Toshiba GR-200 Series Instruction Manual page 255

stage.
Multi shot scheme (signals 'ARC SHOT2–5')
(vi)
Signals 'ARC SHOT2' to 'ARC SHOT5' may be issued after the 'ARC SHOT1' signal when a
persistent fault occurs.
Dead time (delay timers TSHOT, TSHOT_SUB, and TD_MS2–5)
(vii)
The dead time is the time interval from relay operation i.e. the initiation of the auto-reclose
scheme, to the inception of the 'ARC CLOSE COMMAND' used to energize the circuit breaker
closing circuit and is provided by delay timer [TSHOT]. A substitute delay timer [TSHOT_SUB]
is also available when the user wishes to program the inception of the 'ARC SHOT1' signal
using the PLC function instead of [TSHOT], this feature is only provided in the event that the
user wishes to replace the original logic.
The dead times for sequential operation of the autoreclose scheme 'ARC SHOT2' to 'ARC
SHOT5', are provided by delay timers [TD_MS2]–[TD_MS5], respectively.
Pulse width of 'ARC CLOSE COMMAND' (setting TCCW)
(viii)
An 'ARC CLOSE COMMAND' signal is issued after the dead time. Setting [TCCW] is used to
define the pulse-widths of the reclosing commands for respective shot1–5.
Final trip stage to abandon CB reclosure (signal 'ARC FT' and setting
(ix)
TRR)
TRR is the time interval from the initiation of an ARC to abandoning the issue of 'ARC SHOT1'.
That is, the permissive signal 'ARC-VCHK1' must be issued by the VCHK function within the
time interval of TRR at the end of the dead time (i.e. TRR has not timed out), otherwise the
ARC function abandons the reclosure of the CB. That is, if TSHOT has timed out and the 'ARC-
VCHK1' permissive signal has not been issued within TRR time, the TRR signal ends up in
'Final Trip (FT)'. Note that the timer setting of the [TRR] timer should be set greater than that
applied to the dead time delay timer [TSHOT] to ensure that the dead time has fully expired,
see 2.22.4(iii).
Reset for tripping failure (signal 'ARC RESET' and setting TRESET)
(x)
Subsequent to the reception of the 'GEN.TRIP' signal, a check is required to determine whether
the CB has opened. If the CB has not opened within the time setting of timer [TRESET], then
"CB fail to open" is indicated by the 'ARC RESET' signal, which also resets the operation of the
ARC. The duration of the setting applied to the [TRESET] timer must be less than the setting
applied to the ARC dead time delay timers (e.g. [TSHOT]).
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6F2T0200 (0.15)
GRE200 (1,2)