Description of Operation
GARD 8000 Distance Relay
RFL Electronics Inc.
9.23.3
RECLOSING LOGIC
Figure 8-67 depicts the flow diagram for the recloser operation. Figure 8-68 shows the block diagram
of the recloser lockout.
Lock-out for
Definite Trip
Lock-out for Open
Breaker
CC = Reclose cycle in progress
n = index number of reclose attempt
N = number of set reclose attempts
SIR = reclose initiate
Reset
CC = 0
n = 0
Start Time
SIR - Reclose Initiate
52b = 1
TRIP = 0
TRIP = 1
SIR = 0
Lock-out for Start
Time failure
SIR = 1
TRIP = 1
52b = 0
CC = 1
SIR = 0
TRIP = 0
52b = 1
Recl. Cycle Time (n)
Sync check
supervision (n)?
Sync = 1
Yes
Sync wait time
(n)?
No
Sync wait timer (n)
Yes
Lock-out for lack of
sync
No
Sync = 0
Recl = 1
No
Sync = 1
Fail to close time
Recl = 0
52b = 0
Lock-out for
lack of sync
Security time
Lock-out for
definite trip
n = N
Lock-out for
open breaker
52b = 1
Yes
SIR = 1
n < N
n = n + 1
Figure 9-67. Reclosing Mode
August 1, 2009
9-78
973.334.3100
