ABB RELION REX640 Technical Manual page 1353

1MRS759142 F
CTSRCTF detects a fault in the measurement circuit and issues an alarm which can
be used for blocking the protection functions, for example, differential protection,
to avoid unwanted tripping.
CTSRCTF is internally blocked in case of a transformer under no-load condition or if
a current in any one phase exceeds the set maximum limit.
6.9.4 Analog channel configuration
CTSRCTF has three analog group inputs which must be properly configured.
Table 1303: Analog inputs
Input
I3P1
I3P2
I3P3
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.
6.9.5 Operation principle
The function can be enabled and disabled with the
corresponding parameter values are "On" and "Off".
The operation of CTSRCTF can be described with a module diagram. All the modules
in the diagram are explained in the next sections.
REX640
Technical Manual
See the preprocessing function blocks in this document for the possible
signal sources.
Supervision functions
Description
Three-phase currents
Three-phase currents
Three-phase currents, can be connected to
GRPOFF
Operation setting. The
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