Sel SEL-421 - Circuit Breaker BK1 Modes of Operation; Circuit Breaker BK2 Modes of Operation

R.2.25
Date Code 20111215 Reference Manual SEL-421 Relay
Auto-Reclosing and Synchronism Check
Two-Circuit-Breaker Auto-Reclosing
E3PR1 is the SELOGIC control equation that enables three-pole auto-reclose
for Circuit Breaker BK1. You can assign this setting to a control input. ESPR1
is the SEL
OGIC control equation that enables single-pole auto-reclose for
Circuit Breaker BK1. You can assign this setting to a control input.
When ESPR1 equals logical 1, the relay can attempt a single-pole auto-reclose
cycle for Circuit Breaker BK1. If ESPR1 equals logical 0, the relay cannot
initiate a single-pole auto-reclose cycle for Circuit Breaker BK1.
When E3PR1 equals logical 1, the relay can attempt a three-pole auto-reclose
cycle for Circuit Breaker BK1. If E3PR1 equals logical 0, the relay goes to
lockout following a three-pole trip for Circuit Breaker BK1 and the
corresponding leader logic transfers automatically to Circuit Breaker BK2.
E3PR2 is the SEL
OGIC control equation that enables three-pole auto-reclose
for Circuit Breaker BK2. You can assign this setting to a control input. ESPR2
is the SEL
OGIC control equation that enables single-pole auto-reclose for
Circuit Breaker BK2. You can assign this setting to a control input.
When ESPR2 equals logical 1, the relay can attempt a single-pole auto-reclose
cycle for Circuit Breaker BK2. If ESPR2 equals logical 0, the relay cannot
initiate a single-pole auto-reclose cycle for Circuit Breaker BK2.
When E3PR2 equals logical 1, the relay can attempt a three-pole auto-reclose
cycle for Circuit Breaker BK2. If E3PR2 equals logical 0, the relay goes to
lockout following a three-pole trip for Circuit Breaker BK2.
Assert one or all SEL
OGIC control equations E3PR1, E3PR2, ESPR1, and
ESPR2 according to your reclosing requirements.
For single-pole reclosing, set ESPR1 := 1 and set NSPSHOT to the number of
single-pole reclose shots you want. For three-pole reclosing, set E3PR1 := 1
and set N3PSHOT for the number of three-pole shots you want. For both
single-pole and three-pole reclosing, set ESPR1 := 1, E3PR1 := 1, and
configure settings NSPSHOT and N3PSHOT for the number of reclose shots
of each type that you want (see Recloser Mode Enables on page R.2.9).
Table 2.21 Circuit Breaker BK1 Modes of Operation
E3PR1 ESPR1 Result
0 0 Auto-reclose disabled
0 1 Single-pole auto-reclose only enabled
1 0 Three-pole auto-reclose only enabled
1 1 Single- and three-pole auto-reclose enabled
Table 2.22 Circuit Breaker BK2 Modes of Operation
E3PR2 ESPR2 Result
0 0 Auto-reclose disabled
0 1 Single-pole auto-reclose only enabled
1 0 Three-pole auto-reclose only enabled
1 1 Single- and three-pole auto-reclose enabled