ABB RELION 670 Series Technical Manual page 1061

1MRK 502 066-UUS B
decreased by at least one when the circuit breaker is opened. The operation of the remaining life
of circuit breaker subfunction is described in
I3P-ILRMSPH
POSCLOSE
RSTCBWR
BLOCK
BLKALM
IEC12000620 V3 EN-US
Figure 548: 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
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
operations of the circuit breaker are reduced 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.
OperNoRated parameter sets the number of operations the breaker can perform at the rated
The
current. The
the rated fault current.
Alarm limit check
When the remaining life of a circuit breaker phase drops below the
alarm CBLIFEAL is activated.
It is possible to deactivate the CBLIFEAL alarm signal by activating the binary input BLKALM.
The old circuit breaker operation counter value can be used by adding the value to the
InitCBRemLife parameter. The value can be reset using the Clear menu from LHMI or by activating
the input RSTCBWR.
16.4.7.4 Accumulated energy
The Accumulated energy subfunction calculates the accumulated energy (I
samples, where the setting
Figure 549.
The TRCMD output is enabled when either of the trip indications from the trip coil circuit TRIND is
high or the breaker status is OPENPOS.
Technical manual
CB remaining
life estimation
OperNoFault parameter sets the number of operations the breaker can perform at
CurrExponent (y) ranges from 0.5 to 3.0 . The operation is described in
Figure 548.
Alarm limit
Check
RatedFltCurr setting, the remaining
OperNoRated divided by the set
CBLifeAlmLevel setting, the life
Section 16
Monitoring
CBLIFEPH
CBLIFEAL
IEC12000620-3-en.vsd
RatedOperCurr
GUID-0163FF0F-6E18-4CDC-87AA-578304E0872E v10
y
t) based on current
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