10.2.5 Application
VMHAI provides a method for monitoring the power quality by means of the voltage
waveform distortion. VMHAI provides a short-term three-second average and long-
term demand for THD.
10.2.6 Signals
Table 686: VMHAI Input signals
Name Type Default Description
U_A_AB SIGNAL 0 Phase-to-earth voltage A or phase-to-phase
voltage AB
U_B_BC SIGNAL 0 Phase-to-earth voltage B or phase-to-phase
voltage BC
U_C_CA SIGNAL 0 Phase-to-earth voltage C or phase-to-phase
voltage CA
BLOCK BOOLEAN 0=False Block signal for all binary outputs
Table 687: VMHAI Output signals
Name
Type Description
ALARM BOOLEAN Alarm signal for THD
10.2.7 Settings
Table 688: VMHAI Non group settings (Basic)
Parameter
Values (Range) Unit Step Default Description
Operation 1=on
5=off
1=on Operation Off / On
Demand interval 0=1 minute
1=5 minutes
2=10 minutes
3=15 minutes
4=30 minutes
5=60 minutes
6=180 minutes
2=10 minutes Time interval for demand calculation
Demand window 1=Sliding
2=Non-sliding
1=Sliding Demand calculation window type
THD alarm limit 1.0...100.0 % 0.1 50.0 THD alarm limit
Section 10 1MRS758755 A
Power quality measurement functions
678 REC615 and RER615
Technical Manual
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