Sel SEL-421 - Page 206

R.2.38
SEL-421 Relay Reference Manual Date Code 20111215
Auto-Reclosing and Synchronism Check
Auto-Reclose Logic Diagrams
Figure 2.14 Two Circuit Breakers Three-Pole Cycle State (79CY3) When E79 := Y (continued)
D
12
3
6
9
Is 79BRCT Asserted?
Determine
Active Breakers
Determine Leader
Timing
3PARC
3PARC
To Beginning
of 79CY3
*Send Breakers (not already
in the Lockout State; 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)