ABB COM600 series, User'S & Technical Manual, Page: 49 / 60

Circuit breaker operation monitoring and operation
counter 5.5.
Circuit breaker operation monitoring and operation counter 5.5.1.
The purpose of the circuit breaker operation monitoring subfunction is to indicate if the
circuit breaker has not been operated for a long time.
The operation of the circuit breaker operation monitoring can be described with a module
diagram. All the modules in the diagram are explained in the next sections.
functional_module_diagram_for_calculating_inactive_days.png
Figure 5.5.1-1 Functional module diagram for calculating inactive days and alarm for circuit
breaker operation monitoring
Inactivity timer
The module calculates the number of days the circuit breaker has remained inactive, that
is, has stayed in the same open or closed state. The calculation is done by monitoring
the states of the POSOPEN and POSCLOSE auxiliary contacts.
The inactive days INA_DAYS is available in the Real time Data base.
Alarm limit check
When the inactive days exceed the limit value defined with the Inactive Alm days setting,
the MON_ALM alarm is initiated. The time in hours at which this alarm is activated can
be set with the Inactive Alm hours parameter as coordinates of UTC. The alarm signal
MON_ALM can be blocked by activating the binary input BLOCK.
Operation counter 5.5.2.
The operation counter subfunction calculates the number of breaker operation cycles.
The opening and closing operations are both included in one operation cycle. The oper-
ation counter value is updated after each opening operation.
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COM600 series 5.1 1MRS758734
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