ABB Relion 650 Series Technical Manual page 502

Section 13
Monitoring
13.17.7.5
Accumulation of I
Accumulation of the I
The operation of the module can be described by using a module diagram. All the modules in the
diagram are explained in the next sections.
I3P
POSCLOSE
IACCRST
BLOCK
BLK_ALM
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Figure 258: Functional module diagram for calculating accumulative energy and alarm
Accumulated energy calculator
This module calculates the accumulated energy I
setting.
The calculation is initiated with the POSCLOSE input open events. It ends when the RMS current
becomes lower than the
GUID-75502A39-4835-4F43-A7ED-A80DC7C1DFA2 V1 EN-US
Figure 259: Significance of theDiffTimeCorr setting
The DiffTimeCorr 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
DiffTimeCorr setting. When the setting is negative, the calculation starts in advance by the
correction time before the auxiliary contact opens.
The accumulated energy outputs IACC_A (_B, _C) are available through the Monitored data
view on the LHMI or through tools via communications. The values can be reset by setting the
Clear accum. breaking curr setting to true in the clear menu from LHMI.
496
y
t
y
t module calculates the accumulated energy.
I_A
Accumula-
I_B
ted energy
calculator
I_C
AccDisLevel setting value.
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IACCLOAL
Alarm limit
check
IACCALM
y y
t [(kA) s]. The factor y is set with the
1MRK 506 326-UUS B
GUID-0163FF0F-6E18-4CDC-87AA-578304E0872E v6
CurrExp
Line distance protection REL650
Technical manual