Date Code 20010625
Close and Reclose Logic
6-13
SEL-311L Instruction Manual
Lockout State
The reclosing relay goes to the Lockout State if any one of the following occurs:
•
The shot counter is equal to or greater than the last shot at the time of reclose initiation
(e.g., all automatic reclosing attempts are unsuccessful—see Figure 6.6).
•
Reclose initiation is unsuccessful because of SEL
OGIC
control equation setting 79RIS
(see
Reclose Initiate and Reclose Initiate Supervision Settings [79RI and 79RIS,
Respectively]
later in this subsection).
•
The circuit breaker opens without reclose initiation (e.g., an external trip).
•
The shot counter is equal to or greater than last shot, and the circuit breaker is open
(e.g., the shot counter is driven to last shot with SEL
OGIC
control equation setting
79DLS while open interval timing is in progress. See
Drive-to-Lockout and
Drive-to-Last Shot Settings [79DTL and 79DLS, Respectively]
later in this subsection).
•
The close failure timer (setting CFD) times out (see Figure 6.1).
•
SEL
OGIC
control equation setting 79DTL = logical 1 (see
Drive-to-Lockout and
Drive-to-Last Shot Settings [79DTL and 79DLS, Respectively]
later in this subsection).
•
The Reclose Supervision Limit Timer (setting 79CLSD) times out (see Figure 6.2 and
top of Figure 6.3).
The OPEN (
OPE
) command can be included in the reclosing relay logic via SEL
OGIC
control
equation settings. For example:
79DTL = … + OC
(drive-to-lockout)
Relay Word bit OC asserts for execution of the
OPE
command. See
OPE Command (Open
Breaker)
in
Section 10: Line Current Differential Communications and Serial Port
Communications and Commands
for more information on the
OPE
command. Also, see
Drive-
to-Lockout and Drive-to-Last Shot Settings (79DTL and 79DLS, Respectively)
later in this
subsection.
If the
OPE
command is set to trip (TR = … + OC), then the following reclosing relay SEL
OGIC
control equation settings should also be made (presuming that an
OPE
command trip should not
initiate reclosing):
79RI = TRIP + TRIP87
(reclose initiate)
79DTL = … + OC
(drive-to-lockout)
Reclosing Relay States After a Settings or Setting Group Change
If individual settings are changed for the active setting group or the active setting group is
changed, all of the following occur:
•
The reclosing relay remains in the state it was in before the settings change.
•
The shot counter is driven to last shot (last shot corresponding to the new settings; see
discussion on last shot that follows).
•
The reset timer is loaded with reset time setting 79RSLD (see discussion on reset timing
later in this section).
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