Toshiba GR200 Series Instruction Manual page 82

Re-trip and Zone-trip in series initiation
(iv)
The CBF re-trip and the Zone-trip can be initiated in series using scheme switch [CBF-
Trip_CH*] setting On-AftRe.
For series initiation, the timers settings using [TCBF-RE_CH*] and [TCBF-ZONE_CH*]
are initiated in series from a trip signal, as shown in the below figure.
If the target CB has failed to clear a fault following operation of a trip relay and if the
subsequent re-trip has been unsuccessful the OCCBF relay will continue to operate. As a result,
after expiration of the CBF Zone-trip time delay a CBF Zone-trip command is issued to initiate
the tripping of all other circuit breakers connected to the same busbar; the CBF Zone-trip is
completed by tripping the adjacent CB(s). Issue of the back-trip command and the receipt of
back-tripping signals by individual circuit breakers is executed through the busbar replica.
Where the protection system is associated with a feeder circuit breaker, an initiation may also
be provided to send an intertrip signal to directly connected remote circuit breakers(s).
The timer setting using [TCBF-ZONE_CH*] starts after the set time [TCBF-RE_CH*] has
elapsed, and the CBF Zone-trip command is issued.
Fault
Fault current
Closed
Adjacent CB
Open
Closed
Target CB
Open
GEN.TRIP signal
OCCBF_CH* relay
Re-trip
Zone-trip
Figure 2.2-10 Timing chart in series mode (Adjacent CB(s) tripped by CBF re-trip and zone-trip)
Unsuccessful
Timer set with [TCBF-RE_CH*]
Unsuccessful
Timer set with [TCBF-ZONE_CH*]
- 68 -
6F2S1931 (0.20)
TCB
TOC
Centralized GRB200
(Soft: 030, 031, 032, 033, 034)