Toshiba GR 200 Series, Instruction Manual

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6F2S1915 (0.46)
GRZ200 (Soft 031 & 032)
- 337 -
(i.e., [
ARC-ORDER
]=
SIMUL
).
(iii)
User configurable autoreclose ( Setting [ ARC1-MODE ]= Original)
In the user configurable auto reclose mode (ORIGINAL), the user can manage the scheme of
the ARC procedure and it allows the user program the ARC function by the PLC function.
(iv)
Number of reclosing shots
Single-shot autoreclose (Setting [ ARC-NUM ]= S1 in 1CB)
In single-shot autoreclose scheme, autoreclose is performed only once. If the fault cannot be
cleared after reclosing, the ARC function reaches final tripping stage (ARC1 FT) and the ARC
function instructs the TRC to make three-phase tripping (94CB1_TT). The first shot (ARC1
SHOT1) is just issued when setting [
ARC-NUM
]=
S1
, as described in Table 2.24-2.
Multi-shot autoreclose (Setting [ ARC-NUM ]= S2/S3/S4/S5 in 1CB)
Any of the two-shot (
S2
) to five-shot (
S5
) reclosing can be selected in multi-shot autoreclose
scheme. Successive shots (ARC1 SHOT2 to ARC1 SHOT5) are three-phase tripping and
reclosing, if the first shot (ARC1 SHOT1) fails. For ‘ARC1 SHOT2’ to ‘ARC1 SHOT5’, which
are applied in three-phase reclosure, the user shall introduce a permission signal by PLC
programming or the voltage and synchronism check signal. Closing status of the CB main
contact can be monitored in the PROT_COMM function; the ARC function can evaluate the
successful reclosing-operation after issuing the shots (ARC1 SHOT1 and others). A failure
(ARC1 CLOSE FAIL) is signaled if the CB#1 fails to close after issuing the ‘ARC1 SHOT1 and
others’.
Signle-shot autoreclose (Setting [ ARC-NUM ]= S1 in 1.5CB)
Note that multi-shot autoreclose will not be applied in the 1.5CB busbar arrangement. The
first shot (ARC1 SHOT1/ARC2 SHOT) is just issued for the CB#1 and the CB#2. Closing status
of the CB#1 and CB#2 main contacts can be monitored in the PROT_COMM function; the ARC
function issues a failure signal (ARC1 CLOSE FAIL or ARC2 CLOSE FAIL) if a CB fails to
close after issuing the ‘ARC1 SHOT1’ or ‘ARC2 SHOT’.
(v)
Operation failure in tripping CB
A check is required to determine whether the CB have been tripped to open properly when the
relay applications detect the fault. If the CB cannot open within the required time, a failure
signal “CB fail to open” is indicated; the ARC function resets the reclose operation of the CB
and a shot is not issued.
(vi)
Final trip stage
When the ARC function detects the following conditions, the ARC function goes to ‘Final trip’