Schweitzer Engineering SEL-351P, Quick Start Manual

Page: 301 / 674

Date Code 990215 Close and Reclose Logic 6-7
SEL-351P Manual Técnico
Settings and General Operation
Figure SECTION 6: .2 contains the following SEL
OGIC
Control Equation setting:
79CLS (reclose supervision conditions – checked after reclosing relay open interval time-
out)
and setting:
79CLSD (Reclose Supervision Limit Time)
See the settings sheets at the end of Section 9: Setting the SEL-351P Recloser Control for
setting ranges.
Reclose Supervision Limit Time = 0 (top of Figure SECTION 6: .2)
79CLSD = 0.00
With this setting, the logic in the top of Figure SECTION 6: .2 is operative. When an open
interval times out, the SEL
OGIC
Control Equation reclose supervision setting 79CLS is checked
just once.
If 79CLS is asserted to logical 1 at the instant of an open interval time-out, then the now-
qualified open interval time-out will propagate onto the final close logic in Figure SECTION 6:
.1 to automatically reclose the circuit breaker.
If 79CLS is deasserted to logical 0 at the instant of an open interval time-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.
See the previous Factory Settings Example and Additional Settings Example 1 that follow in
this subsection.
Reclose Supervision Limit Time > 0 (bottom of Figure SECTION 6: .2 and
Figure SECTION 6: .3)
e.g., 79CLSD = 60.00
With this setting, the logic in the bottom of Figure SECTION 6: .2 is operative. When an open
interval times out, the SEL
OGIC
Control Equation reclose supervision setting 79CLS is then
checked for a time window equal to setting 79CLSD.
If 79CLS asserts to logical 1 at any time during this 79CLSD time window, then the now-
qualified open interval time-out will propagate onto the final close logic in Figure SECTION 6:
.1 to automatically reclose the circuit breaker.