Toshiba GR200 Series Instruction Manual page 447

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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.

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 2.34-2.

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

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'.

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.

Final trip stage

When the ARC function detects the following conditions, the ARC function goes to 'Final trip'

6F2S1914 (0.49)

GRL200 (Soft 033 & 037)

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