Sel SEL-421 - One Circuit Breaker Single-Pole Cycle State (79 CY1)

R.2.30
SEL-421 Relay Reference Manual Date Code 20111215
Auto-Reclosing and Synchronism Check
Auto-Reclose Logic Diagrams
Figure 2.10 One Circuit Breaker Single-Pole Cycle State (79CY1)
Yes
79CY3
79DTL
3POLINE
3PARC
3PARC
SPARC
Wait for
Breaker
to Open
Single Pole
Open Interval
(SPOID)
79CY1
Is Breaker Allowed
to Close (SP1CLS)?
SPO
Single Pole
Open Time Out
No
Timed
Out
Single Pole
Reclaim Time
(SPRCD)
Breaker Close
Failure Time
(BKCFD)
Ready State
(BK1RS)
to Beginning
of 79CY3
to Beginning
of 79CY1
Lockout
(BK1LO)
3PARC
SPARC
Timed Out
Timing
No
Lockout
(BK1LO)
Lockout
(BK1LO)
Timed Out
Timing
Issue CLOSE
Command (BK1CL)
Did Breaker Close?
BK1CL
12
3
6
9
12
3
6
9
12
3
6
9
12
3
6
9
12
3
6
9
Recalculate NBKn,
Leader, and Follower
Is 79BRCT Asserted?
Timing
No
Yes
79CY3
SPARC
3PARC
Yes
Close Supervision
Delay (BK1CLSD)