Schweitzer Engineering Laboratories SEL-421-4 - Page 1018

6.42
SEL-400 Series Relays Instruction Manual Date Code 20171006
Autoreclosing
Manual Closing
Figure 6.17 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 ?)
Deassert 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 Similar 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