R.2.9
Date Code 20111215 Reference Manual SEL-421 Relay
Auto-Reclosing and Synchronism Check
One-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.
Recloser Mode
Enables
The SELOGIC control equations E3PR1 and ESPR1 set the SEL-421 for the
auto-reclose modes. Table 2.4 illustrates how to enable the auto-reclose modes
for Circuit Breaker 1.
E3PR1 is the SEL
OGIC control equation that enables three-pole auto-reclose
for Circuit Breaker 1. You can assign this setting to a control input. When
E3PR1 equals logical 1, the relay can attempt a three-pole auto-reclose cycle
for Circuit Breaker 1. If E3PR1 equals logical 0, the relay goes to lockout
following a three-pole trip for Circuit Breaker 1.
ESPR1 is the SEL
OGIC control equation that enables single-pole auto-reclose
for Circuit Breaker 1. 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 1. If ESPR1 equals logical 0, the relay cannot initiate a
single-pole auto-reclose cycle.
Set either or both E3PR1 and ESPR1 according to your reclosing
requirements. For single-pole reclosing, set ESPR1 to evaluate to logical 1 and
set NSPSHOT to the number of single-pole reclose shots you want. For three-
pole reclosing, set E3PR1 to evaluate to logical 1 and set N3PSHOT for the
number of three-pole shots you want. For both single-pole and three-pole
reclosing, set ESPR1 to evaluate to logical 1, set E3PR1 to evaluate to logical
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.
Trip Logic and
Reclose Sources
Internal Recloser
Program the SEL-421 recloser function to drive the trip logic with Relay Word
bits R3PTE (Recloser Three-Pole Trip Enable) and R3PTE1 (Recloser 3-pole
trip enable Circuit Breaker 1) as follows:
E3PT := R3PTE Three-Pole Trip Enable (SELOGIC Equation)
E3PT1 := R3PTE1 Breaker 1 3PT (SELOGIC Equation)
Relay Configuration (Group)
E79 Reclosing Y
Table 2.3 One-Circuit-Breaker Single-Pole Reclose Initial Settings
(Sheet 2 of 2)
Setting Description Entry
Table 2.4 One Circuit Breaker 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
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