R.2.24
SEL-421 Relay Reference Manual Date Code 20111215
Auto-Reclosing and Synchronism Check
Two-Circuit-Breaker Auto-Reclosing
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 Breakers
The initial settings necessary to enable auto-reclose for two single-pole trip
circuit breakers are shown in Table 2.20.
For additional settings to set specific operating parameters for the recloser,
refer to Auto-Reclose and Synchronism Check Example on page A.1.137.
Recloser Mode
Enables
The SELOGIC control equations E3PRn and ESPRn set the SEL-421 for the
three auto-reclose modes. Table 2.21 and Table 2 .2 2 illustrate how to enable
the auto-reclose modes per circuit breaker.
Table 2.19 Two-Circuit-Breaker Three-Pole Reclose Initial Settings
Setting Description Entry
NUMBK Number of Breakers in Scheme 2
Breaker Configuration (Breaker Monitor)
BK1TYP Breaker 1 Trip Type 3
BK2TYP Breaker 2 Trip Type 3
Breaker 1 Inputs (Breaker Monitor)
52AA1 N/O Contact Input—BK1 (SELOGIC Equation) IN101
Breaker 2 Inputs (Breaker Monitor)
52AA2 N/O Contact Input—BK2 (SELOGIC Equation) IN102
Relay Configuration (Group)
E79 Reclosing Y or Y1
Table 2.20 Two-Circuit-Breaker Single-Pole Reclose Initial Settings
Setting Description Entry
NUMBK Number of Breakers in Scheme 2
Breaker Configuration (Breaker Monitor)
BK1TYP Breaker 1 Trip Type 1
BK2TYP Breaker 2 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
Breaker 2 Inputs (Breaker Monitor)
52AA2 A-Phase N/O Contact Input—BK2 (SELOGIC Equation) IN104
52AB2 B-Phase N/O Contact Input—BK2 (SEL
OGIC Equation) IN105
52AC2 C-Phase N/O Contact Input—BK2 (SEL
OGIC Equation) IN106
Relay Configuration (Group)
E79 Reclosing Y or Y1
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