Sel SEL-421 - Manual Close Logic

R.2.43
Date Code 20111215 Reference Manual SEL-421 Relay
Auto-Reclosing and Synchronism Check
Manual Closing
Figure 2.16 Manual Close Logic
START
Manual Close Logic Enabled?
EMANCL := Y
Assert Close Output
(BK1CL := 1)
Load Breaker Close Failure Timer
With Value of BKCFD
Unlatch Close Output?
(ULCL1 := 1 ?)
De-assert Close Output
(BK1CL := 0)
END
Number of Breakers
in Scheme?
NUMBK := ?
Decrement Breaker
Close Failure Timer
Assert Breaker Close
Failure output
(BK1CFT := 1)
Breaker BK1Y
Y
N
Y
Y
N
N
N
1
Breaker BK2
From Breaker BK2 logic
Breaker 2 Manual Close Logic Similiar to Breaker 1
Breaker Close Failure
Timer Timed Out ?
New Manual Close signal
and
No Unlatch Close Condition
and
No Close in Progress?
(BK1MCL and Not (ULCL1)
and Not (BK1CL))
2