ABB RES670 Technical Manual page 217

1MRK 511 408-UUS A
Phasor measurement unit RES670 2.2 ANSI
Technical manual
SOTF
Open
Closed
SOTFSel
Close command
PUST2
StepForSOTF
PUST3
BLOCK
UNDERTIME
2nd Harmonic
EnHarmRestSOTF
Open
OR
Close
ActUndrTimeSel
Close command
PUST4
ANSI06000643 V5 EN-US
Figure 63: Simplified logic diagram for SOTF and under-time features
Simplified logic diagram for the complete EF4PTOC (51N/67N) function is shown in
Figure 64:
t4U
tSOTF
AND
AND t
tUnderTime
AND
t
t4U
AND
Section 8
Current protection
SOTF
Disabled
SOTF
TRIP
Undertime
Undertime
OR
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