Sel 411L - Manual Closing

P.4.40
SEL-411L Relay Protection Manual Date Code 20151029
Autoreclosing and Synchronism-Check
Manual Closing
Figure 4.15 Two Circuit Breakers Three-Pole Cycle State (79CY3) When E79 := Y1 (continued)
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 up to two circuit breakers). The manual close
logic can be user-configured in most any manner with SEL
OGIC settings
BK1MCL and BK2MCL. Figure 4.16 is a flowchart of the manual close logic.
This logic is enabled with Manual Closing enable setting EMANCL := Y.
Figure 4.16 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 4.16
is the substitution of settings and logic outputs (BK2MCL for BK1MCL,
ULCL2 for ULCL1, etc.). A manual close is issued for breaker BK1 if:
➤ 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),
➤ And 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
➤ And the close failure timer starts timing
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; 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)