POSCLOSE
POSOPEN
RSTCBWR
BLOCK
BLKALM
Operation
counter
Alarm limit
Check
NOOPER
OPERALM
OPERLO
IEC12000617 V2 EN-US
Figure 275: Functional module diagram for circuit breaker operation cycles
Operation counter
The operation counter counts the number of operations based on the state of change
of the auxiliary contact inputs POSCLOSE and POSOPEN.
The number of operations NOOPER is given as a service value. The old circuit
breaker operation counter value can be used by adding the value to the
InitCounterVal parameter and can be reset by Clear CB wear in the Clear menu on
the LHMI or activating the input RSTCBWR.
Alarm limit check
OPERALM is generated when the number of operations exceeds the set value of the
OperAlmLevel threshold setting.
If the number of operations increases and exceeds the limit value set with the
OperLOLevel setting, the OPERLO output is activated.
The binary outputs OPERALM and OPERALO are deactivated when the BLKALM
input is activated.
15.4.7.6 Circuit breaker operation monitoring
GUID-6DAE4C6B-BD66-49CD-817D-08E4EBF47DE0 v9
The circuit breaker operation monitoring subfunction indicates the inactive days of
the circuit breaker and gives an alarm when the number of days exceed the set
level. The operation of the circuit breaker operation monitoring is shown in figure
276.
POSCLOSE
POSOPEN
BLOCK
BLKALM
Inactive timer
Alarm limit
Check
INADAYS
MONALM
IEC12000614 V2 EN-US
Figure 276: Functional module diagram for circuit breaker operation monitoring
Section 15 1MRK 505 394-UEN A
Monitoring
550 Line differential protection RED650 2.2 IEC
Technical manual
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