Toshiba GR200 Series Instruction Manual page 373

Fault current
Closed
CB#1 Status
Open
Operated
Relay operation
Issued
GEN.TRIP
ARC1 IN-PROG
ARC1-S1 IN-PROG
ARC1 SHOT1
Dead time [TTPAR1]
ARC1-S2 IN-PROG
ARC1 SHOT2
ARC1-S3 IN-PROG
ARC1 SHOT3
ARC1 CLOSE COMMAND
CB1 ALLPH
Closed
CLOSE
Open
ARC1 CLOSE SUCCESS
ARC1 CLOSE FAIL
ARC1 FT
Figure 2.24-6 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.
Single shot scheme for Permanent fault
(iii)
Figure 2.24-7 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.
Fault current
Closed
CB#1 Status
Open
Operated
Relay operation
Issued
GEN.TRIP
ARC1 IN-PROG
ARC1-S1 IN-PROG
Dead time [TTPAR1]
ARC1 SHOT1
ARC1-S2 IN-PROG
ARC1 SHOT2
ARC1-S3 IN-PROG
ARC1 SHOT3
ARC1 CLOSE
COMMAND
CB1 ALLPH
Closed
CLOSE
Open
ARC1 CLOSE SUCCESS
ARC1 CLOSE FAIL
ARC1 FT
Figure 2.24-7 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.
CB fails to be closed.
[TCCW1]
)
[TARCSUC]
)
[TCCW1]
)
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6F2S1915 (0.46)
GRZ200 (Soft 031 & 032)