Toshiba GR-200-5 Instruction Manual page 265

Fault current
Closed
CB Status
Open
Operated
Relay operation
Issued
GEN.TRIP
ARC IN-PROG
ARC-S1 IN-PROG
ARC SHOT1 Dead time [TSHOT]
ARC-S2 IN-PROG
ARC SHOT2
ARC-S3 IN-PROG
ARC SHOT3
ARC CLOSE COMMAND
CB ALLPH
Closed
CLOSE
Open
ARC CLOSE SUCCESS
ARC CLOSE FAIL
ARC FT
Figure 2.22-11 Single shot scheme [ARCNUM]=S1 for an Arcing fault; CB fails to reclose
Note: As described in Chapter 2.22.4(iii), the permissive signal 'ARC-VCHK' is required
for the ARC SHOT1 operation, but is omitted here for the sake of clarity.
Single shot scheme for Permanent fault
(iii)
Figure 2.22-12 illustrates the behavior of the single shot scheme for a permanent fault.
Tripping of the CB is executed correctly, but a further trip occurs following the reclosure of the
CB. Accordingly, the ARC function determines that the ARC operation cannot restore power
transmission in the single shot scheme; subsequently the ARC function goes to the final trip
(FT) stage.
Fault current
Closed
CB Status
Open
Operated
Relay operation
Issued
GEN.TRIP
ARC IN-PROG
ARC-S1 IN-PROG
Dead time [TSHOT]
ARC SHOT1
ARC-S2 IN-PROG
ARC SHOT2
ARC-S3 IN-PROG
ARC SHOT3
ARC CLOSE COMMAND
CB ALLPH
Closed
CLOSE
Open
ARC CLOSE SUCCESS
ARC CLOSE FAIL
ARC FT
Figure 2.22-12 Single shot ARC scheme [ARCNUM]=S1 for Permanent fault
Note: As described in Chapter 2.22.4(iii), the permissive signal 'ARC-VCHK' is required
for the ARC SHOT1 operation, but is omitted here for the sake of clarity.
CB fails to be closed.
[TCCW]
)
[TARCSUC]
)
[TCCW]
)
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6F2T0207 (0.01)
GRE200 (5,6)