ABB REG670 - Remaining Life of Circuit Breaker

have the same value or if the auxiliary input contact POSCLOSE is low and the
POSOPEN input is high but the current is above the setting AccStopCurr.
The status of the breaker is indicated with the binary outputs OPENPOS, CLOSEPOS
and INVDPOS for open, closed and error position respectively.
16.4.7.3 Remaining life of circuit breaker
The Remaining life of circuit breaker subfunction is used to give an indication on the
wear and tear of the circuit breaker. Every time the breaker operates, the life of the
circuit breaker reduces due to wear. The breaker wear depends on the interrupted
current. The remaining life of the breaker is estimated from the circuit breaker trip
curve provided by the manufacturer. The remaining life is decreased by at least one
when the circuit breaker is opened. The operation of the remaining life of circuit
breaker subfunction is described in Figure 430.
POSCLOSE
BLOCK
BLKALM
CB remaining
life estimation
Alarm limit
Check
I3P-ILRMSPH
RSTCBWR
CBLIFEPH
CBLIFEAL
IEC12000620-3-en.vsd
IEC12000620 V3 EN
Figure 430: Functional module diagram for estimating the life of the circuit
breaker
Circuit breaker remaining life estimation
If the interrupted current is less than the rated operating current set using the
RatedOperCurr setting, the remaining operations of the breaker are reduced by one
operation. If the interrupted current is more than the rated fault current set using the
RatedFltCurr setting, the remaining operations of the circuit breaker are reduced by
the set OperNoRated by divided by the set OperNoFault value. If the tripping current
is between these two values, the remaining life of the circuit breaker is calculated
based on the maintenance curve equation given by the manufacturer. The
OperNoRated parameter sets the number of operations the breaker can perform at the
rated current. The OperNoFault parameter sets the number of operations the breaker
can perform at the rated fault current.
Alarm limit check
When the remaining life of a circuit breaker phase drops below the CBLifeAlmLevel
setting, the life alarm CBLIFEAL is activated.
It is possible to deactivate the CBLIFEAL alarm signal by activating the binary input
BLKALM.
Section 16 1MRK502052-UEN B
Monitoring
904
Technical manual