Power Quality; Pq 3Inf - ABB REX 521 Technical Reference Manual, Standard Configurations

REX 521
7.5.
7.5.1.
98
Protection Relay
Technical Reference Manual, Standard Configurations

Power quality

PQ 3Inf

The function block PQ 3Inf for current waveform distortion measurement is used for
measuring the harmonics and monitoring the power quality in distribution networks.
Although the European Standard EN 50160 concerns voltage distortion, the same
standard is applied to current distortion measurements in PQ 3Inf. Measuring
principles for individual harmonics and THD are adapted from the International
standard IEC 61000-4-7. The American standard IEEE Std 1159 is also partly
supported.
The function block measures quasi-stationary (slowly varying) harmonics up to
13th. Distortion measurement does not include rapidly changing harmonics,
interharmonics or other spurious components.
PQ 3Inf
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Current waveform distortion measurement, PQ 3Inf
The current waveform distortion measurement PQ 3Inf is used for measurement and statistical
analysis of current waveform distortion. The standards concerning voltage distortion measurement are
applied to current distortion measurement in PQ 3 Unf. Data collection and analysis is done according
to EN 50160. Measuring principles for individual harmonics and THD are adapted from the
International standard IEC 61000-4-7. The American standard IEEE Std 1159 is also partly supported.
Analysis can be done for one selected phase current or most distorted phase current can be tracked.
Measuring modes
Measurement activation
Triggering mode
Distortion factor
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
Not in use; L1; L2; L3; Worst phase
Triggering by: setting parameter, binary input, date & time
setting
Single; Continuous; Periodic
THD; TDD
0.0... 1000.0%
0.0... 1000.0% In
0.0... 1000.0% In
1 hour; 12 hours; 1 day; 2 days; 3 days; 4 days; 5 days; 6 days;
1 week
90.0... 99.5%
0.0... 1000.0% In
0.0... 1000.0% In
0.0... 1000.0% In
One data set for updating; One data set from the previous
observation period
1MRS 751802-MUM