ABB Relion 620 Series - Page 910

7.1.4 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.
Figure 485: Functional module diagram
7.1.4.1 Circuit breaker status
The Circuit breaker status sub-function monitors the position of the circuit breaker,
that is, whether the breaker is in open, closed or invalid position. The operation of
the breaker status monitoring can be described by using a module diagram. All the
modules in the diagram are explained in the next sections.
Condition monitoring functions
1MRS757644 H
910 620 series
Technical Manual