Accumulated Energy - ABB RES670 Technical Manual

1MRK 511 408-UUS A
16.4.7.4
Phasor measurement unit RES670 2.2 ANSI
Technical manual
I3P-ILRMSPH
POSCLOSE
RSTCBWR
BLOCK
BLKALM
IEC12000620 V3 EN-US
Figure 211: 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.

Accumulated energy

The Accumulated energy subfunction calculates the accumulated energy (I
current samples, where the setting CurrExponent (y) ranges from 0.5 to 3.0. The
operation is described in figure 212.
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.
CB remaining
life estimation
Alarm limit
Section 16
Monitoring
CBLIFEPH
CBLIFEAL
Check
IEC12000620-3-en.vsd
GUID-0163FF0F-6E18-4CDC-87AA-578304E0872E v11
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