ABB RELION REX640 Technical Manual page 1458

Measurement functions
8.1.7 Single-phase voltage measurement VAMMXU (ANSI V_A)
8.1.7.1 Identification
Function description
Single-phase voltage measurement VAMMXU
8.1.7.2 Function block
Figure 809: Function block
8.1.7.3 Functionality
The single-phase voltage measurement function VAMMXU provides limit value
supervision output (HIGH_ALARM, HIGH_WARN, LOW_WARN, LOW_ALARM).
Instantaneous single-phase voltage in volt is available for application configurations
through output U_INST. Phase voltage demand value in volt is for connecting to
Load profile recorder (LDPRLRC) through output U_DMD.
8.1.7.4 Analog channel configuration
VAMMXU has one analog group input which must be properly configured.
Table 1385: Analog inputs
Input
U3P
There are a few special conditions which must be noted with the configuration.
Table 1386: Special conditions
Condition
U3P connected to real measurements
1458
See the preprocessing function blocks in this document for the possible
signal sources.
IEC 61850 IEC 60617
identification identification
U_A
Description
Voltage group signal
Description
The function requires that the first phase
voltage U_A or U_AB is connected.
1MRS759142 F
ANSI/IEEE C37.2
device number
V_A
REX640
Technical Manual