System Alarms
THD Protection
In order to supervise power quality, the protective device can monitor the voltage (phase-to-phase) and current
THDs.
Within the [SysA/THD] menu:
Determine if an alarm is to be issued or not (Alarm active/inactive);
Set the threshold; and
Where applicable, set a delay time for the alarm.
Device Planning Parameters of the Demand Management
Parameter
Description
Options
Default
Menu path
Mode
Mode
do not use,
use
do not use
[Device planning]
Signals of the Demand Management (States of the Outputs)
Signal
Description
active
Signal: active
ExBlo
Signal: External Blocking
Alarm V THD
Signal: Alarm Total Harmonic Distortion Voltage
Trip V THD
Signal: Trip Total Harmonic Distortion Voltage
138
MRU4
DOK-HB-MRU4-2E
