ABB RELION Series, Техническое руководство

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A071109 V2 EN
Figure 286: Functional module diagram for calculating accumulative energy and
alarm
Accumulated energy calculator
This module calculates the accumulated energy I
y
t [(kA)
y
s]. The factor y is set with
the Current exponent setting.
The calculation is initiated with the
POSCLOSE
input opening events. It ends when
the RMS current becomes lower than the Acc stop current setting value.
A071110 V1 EN
Figure 287: Significance of the Difference Cor time setting
The Difference Cor time setting is used instead of the auxiliary contact to accumulate
the energy from the time the main contact opens. If the setting is positive, the
calculation of energy starts after the auxiliary contact has opened and when the delay
is equal to the value set with the
Difference Cor time setting. When the setting is
negative, the calculation starts in advance by the correction time before the auxiliary
contact opens.
The accumulated energy outputs
IPOW_A (_B, _C)
are available in the monitored
data view on the LHMI or through tools via communications. The values can be reset
by setting the parameter
Initial CB Rmn life setting to true in the clear menu from
WHMI or LHMI.
Alarm limit check
The
IPOW_ALM
alarm is activated when the accumulated energy exceeds the value
set with the Alm Acc currents Pwr threshold setting. However, when the energy
Section 7
1MRS758755 A
Condition monitoring functions
542 REC615 and RER615
Technical Manual