Schweitzer Engineering Laboratories SEL-421-4 - Page 984

6.8
SEL-400 Series Relays Instruction Manual Date Code 20171006
Autoreclosing
One-Circuit-Breaker Autoreclosing
NBK1 equals logical 1 when Circuit Breaker 1 is closed and the autoreclose logic
is reset, or if the autoreclose logic is in an autoreclose cycle (79CY1 or 79CY3).
NBK0 equals logical 1 when Circuit Breaker 1 is open and not in an autoreclose
cycle (79CY1 or 79CY3), or if the autoreclose logic is locked out (BK1LO).
Enable Autoreclose Logic for One Circuit Breaker
Three-Pole Trip Circuit Breaker
The initial settings necessary to enable autoreclose for a single three-pole trip cir-
cuit breaker are shown in Table 6.2.
Single-Pole Trip Circuit Breaker
The initial settings necessary to enable autoreclose for one single-pole trip circuit
breaker are shown in Table 6.3 .
Recloser Mode Enables
The SELOGIC control equations E3PR1 and ESPR1 are used to set the relay auto-
reclose modes. Table 6.4 illustrates how to enable the autoreclose modes for Cir-
cuit Breaker 1.
Table 6.2 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
a
a
Only applies to relays that support single-pole breaker operations.
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 6.3 One-Circuit-Breaker Single-Pole Reclose 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 1
Breaker 1 Inputs (Breaker Monitor)
52AA1 A-Phase N/O Contact Input—BK1 (SEL
OGIC 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
Relay Configuration (Group)
E79 Reclosing Y