Toshiba GR200 Series Instruction Manual page 70

Example of Transfer-trip
(ii)
Internal fault on the bus-bar and circuit breaker failure condition on the Line CB
Incident Trip issuing and Operation
Step1 Fault occurrence in zone A of bus-bar
Remote
end
Step2 Operation of Bus-bar protection:
Remote
end
Step3 Operation of CBF Re-trip:
Remote
end
Step4 Operation of CBF Transfer-trip:
Remote
end
Note: CB11 is connected to zone A of the bus-bar.
Failure of CB
CB closed
CB open
CBF re-trip
CBF trip
Scheme logic and setting
2.2.3
'Re-trip', 'Zone-trip' and 'Transfer-trip' commands are instructed with the signal generated in
the TRC function (internal operation). However, the relays outside the busbar relays, such as
Line protection relays, or bus-couplers relays, etc., can also instruct the CH* to issue the
Table 2.2-5 Operation example #3
Busbar Busbar
Zone A Zone B
CB11
CB12
CBC
Busbar Busbar
Zone A Zone B
CB11
CB12
CBC
Busbar Busbar
Zone A Zone B
CB11
CB12
CBC
Busbar Busbar
Zone A Zone B
CB11
CB12
CBC
- 56 -
Comment
A fault occurs in zone A.
CB21
CB22
All CBs connected to zone A
of the bus-bar are tripped.
However, CB11 fails to trip.
CB21
CB22
A CBF Re-trip command is
issued to target CB (CB11).
If tripping of the target CB
(CB11) is successful using
CB21
the CBF Re-trip command,
then operation of the CBF
CB22
protection is complete.
If tripping of the target CB
(CB11) is unsuccessful at
Step 3, a CBF Transfer-trip
command is issued to trip
CB21
the adjacent CB (in this case
the CB
CB22
terminal). Thus, the fault is
successfully
tripping the adjacent CB.
Centralized GRB200
(Soft: 030, 031, 032, 033, 034)
6F2S1931 (0.20)
at the remote
removed by