Toshiba GR200 Series - (iii) Single shot scheme for Permanent fault

6F2S1914 (0.49)
GRL200 (Soft 033 & 037)
- 441 -
CB fails to be closed.
GEN.TRIP
ARC1 IN-PROG
ARC1-S1 IN-PROG
ARC1 SHOT1
Dead time [TTPAR1]
ARC1 CLOSE COMMAND
[TCCW1]
)
CB#1 Status
Closed
Open
ARC1 CLOSE SUCCESS
ARC1 CLOSE FAIL
CB1 ALLPH
CLOSE
Fault current
ARC1 FT
ARC1-S2 IN-PROG
ARC1 SHOT2
ARC1-S3 IN-PROG
ARC1 SHOT3
[TARCSUC]
)
Relay operation
Operated
Issued
Closed
Open
Figure 2.34-7 Single shot scheme [ARC-NUM]=S1 for an Arcing fault; CB#1 fails to reclose
Note: The permissive signal ‘ARC1-VCHK’ is required in the TPAR mode for the ARC1
SHOT1 operation, but is omitted here for the sake of clarity.
(iii) Single shot scheme for Permanent fault
Figure 2.34-8 illustrates the behavior of the single shot scheme for a permanent fault. Tripping
of the CB#1 is executed correctly, but a further trip occurs following the reclosure of the CB#1.
Accordingly, the ARC function determines that the ARC1 operation cannot restore power
transmission in the single shot scheme; subsequently the ARC function goes to the final trip
(ARC1 FT) stage.
GEN.TRIP
ARC1 IN-PROG
ARC1-S1 IN-PROG
ARC1 SHOT1
Dead time [TTPAR1]
ARC1 CLOSE
COMMAND
[TCCW1]
)
CB#1 Status
Closed
Open
ARC1 CLOSE SUCCESS
ARC1 CLOSE FAIL
CB1 ALLPH
CLOSE
Fault current
ARC1 FT
ARC1-S2 IN-PROG
ARC1 SHOT2
ARC1-S3 IN-PROG
ARC1 SHOT3
Relay operation
Operated
Issued
Closed
Open
Figure 2.34-8 Single shot ARC scheme [ARC-NUM]=S1 for Permanent fault
Note: The permissive signal ‘ARC1-VCHK’ is required for the ARC SHOT1 operation, but
is omitted here for the sake of clarity.