Schweitzer Engineering Laboratories SEL-421-4 - Page 1013

6.37
Date Code 20171006 Instruction Manual SEL-400 Series Relays
Autoreclosing
Autoreclose Logic Diagrams
Figure 6.15 Two Circuit Breakers Three-Pole Cycle State (79CY3) When E79 := Y (Continued)
D
12
3
6
9
Is 79BRCT Asserted?
Recalculate NBKn,
Leader, and Follower
Determine
Active Breakers
Determine Leader
Timing
3PARC
3PARC
To beginning
of 79CY3
*Send Breakers (not already
in the Lockout State, e.g., BKnL0)
to the Reset State (BKnRS)
Breaker #1
Ready State (BK1RS)
Breaker #2
Ready State (BK2RS)
No
Yes
NBK1
LEADBK1
LEADBK2
NBK2
Timed Out
Reclaim Timer
(3PRCD)
Breaker Open
Lockout
(BKnLO)