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ABB Relion 670 series - Page 418

ABB Relion 670 series
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UNDERTIME
EnHarmRestSOTF
ActUndrTimeSel
t4U
AND
t
tUnderTime
OR
Open
Closed
Close command
SOTFSel
t4U
StepForSOTF
PUST2
PUST3
AND
t
tSOTF
AND
BLOCK
2nd Harmonic
AND
Open
Close
Close command
PUST4
SOTF
Undertime
TRIP
Disabled
OR
Undertime
SOTF
OperationMode
ANSI06000643-3.vsd
ANSI06000643 V3 EN
Figure 210: Simplified logic diagram for SOTF and Under-Time features
EF4PTOC (51N/67N) Logic Diagram Simplified logic diagram for the complete
EF4PTOC (51N/67N) function is shown in figure 211:
Section 7 1MRK505222-UUS C
Current protection
412
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