R.2.8
SEL-421 Relay Reference Manual Date Code 20111215
Auto-Reclosing and Synchronism Check
One-Circuit-Breaker Auto-Reclosing
Active Circuit
Breakers
Two Relay Word bits describe when Circuit Breaker 1 is active for the auto-
reclose logic:
➤ NBK0, No Breaker Active in Reclose Scheme
➤ NBK1, One Breaker Active in Reclose Scheme
NBK1 equals logical 1 when Circuit Breaker 1 is closed and the auto-reclose
logic is reset, or if the auto-reclose logic is in an auto-reclose cycle (79CY1 or
79CY3). NBK0 equals logical 1 when Circuit Breaker 1 is open and not in an
auto-reclose cycle (79CY1 or 79CY3), or if the auto-reclose logic is locked
out (BK1LO).
Enable Auto-Reclose
Logic for One Circuit
Breaker
Three-Pole Trip Circuit Breaker
The initial settings necessary to enable auto-reclose for a single three-pole trip
circuit breaker are shown in Table 2.2.
For additional settings to set specific operating parameters for the recloser,
refer to Auto-Reclose and Synchronism Check Example on page A.1.137.
Single-Pole Trip Circuit Breaker
The initial settings necessary to enable auto-reclose for one single-pole trip
circuit breaker are shown in Table 2.3.
Table 2.2 One-Circuit-Breaker Three-Pole Reclosing Initial Settings
Setting Description Entry
General Global Settings (Global)
NUMBK Number of Breakers in Scheme 1
Breaker Configuration (Breaker Monitor)
BK1TYP Breaker 1 Trip Type 3
Breaker 1 Inputs (Breaker Monitor)
52AA1 N/O Contact Input—BK1 (SELOGIC
®
control equation) IN101
Relay Configuration (Group)
E79 Reclosing Y
Table 2.3 One-Circuit-Breaker Single-Pole Reclose Initial Settings
(Sheet 1 of 2)
Setting Description Entry
General Global Settings (Global)
NUMBK Number of Breakers in Scheme 1
Breaker Configuration (Breaker Monitor)
BK1TYP Breaker 1 Trip Type 1
Breaker 1 Inputs (Breaker Monitor)
52AA1 A-Phase N/O Contact Input—BK1 (SELOGIC Equation) IN101
52AB1 B-Phase N/O Contact Input—BK1 (SEL
OGIC Equation) IN102
52AC1 C-Phase N/O Contact Input—BK1 (SEL
OGIC Equation) IN103
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