ABB REC650 ANSI Technical Manual page 537

1MRK 511 287-UUS A
12.18.7.3
Technical manual
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Figure 233: 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 NOOPRDAY is available through the Monitored data view. It is also
possible to set the initial inactive days by using the InactDayInit parameter.
Alarm limit check
When the inactive days exceed the limit value defined with the InactDayAlm setting, the
NOOPRALM alarm is initiated. The time in hours at which this alarm is activated can be set
with the InactHourAlm parameter as coordinates of UTC. The alarm signal NOOPRALM
can be blocked by activating the binary input BLOCK.
Breaker contact travel time
The breaker contact travel time module calculates the breaker contact travel time for the
closing and opening operation. The operation of the breaker contact travel time
measurement can be described by using a module diagram. All the modules in the diagram
are explained in the next sections.
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Figure 234: Functional module diagram for breaker contact travel time
Section 12
Monitoring
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