6.40
SEL-400 Series Relays Instruction Manual Date Code 20171006
Autoreclosing
Manual Closing
Manual Closing
Manual closing is available via the relay to issue a close to the circuit breaker(s)
via the same close logic outputs used in autoreclosing (Relay Word bits BK1CL
and BK2CL for as many as two circuit breakers). The manual close logic can be
user-configured in most any manner with SEL
OGIC settings BK1MCL and
BK2MCL. Figure 6.17 is a flowchart of the manual close logic. This logic is
enabled with Manual Closing enable setting EMANCL := Y.
Figure 6.17 only details the manual close logic for one circuit breaker (breaker
BK1). The manual close logic for a second circuit breaker (breaker BK2), if
enabled (Global setting NUMBK := 2), is similar. The only difference between
the breaker BK1 and breaker BK2 manual close logic in Figure 6.17 is the substi-
tution of settings and logic outputs (BK2MCL for BK1MCL, ULCL2 for
ULCL1, etc.). A manual close is issued for breaker BK1 if all of the following are true:
➤ A new manual close signal for breaker BK1 is detected (rising edge
assertion of SEL
OGIC setting BK1MCL)
➤ No unlatch close conditions are present (SELOGIC setting ULCL1
deasserted)
➤ No close is presently in progress for breaker BK1 (Relay Word bit
output BK1CL is deasserted)
If a manual close is successfully issued for breaker BK1, then:
➤ Close logic output BK1CL asserts
➤ The close failure timer starts timing
Figure 6.16 Two Circuit Breakers Three-Pole Cycle State (79CY3) When E79 := Y1 (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)
To Next Page
Loading...
