Toshiba GR200 Series Instruction Manual page 452

Respective signals 'ARC1-S* IN-PROG' are defined for the operation of respective shots. A
common 'ARC1 IN-PROG OR' is also issued.
Trigger for the ARC operation (signal 'ARC_START')
The 'ARC_START' signal shows the instant at which 'GEN.TRIP-A/B/C' signals are given from
the TRC function. If an external relay can generate the 'ARC_START' signal, the user can use
it by programing the binary input circuit (BI) in the PLC function.
Tripped phases (signals 'TRIP-ANYPH', 'TRIP-1PH', 'TRIP-MPH', 'TRIP-3PH')
Start logic also decides whether the trip mode is single-phase, multi-phase or three-phases.
These signals are used for issuing ARC1 SHOT1 in SPAR/TPAR/MPAR modes.
Reclaim timer (Setting 'TREADY')
(xiii)
Certain considerations are required to ensure that the ARC function is ready for the next cycle
of operation; the reclaim timer 'TREADY' is provided within the ARC function to accommodate
this requirement. When a CB is closed for the first time subsequent to the maintenance of a
distribution line, the closure would normally be expected to be successful (that is, the CB is
closed on to a healthy line). Then the minimum time setting of the [TREADY] reclaim timer
should be longer than the time required to judge that the CB has closed successfully.
Another consideration required for this setting is that after the CB has gone through a
successful ARC cycle; the maximum allowable successive close-open operations are achieved
with the setting. In this case, the minimum time delay required before the CB is ready for the
next ARC cycle becomes the setting criteria for the [TREADY] timer.
Where the incidence of recurrent lightning strikes is experienced, a shorter reclaim time
will prevent the ARC function going into an unnecessary lock out. On the other hand, caution
is required when considering the exposure of the CB to an excessive number of ARC cycles
caused by recurrent faults which will result in an increase in the frequency of the maintenance
cycle.
In summary, the time required for the CB to be ready for the next cycle of ARC is the minimum
setting that can be applied to the reclaim timer [TREADY] in the ARC function.
CB bridge (Signal 'CB1_BRIDGE')
(xiv)
The 'CB1_BRIDGE' signal is thrown into the TRC function when the ARC1 logic fails to be
'Ready condition'. The 'CB1_BRIDGE' signal ensures three-phase tripping in the CB#1 when
a per-phase trip signal is provided in the TRC function.
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6F2S1914 (0.49)
GRL200 (Soft 033 & 037)