Application
VMHAI provides a method for monitoring the power quality by means of the voltage
waveform distortion.
Signals
Table 57:
VMHAI Input signals
Name
Type
Default
Description
U_A
SIGNAL
-
Phase to earth voltage
A
U_B
SIGNAL
-
Phase to earth voltage
B
U_C
SIGNAL
-
Phase to earth voltage
C
BLOCK
-
Block through settings
only
Table 58:
VMHAI Output signals
Name
Type
Description
HiAThd
BOOLEAN
Alarm signal for THD
Settings
Table 59:
VMHAI Settings
Name
Values (Range)
Unit
Step
Default
Description
Operation
On
Off
-
-
On
Operation Off/On
THD Alarm Limit
5.0…100.0
%
0.1
10%
Limit of THD
Measuring Mode
Worst case
Phase A
Phase B
Phase C
-
-
Worst case
Specifies the
monitored phase
6.1.6.4
Three-phase current fault detection
Three-phase non-directional overcurrent fault detection PHPTOC
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Three-phase non-directional
overcurrent fault detection
PHPTOC
3I>
51P
1MRS757488 H
Section 6
Commissioning
RIO600
89
Installation and Commissioning Manual
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