6.Power Quality - ABB REX 521 Technical Reference Manual, Standard Configurations

1MRS751802-MUM
11.5.5.6.
Protection Relay
Technical Reference Manual, Standard Configurations
• Manual triggering via the HMI or with the external input signal
• Triggering via communication parameter
• Periodic triggering
Regardless of the triggering type, each recording generates the event E31. The
triggering time and reason are included in the recording. Number of recordings can
be viewed in Main menu\Measurements\DREC\Control setting\
# records.
External triggering can be made by means of the reserved input signal "DREC trig"
connected to one of the digital inputs. The settings can be found in
Main menu\Configuration\Input Signals\DREC trig.
Refer to the CD-ROM Technical Descriptions of Functions (MEDREC16) for more
information about the disturbance recorder.
Power quality
The power quality functions (PQ 3Inf and PQ 3Unf) can be found in
Main menu\Power Quality\PQ 3Inf and Main menu\Power
Quality\PQ 3Unf. The functions are used for measuring the harmonics and
monitoring the power quality in distribution networks.
The power quality function can be triggered by any of the alternatives listed below:
• Manual triggering via the HMI
• With the external input signal
• Triggering via communication parameter
• Preset time and date
External triggering can be made by means of the reserved input signals "PQ 3Inf
trig" and "PQ 3Unf trig" connected to the digital inputs. The settings can be found
in Main menu\Configuration\Input Signals\PQ 3Inf trig and
Main menu\Configuration\Input Signals\PQ 3Unf trig.
The functions can deliver the alarm signals "PQ 3Inf cum" and "PQ 3Unf cum", an
output signal for exceeding a setting limit for cumulative probability of a harmonic
and the "PQ 3Inf har" and "PQ 3Unf har", an output signal for exceeding a setting
limit for a harmonic. The alarm signals can be routed to the output contacts via the
switchgroups. The connection settings can be made in
Main menu\Configuration\Output SWGRP\Alarm 1\ or
\Alarm 2\. The "Alarm 1" or "Alarm 2" output signal can be then connected to
an output relay and the settings are done in
Main menu\Configuration\Output Signals\.
Refer to the CD-ROM
Technical Descriptions of Functions
information about the power quality function.
REX 521
(PQCU3H) for more
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