Sel 751A - Figure 4.32 Reclose Supervision Limit Timer Operation

4.55
Date Code 20100129 Instruction Manual SEL-751A Relay
Protection and Logic Functions
Reclose Supervision Logic
Figure 4.32 Reclose Supervision Limit Timer Operation
(Refer to Bottom of Figure 4.31)
Settings and General
Operation
Figure 4.31 contains the following SELOGIC control equation setting:
79CLS (reclose supervision conditions—checked after reclosing relay
open interval time-out)
and setting:
79CLSD (Reclose Supervision Limit Time)
See the Tabl e 4. 2 7 for Recloser Control settings.
For Most Applications (Top of Figure 4.31)
For most applications, the Reclose Supervision Limit Time setting should be
set to zero seconds:
79CLSD := 0.00
With this setting, the logic in the top of Figure 4.31
is operative. When an
open interval times out, the SEL
OGIC control equation reclose supervision
setting 79CLS is checked just once.
open interval 1
times out
open interval 1
times out 1
Open Interval
Timer
Open Interval
Timer
Reclose Supervision
Limit Timer
Reclose Supervision
Limit Timer
79CLS (Reclose
Supervision Condition)
79CLS (Reclose
Supervision Condition)
RCSF (Reclose
Supervision Failure)
RCSF (Reclose
Supervision Failure)
OUT102 = CLOSE
(Close Output Contact)
OUT102 = CLOSE
(Close Output Contact)
79OI1
79OI1
79CLSD
79CLSD
One Processing
Interval
79CLS not asserted.
79CLSD times out.
79CLS asserts before
79CLSD times out.
No Reclosing
Reclosing Proceeds