Schweitzer Engineering SEL-351P - Set Reclose Supervision Logic (Bottom of Figure 6.2); Unlatch Reclose Supervision Logic (Bottom of Figure 6.2)

6-8 Close and Reclose Logic Date Code 990215
SEL-351P Manual Técnico
If 79CLS remains deasserted to logical 0 during this entire 79CLSD time window, when the time
window times out, the following occurs:
• No automatic reclosing takes place.
• Relay Word bit RCSF (Reclose Supervision Failure indication) asserts to logical 1 for
one processing interval.
• The reclosing relay is driven to the Lockout State.
The logic in the bottom of
Figure SECTION 6: .2 is explained in more detail in the following
text.
Set Reclose Supervision Logic (bottom of
Figure SECTION 6: .2)
Refer to the bottom of
Figure SECTION 6: .2. If all the following are true:
• The close logic output CLOSE (also see
Figure SECTION 6: .1) is not asserted (Relay
Word bit CLOSE = logical 0)
• The reclosing relay is not
in the Lockout State (Relay Word bit 79LO = logical 0).
• The circuit breaker is open (52A = logical 0)
• The reclose initiation condition (79RI) is not
making a rising edge (logical 0 to
logical 1) transition
• The Reclose Supervision Limit Timer is not
timed out (Relay Word bit RCSF =
logical 0)
then a reclosing relay open interval time-out seals. Then, when 79CLS asserts to logical 1, the
sealed-in reclosing relay open interval time-out condition will propagate through
Figure SECTION 6: .2 and on to the close logic in Figure SECTION 6: .1.
Unlatch Reclose Supervision Logic (bottom of
Figure SECTION 6: .2)
Refer to the bottom of
Figure SECTION 6: .2. If the reclosing relay open interval time-out
condition is sealed-in, it stays sealed-in until one
of the following occurs:
• The close logic output CLOSE (also see
Figure SECTION 6: .1) asserts (Relay Word
bit CLOSE = logical 1).
• The reclosing relay goes to the Lockout State (Relay Word bit 79LO = logical 1).
• The circuit breaker closes (52A = logical 1).
• The reclose initiation condition (79RI) makes a rising edge (logical 0 to logical 1)
transition.
• SEL
OGIC Control Equation setting 79CLS asserts (79CLS = logical 1).
• Or the Reclose Supervision Limit Timer times out (Relay Word bit RCSF = logical 1 for
one processing interval).
The unlatching of the sealed-in reclosing relay open interval time-out condition by the assertion
of SEL
OGIC Control Equation setting 79CLS indicates successful propagation of a reclosing
relay open interval time-out condition on to the close logic in
Figure SECTION 6: .1.
See Settings Example 2
that follows in this subsection.