Operation Principle - ABB RELION REX640 Technical Manual

Section 7
Condition monitoring functions
7.1.5
1254
Table 1192: Analog inputs
Input
I3P
See the preprocessing function blocks in this document for the
possible signal sources.
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.

Operation principle

The circuit breaker condition monitoring function includes different metering and
monitoring sub-functions. The functions can be enabled and disabled with the
Operation setting. The corresponding parameter values are "On" and "Off". The
operation counters are cleared when Operation is set to "Off".
The operation of SSCBR can be described with a module diagram. All the modules in
the diagram are explained in the next sections.
Description
Three-phase currents
1MRS759142 C
REX640
Technical Manual