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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
Summary of Contents for RELION Series
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