Remaining Life Of The Circuit Breaker - ABB REG650 Technical Manual

Section 13
Monitoring
13.15.7.6
438
Alarm limit check
The IACCALM alarm is activated when the accumulated energy exceeds the value
set with the AccCurrAlmLvl threshold setting. However, when the energy exceeds
the limit value set with the AccCurrLO threshold setting, the IACCLOAL output is
activated.
The IACCALM and IACCLOAL outputs can be blocked by activating the binary
input BLOCK.

Remaining life of the circuit breaker

Every time the breaker operates, the life of the circuit breaker reduces due to
wearing. The wearing in the breaker depends on the tripping current, and the
remaining life of the breaker is estimated from the circuit breaker trip curve
provided by the manufacturer. The remaining life is decremented at least with one
when the circuit breaker is opened.
The operation of the remaining life of the circuit breaker subfunction can be
described by using a module diagram. All the modules in the diagram are explained
in the next sections.
GUID-1565CD41-3ABF-4DE7-AF68-51623380DF29 V1 EN
Figure 214: Functional module diagram for estimating the life of the circuit
breaker
Circuit breaker life estimator
The circuit breaker life estimator module calculates the remaining life of the circuit
breaker. If the tripping current is less than the rated operating current set with the
RatedOpCurr setting, the remaining operation of the breaker reduces by one
operation. If the tripping current is more than the rated fault current set with the
RatedFaultCurr setting, the possible operations are zero. The remaining life of the
tripping current in between these two values is calculated based on the trip curve
given by the manufacturer. The OpNumRatCurr and OPNumFaultCurr parameters
set the number of operations the breaker can perform at the rated current and at the
rated fault current, respectively.
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Technical Manual