ABB RELION SMU615 Technical Manual page 171

1MRS758407 C
Figure 114: Functional module diagram for calculating accumulative energy and
alarm
Accumulated energy calculator
This module calculates the accumulated energy I
the
The calculation is initiated with the POSCLOSE input opening events. It ends when
the RMS current becomes lower than the
Figure 115: Significance of the Difference Cor time setting
The
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
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 WHMI or through tools via communications. The values can be
reset by setting the parameter
menu from WHMI.
Alarm limit check
The IPOW_ALM alarm is activated when the accumulated energy exceeds the value
set with the
exceeds the limit value set with the
IPOW_LO output is activated.
SMU615
Technical Manual
Current exponent setting.
Difference Cor time setting is used instead of the auxiliary contact to
Alm Acc currents Pwr threshold setting. However, when the energy
Condition monitoring functions
y
t [(kA)
Acc stop current setting value.
Difference Cor time setting. When
CB accum. currents power setting to true in the clear
LO Acc currents Pwr threshold setting, the
y
s]. The factor y is set with
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