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 548.
POSCLOSE
BLOCK
BLKALM
CB remaining
life estimation
Alarm limit
Check
I3P-ILRMSPH
RSTCBWR
CBLIFEPH
CBLIFEAL
IEC12000620-3-en.vsd
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
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
GUID-0163FF0F-6E18-4CDC-87AA-578304E0872E v10
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
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.
1MRK 502 066-UUS B Section 16
Monitoring
1055
Technical manual
To Next Page
Loading...
