Toshiba GR200 Series Instruction Manual page 372

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Timing diagram

Single shot scheme for an Arcing fault (Shot1 for CB#1 and

successful operation in TPAR mode)

Figure 2.24-5 illustrates an example for which the single shot scheme has been selected (i.e.

[ARCNUM]=S1); an arcing fault is cleared following the operation of the protection relay and

the issue of the 'GEN.TRIP-A/B/C' signals for the tripping of the CB#1. The 'GEN.TRIP-A/B/C'

also initiates the ARC function and an 'ARC1 CLOSE COMMAND' signal is issued following

the expiration of the dead time set for [TTPAR1]. When On is set for [ARC-SucChk], this

scheme will determine that the ARC1 was successful when the 'CB1 ALLPH CLOSE' signal is

detected following the issuing of the 'ARC1 CLOSE COMMAND' signal; the operation of the

ARC function is reset if it operates successfully (i.e., the 'ARC1 IN-PROG' signal is turned off).

Fault current

Relay operation

ARC1 IN-PROG

ARC1-S1 IN-PROG

Dead Time [TTPAR1]

ARC1-S2 IN-PROG

ARC1-S3 IN-PROG

ARC1 CLOSE COMMAND

CB1_ ALLPH_CLOSE

ARC1 CLOSE SUCCESS

ARC1 CLOSE FAIL

Figure 2.24-5 Single shot scheme [ARC-NUM]=S1 for an Arcing fault; operation is successful

Note: The permissive signal 'ARC1-VCHK' is required in the TPAR mode, but is omitted

here for the sake of clarity. The pulse width of the 'ARC1 CLOSE COMMAND'

signal is defined using the setting [TCCW1].

Single shot scheme for an Arcing fault; CB#1 fails to reclose

Figure 2.24-6 also shows the single shot scheme. However, the CB#1 fails to reclose on

receiving the 'ARC1 CLOSE COMMAND' so that the ARC function initiates the 'ARC1 CLOSE

FAIL' signal within the setting time [TARCDSUC]. Consequently, the ARC function goes to the

final trip (ARC1 FT) stage so that the ARC will not issue another 'ARC1 CLOSE COMMAND'

signal hereafter.

6F2S1915 (0.46)

GRZ200 (Soft 031 & 032)