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

REX 521
9.2.4.6.
124
Protection Relay
Technical Reference Manual, Standard Configurations
• 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.
Please refer to the CD-ROM Technical Descriptions of Functions (MEDREC16) for
more information about the disturbance recorder.

Power quality

The power quality function (PQ 3Inf) can be found in Main menu\Power
Quality\PQ 3Inf. The function is 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 signal "PQ 3Inf trig"
connected to one of the digital inputs. The settings can be found in
Main menu\Concfiguration\Input Signals\PQ 3Inf trig.
The function can deliver the alarm signals "PQ 3Inf cum", an output signal for
exceeding a setting limit for cumulative probability of a harmonic and the "PQ 3Inf
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\Output Signals\.
Please refer to the CD-ROM Technical Descriptions of Functions (PQCU3H) for
more information about the power quality function.
1MRS 751802-MUM