1MRS751802-MUM REX 521225Protection RelayTechnical Reference Manual, Standard Configurations• Manual triggering via the HMI or with the external input signal• Triggering via communication parameter• Periodic triggeringRegardless of the triggering type, each recording generates the event E31. Thetriggering time and reason are included in the recording. Number of recordings canbe 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 inMain menu\Configuration\Input Signals\DREC trig.Refer to the CD-ROM Technical Descriptions of Functions (MEDREC16) for moreinformation about the disturbance recorder.11.5.5.6. Power qualityThe power quality functions (PQ 3Inf and PQ 3Unf) can be found inMain menu\Power Quality\PQ 3Inf and Main menu\PowerQuality\PQ 3Unf. The functions are used for measuring the harmonics andmonitoring 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 dateExternal triggering can be made by means of the reserved input signals “PQ 3Inftrig” and “PQ 3Unf trig” connected to the digital inputs. The settings can be foundin Main menu\Configuration\Input Signals\PQ 3Inf trig andMain menu\Configuration\Input Signals\PQ 3Unf trig.The functions can deliver the alarm signals “PQ 3Inf cum” and “PQ 3Unf cum”, anoutput signal for exceeding a setting limit for cumulative probability of a harmonicand the “PQ 3Inf har” and “PQ 3Unf har”, an output signal for exceeding a settinglimit for a harmonic. The alarm signals can be routed to the output contacts via theswitchgroups. The connection settings can be made inMain menu\Configuration\Output SWGRP\Alarm 1\ or\Alarm 2\. The “Alarm 1” or “Alarm 2" output signal can be then connected toan output relay and the settings are done inMain menu\Configuration\Output Signals\.Refer to the CD-ROM Technical Descriptions of Functions (PQCU3H) for moreinformation about the power quality function.
