POSCLOSE
BLOCK
BLKALM
CB remaining
life estimation
Alarm limit
Check
I3P-ILRMSPH
RSTCBWR
CBLIFEPH
CBLIFEAL
IEC12000620-3-en.vsd
IEC12000620 V3 EN
Figure 200:
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
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
.
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
y
t) based on
current samples, where the setting
CurrExponent
(y) ranges from
0.5
to
3.0
. The operation
is described in
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.
1MRK 511 365-UUS A
Section 16
Monitoring
Phasor measurement unit RES670 2.1 ANSI
533
Technical manual
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