Advertisement
Decision time for ARC successful operation or failure (setting
(xi)
TARCDSUC and signal 'ARC CLOSE FAIL')
The [TARCDSUC] timer provides the following functionality depending on the setting of
scheme switch [ARC-SucChk].
Scheme switch [ARC-SucChk]=On
With [ARC-SucChk] set to On, timer [TARCDSUC] is used to define the checkpoint at which
the CB is closed successfully after issuing the 'ARC CLOSE COMMAND' signal following
which, an 'ARC CLOSE SUCCESS' signal is issued. If the CB fails to close within the setting
of timer [TARCDSUC], an 'ARC CLOSE FAIL' signal is issued and the ARC function moves to
the 'Final trip (FT)' stage.
Successful reclosure of the CB (subsequent to fault clearance) is checked by the 'Success
check' logic, which checks for the signal 'CB-ALLPH-CLOSE' provided by the protection
common function (PROT_COMMON). Clearing the fault automatically resets the ARC
operation.
Scheme switch [ARC-SucChk]=Off
With [ARC-SucChk] set to Off, timer [TARCDSUC] may be used to check for a successful
closure following the issue of the 'ARC SHOT' command. The 'ARC SHOT RS' signal is
generated which is used for resetting the ARC function.
Note: a CB failure to close condition will not be detected by this logic. The user will have
to incorporate this check externally.
Progress of ARC operation (signals 'ARC IN-PROG' and 'ARC
(xii)
START')
Information regarding the progress of an ARC operation is provided following the reception of
the 'GEN.TRIP' signal as follows:
Entire ARC progress for all shots (signal 'ARC IN-PROG')
The 'ARC IN-PROG' signal is defined as the time interval from issuing the first 'GEN.TRIP' to
the confirmation of the ARC successful operation or the final trip.
Respective progress for respective shots (signal 'ARC* IN-PROG')
Respective signals 'ARC* IN-PROG' are defined for the operation of respective shots.
Trigger for ARC operation (signal 'ARC_START')
The 'ARC_START' signal indicates the instant at which the 'GEN.TRIP' signal is issued
- 236 -
6F2T0207 (0.01)
by the
GRE200 (5,6)
Advertisement
