteria
Fundamental frequency
Frequency deviation
Amplitude of the fundamental wave
Measurement accuracy
Measured harmonic Um = 1st, ... ,
10th
Measured harmonic Um = 11th, ... ,
13th
Short duration voltage variation measurement, PQVO3Sd, PQ3U< > (PQ3U< >)
The PQVO3Sd function block is used for measuring short duration voltage variations. Power quality is
being evaluated in the voltage waveform by measuring voltage swells, sags and interruptions. Power
quality measurements carried out by the function block PQVO3Sd follow the European Standard 
EN 50160. Measuring principles are taken from the International standard IEC 61000-4-30.
Swell start voltage
Sag start voltage
Interruption start voltage
Minimum duration
Maximum duration
Measurement accuracy (in normal
operating conditions)
Duration measurement
Voltage and current measurement
Reset ratio, typically
Table 8: Energizing inputs
Rated frequency
Current inputs rated current
thermal withstand
capability
dynamic current withstand, half-wave value
input impedance
REF 541, REF 543, REF 545.
0.0 ... 120.0%
0.0 ... 120.0% Un
0.0 ... 120.0% Un
1 hour; 12 hours; 1 day; 2 days; 3 days; 4 days; 5 days; 6 days; 1
week
90.0 ... 99.5%
0.0 ... 120.0% Un
0.0 ... 120.0% Un
0.0 ... 120.0% Un
One data set for updating; One data set from the previous
observation period
0.0 ... 30.0%
0.0 ... 20.0% Un
If any limit should be exceeded, the whole harmonic set will be
recorded during the maximum THD (3 sec values)
0.9 ... 1.1 Fn
 0.5 Hz (difference between max and min values within one
second)
 0.7 Un
In accordance with IEC 61000-4-7
 0.3% Un, if Um < 3% Un;  10% Um, if Um  3% Un
100.0 ... 200.0%
0.0 ... 100.0%
0.0 ... 100.0%
8 ... 60000ms
8 ... 60000ms
In accordance with IEC 61000-4-30 Class A
In accordance with IEC 61000-4-30 Class B
0.95
50.0/60.0 Hz
continuously
for 1 s
1MRS750443-MBG
0.2 A/1 A/5 A
1.5 A/4 A/20 A
20 A/100 A/500 A
50 A/250 A/1250 A
<750 m/<100m
<20 m