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Date Code 990215 Close and Reclose Logic 6-1
SEL-351P Manual Técnico
SECTION 6: CLOSE AND RECLOSE LOGIC
This section is made up of three subsections:
Close Logic
This subsection describes the final logic that controls the close output. This output
closes the recloser for automatic reclosures and other close conditions (e.g., manual
close initiation via serial port or optoisolated inputs).
If automatic reclosing is not needed, but the SEL-351P Recloser Control is to close the
circuit breaker for other close conditions (e.g., manual close initiation via serial port or
optoisolated inputs), then this subsection is the only subsection that needs to be read in
this section (particularly the description of SEL
OGIC
®
Control Equation setting CL).
Reclose Supervision Logic
This subsection describes the logic that supervises automatic reclosing when an open
interval time times out – a final condition check right before the close logic asserts the
close output contact.
Reclose Logic
This subsection describes all the reclosing relay settings and logic needed for automatic
reclosing (besides the final close logic and reclose supervision logic described in the
previous subsections).
The reclose enable setting, E79, has setting choices N, 1, 2, 3, and 4. Setting E79 = N
defeats the reclosing relay. Setting choices 1 through 4 are the number of desired
automatic reclosures.
Note: Setting E79 = N defeats the reclosing relay, but does not defeat the ability of the
close logic described in the first subsection (Figure SECTION 6: .1) to close
the circuit breaker for other close conditions via SEL
OGIC
Control Equation
setting CL (e.g., manual close initiation via serial port or optoisolated inputs).
C
LOSE
L
OGIC
The close logic in Figure SECTION 6: .1 provides flexible circuit breaker closing/automatic
reclosing with SEL
OGIC
Control Equation settings:
52A (breaker status)
CL (close conditions, other than automatic reclosing)
ULCL (unlatch close conditions, other than circuit breaker status, close failure, or
reclose initiation)
and setting:
CFD (Close Failure Time)
See the settings sheets in Section 9: Setting the SEL-351P Recloser Control for setting ranges.