Toshiba GR 200 Series, Instruction Manual

Page: 372 / 1563

6F2S1915 (0.46)
GRZ200 (Soft 031 & 032)
- 351 -
2.24.4
Timing diagram
(i)
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).
Relay operation
GEN.TRIP
ARC1 IN-PROG
ARC1-S1 IN-PROG
ARC1 SHOT1
Dead Time [ TTPAR1 ]
)
ARC1 CLOSE COMMAND
[ TCCW1 ]
)
CB#1 status
Closed
Open
ARC1 CLOSE SUCCESS
ARC1 CLOSE FAIL
CB1_ ALLPH_CLOSE
Fault current
ARC1 FT
ARC1-S2 IN-PROG
ARC1 SHOT2
ARC1-S3 IN-PROG
ARC1 SHOT3
20ms
)
Operated
Issued
Closed
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
].
(ii)
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.