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.
15.4.7.4 Accumulated energy
GUID-0163FF0F-6E18-4CDC-87AA-578304E0872E v11
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
273.
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.
POSCLOSE
BLOCK
BLKALM
Accumulated
energy
calculation
Alarm limit
Check
I3P-ILRMSPH
LRSTIPOW
TRIND
IPOWPH
IPOWALPH
IPOWLOPH
I3P-IL
TRCMD
IEC12000619-3-en.vsd
IEC12000619 V3 EN-US
Figure 273: Functional module diagram for estimating accumulated energy
Accumulated energy calculation
Accumulated energy can be calculated either with TRIND or POSCLOSE by
selecting the AccSelCal parameter value accordingly.
The calculation is initiated with the POSCLOSE or TRIND input events. It ends
when the RMS current is lower than the AccStopCurr setting.
The ContTrCorr setting is used to determine the accumulated energy in relation to
the time the main contact opens. If the setting is positive, the calculation of energy
starts after the auxiliary contact has opened and the delay equal to the value of the
ContTrCorr setting has passed. When the setting is negative, the calculation starts
in advance by the correction time in relation to when the auxiliary contact opened.
Section 15 1MRK 505 394-UEN A
Monitoring
548 Line differential protection RED650 2.2 IEC
Technical manual
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