Main Contact
close
open
POSCLOSE
1
0
Energy
Accumulation
starts
ContTrCorr
(Negative)
Main Contact
close
POSCLOSE
Energy
Accumulation
starts
ContTrCorr
(Positive)
1
0
open
IEC12000618_1_en.vsd
IEC12000618 V1 EN
Figure 432:
Significance of correction factor 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.
Accumulated energy can also be calculated by using the change of state of the trip
output.
TRIND
is used to get the instance of the trip output and the time delay between
the trip initiation and the opening of the main contact is introduced by the setting
OperTimeDelay
.
The accumulated energy output
IPOWPH
is provided as a service value. The value can
be reset by enabling
RSTIPOW
through LHMI or by activating the input
RSTIPOW
.
Alarm limit check
The
IPOWALPH
alarm is activated when the accumulated energy exceeds the set
value
AlmAccCurrPwr
.
IPOWLOPH
is activated when the accumulated energy exceeds the limit of the
LOAccCurrPwr
setting.
The
IPOWALPH
and
IPOWLOPH
outputs can be blocked by activating the binary
input
BLOCK
.
16.4.7.5
Circuit breaker operation cycles
The circuit breaker operation cycles subfunction counts the number of closing-
opening sequences of the breaker. The operation counter value is updated after each
closing-opening sequence. The operation is described in figure
.
Section 16
1MRK502052-UEN B
Monitoring
906
Technical manual
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