Date Code 990215 Close and Reclose Logic 6-21
SEL-351P Manual Técnico
If a 52b breaker auxiliary contact is connected to input IN101 (52A = !IN101), the
reclose initiate setting (79RI) remains the same.
2. If no reclose initiate supervision is desired, make the following setting:
79RIS = 1 (numeral 1)
Setting 79RIS = logical 1 at all times. Any time a logical 0 to logical 1 transition is detected
by setting 79RI, open interval timing will be initiated (unless prevented by other means).
3. If the following setting is made:
79RI = 0 (numeral 0)
reclosing will never take place (reclosing is never initiated). The reclosing relay is effectively
inoperative.
4. If the following setting is made:
79RIS = 0 (numeral 0)
reclosing will never take place (the reclosing relay goes directly to the lockout state any time
reclosing is initiated). The reclosing relay is effectively inoperative.
Drive-to-Lockout and Drive-to-Last Shot Settings (79DTL and 79DLS, respectively)
When 79DTL = logical 1, the reclosing relay goes to the Lockout State (Relay Word bit
79LO = logical 1), and the front-panel Lockout LED illuminates.
79DTL has a 60-cycle dropout time. This keeps the drive-to-lockout condition up 60 more
cycles after 79DTL has reverted back to 79DTL = logical 0. This is useful for situations where
both the following are true:
• any of the trip and drive-to-lockout conditions are “pulsed” conditions (e.g., the OPEN
Command Relay Word bit, OC, asserts for only a ¼ cycle - see Figure 1.25)
• reclose initiation is by the breaker contact opening (e.g., 79RI = !52A - see Additional
Settings Example in the preceding setting 79RI [reclose initiation] discussion.
Then the drive-to-lockout condition overlaps reclose initiation and the SEL-351P stays in lockout
after the breaker trips open.
When 79DLS = logical 1, the reclosing relay goes to the last shot, if the shot counter is not at a
shot value greater than or equal to the calculated last shot (see Reclosing Relay Shot Counter
earlier in this subsection).
Factory Settings Example
The drive-to-last shot factory setting is:
79DLS = 79LO
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