ABB RELION REX640 Technical Manual page 1466

Measurement functions
8.1.9.3 Functionality
The residual voltage measurement function RESVMMXU provides limit value
supervision output (HIGH_ALARM, HIGH_WARN). Setting parameters
and
deactivation of alarm and warning outputs.
Instantaneous residual voltage in volt is available for application configurations
through output U_INST_RES. The residual voltage demand value in volt is for
connecting to Load profile recorder (LDPRLRC) through output U_DMD_RES.
8.1.9.4 Analog channel configuration
RESVMMXU has one analog group input which must be properly configured.
Table 1400: Analog inputs
Input
URES
There are a few special conditions which must be noted with the configuration.
Table 1401: Special conditions
Condition
URES calculated
Improper analog channel configuration causes a validation error if the analog
channels are not completely configured or they do not match with certain settings.
For troubleshooting, check the contents of this chapter and also the preprocessing
blocks in this document. The configuration can be written to the protection relay
once the mismatch is corrected.
8.1.9.5 Signals
RESVMMXU Input signals
Table 1402: RESVMMXU Input signals
Name
URES
BLOCK
1466
Off delay time are used for controlling the activation and, respectively, the
See the preprocessing function blocks in this document for the possible
signal sources.
Type
SIGNAL
BOOLEAN
Description
Residual voltage (measured or calculated)
Description
The function requires that all three voltage
channels are connected to calculate residu-
VT connection must be
al voltage. Setting
"Wye" in that particular UTVTR.
Default Description
- Residual voltage
0=False Block signal for all bi-
nary outputs
1MRS759142 F
On delay time
REX640
Technical Manual