ABB RELION REX640 Technical Manual page 1443

1MRS759142 F
8.1.4.2 Function block
Figure 806: Function block
8.1.4.3 Functionality
The three-phase current measurement function CMMXU provides limit value
supervision output (HIGH_ALARM, HIGH_WARN, LOW_WARN, LOW_ALARM). The delay
of the activation and deactivation of these outputs can be controlled with setting
parameters
Instantaneous phase currents (I_INST_A, I_INST_B and I_INST_C) are provided as
outputs in amperes. These can be used in the application configuration.
Phase current demand values (I_DMD_A, I_DMD_B and I_DMD_C) are provided
as outputs in amperes. These outputs are dedicated for Load profile recorder
(LDPRLRC).
8.1.4.4 Analog channel configuration
CMMXU has one analog group input which must be properly configured.
Table 1362: Analog inputs
Input
I3P
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.
8.1.4.5 Signals
REX640
Technical Manual
On delay time and Off delay time .
See the preprocessing function blocks in this document for the possible
signal sources.
Measurement functions
Description
Three-phase currents
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