Application - ABB RELION Series Technical Manual

Section 10
Power quality measurement functions
10.2.5
10.2.6
10.2.7
Table 688: VMHAI Non group settings (Basic)
Parameter
Operation
Demand interval
Demand window
THD alarm limit
678

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.
Signals
Table 686: VMHAI Input signals
Name
U_A_AB
U_B_BC
U_C_CA
BLOCK
Table 687: VMHAI Output signals
Name
ALARM
Settings
Values (Range) Unit
1=on
5=off
0=1 minute
1=5 minutes
2=10 minutes
3=15 minutes
4=30 minutes
5=60 minutes
6=180 minutes
1=Sliding
2=Non-sliding
1.0...100.0 %
Type Default Description
SIGNAL 0 Phase-to-earth voltage A or phase-to-phase
voltage AB
SIGNAL 0 Phase-to-earth voltage B or phase-to-phase
voltage BC
SIGNAL 0 Phase-to-earth voltage C or phase-to-phase
voltage CA
BOOLEAN 0=False Block signal for all binary outputs
Type Description
BOOLEAN Alarm signal for THD
Step Default
1=on
2=10 minutes
1=Sliding
0.1 50.0
1MRS758755 A
Description
Operation Off / On
Time interval for demand calculation
Demand calculation window type
THD alarm limit
REC615 and RER615
Technical Manual