Toshiba GR-200 Series Instruction Manual page 266

Multi functional protection ied

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Single shot scheme for an Arcing fault; fault removed by a backup

Figure 2.22-13 shows the single shot scheme for an Arcing fault, but tripping is not executed

due to the failure of the CB. Therefore, the operation of the ARC function is reset in the setting

time [TRESET] before the duration of dead timer [TSHOT] expires. Consequently, the ARC

function determines that the local CB cannot be tripped to clear the fault.

Fault current

Relay operation

ARC-S1 IN-PROG

ARC-S2 IN-PROG

ARC-S3 IN-PROG

ARC CLOSE COMMAND

ARC CLOSE SUCCESS

ARC CLOSE FAIL

Figure 2.22-13 Single shot scheme [ARCNUM]=S1 for an Arcing fault; remote CB† tripped

†Note: the fault is removed by the tripping of the CB at the remote end; hence, the fault

current will no longer flow.

Multi shot scheme for Permanent fault

Figure 2.22-14 illustrates the multi-shot scheme (S3); triple reclosing of the CB by the ARC

function is required and executed correctly. However, the ARC function determines that the

fault is permanent as the fault persists after the third tripping (i.e. the shot counter logic

reaches its maximum value and the fault persists). Consequently, the ARC function moves to

the final trip (FT) stage so that the ARC will not issue an 'ARC CLOSE COMMAND' signal

Fault cleared by tripping the backup CB at the remote end†

CB at the local end fails to open

Dead time [TSHOT1]

6F2T0200 (0.15)

GRE200 (1,2)

Chapters

Gre200-1 Gre200-2