Sel 411L - Table 4.13 Leader;Follower Selection; Table 4.14 Example Three: Reset State; Table 4.15 Example Three: Three-Pole Cycle State

P.4.21
Date Code 20151029 Protection Manual SEL-411L Relay
Autoreclosing and Synchronism-Check
Two-Circuit-Breaker Autoreclosing
Example Three: BK2 as Conditional Follower
One method to program BK2 for closing only after a successful BK1 close is
to set SLBK1/SLBK2/FBKCEN as in Table 4.13.
Reset State
Prior to receiving initiation for a three-phase fault, the autoreclose logic resets
for both circuit breakers. Table 4.14 defines the logical state of the autoreclose
logic for this example prior to the initiation of an autoreclose cycle.
79CY3 Cycle State
The autoreclose logic receives a three-pole initiation. Table 4.15 defines the
logical state of the autoreclose logic for this example during the three-pole
autoreclose cycle.
BK2 closes as the follower when BK1 successfully closes (after timer
TBBKD).
Table 4.13 Leader/Follower Selection
Setting Label Value
SLBK1 1
SLBK2 0
FBKCEN 52AA1
Table 4.14 Example Three: Reset State
Relay Word Bit Description Logical State
NBK0 No Active Breakers in Reclose Scheme 0
NBK1 One Breaker Active in Reclose Scheme 0
NBK2 Two Active Breakers in Reclose Scheme 1
LEADBK0 No Leader Breaker 0
LEADBK1 Leader Breaker = Breaker 1 1
LEADBK2 Leader Breaker = Breaker 2 0
FOLBK0 No Follower Breaker 0
FOLBK1 Follower Breaker = Breaker 1 0
FOLBK2 Follower Breaker = Breaker 2 1
Table 4.15 Example Three: Three-Pole Cycle State
Relay Word Bit Description Logical State
NBK0 No Active Breakers in Reclose Scheme 0
NBK1 One Breaker Active in Reclose Scheme 0
NBK2 Two Active Breakers in Reclose Scheme 1
LEADBK0 No Leader Breaker 0
LEADBK1 Leader Breaker = Breaker 1 1
LEADBK2 Leader Breaker = Breaker 2 0
FOLBK0 No Follower Breaker 0
FOLBK1 Follower Breaker = Breaker 1 0
FOLBK2 Follower Breaker = Breaker 2 1