1MAC309294-MB F Section 6
Condition monitoring functions
RER620 361
Technical Manual
Figure 194: 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_A(_B,_C) and POSCLOSE auxiliary contacts.
The inactive days is available through the Monitored data view. It is also possible to set
the initial inactive days by using the parameter.
Alarm limit check
When the inactive days exceed the limit value defined with the setting, the alarm is
initiated. The time in hours at which this alarm is activated can be set with the parameter
as coordinates of UTC. The alarm signal can be blocked by activating the binary input
BLOCK.
6.1.4.3 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.
Inactivity
timer (A)
POSOPEN_A
POSCLOSE_A
BLOCK
Alarm limit
check
MON_ALM
Inactivity
timer (B)
POSOPEN_B
POSCLOSE_B
Inactivity
timer (C)
POSOPEN_C
POSCLOSE_C
This subfunction requires two position inputs POSOPEN_A(_B,_C) and
POSCLOSE_A(_B,_C) from the circuit breaker.
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