6.9
Date Code 20171006 Instruction Manual SEL-400 Series Relays
Autoreclosing
One-Circuit-Breaker Autoreclosing
E3PR1 is the SELOGIC control equation that enables three-pole autoreclose 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 autoreclose 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 autoreclose 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 autoreclose 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
and relay reclosing capabilities. For single-pole reclosing, set ESPR1 to evaluate
to logical 1 and set NSPSHOT to the desired number of single-pole reclose shots.
For three-pole reclosing, set E3PR1 to evaluate to logical 1 and set N3PSHOT for
the desired number of three-pole shots. 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 desired number of
reclose shots of each type (see Recloser Mode Enables on page 6.8).
Trip Logic and Reclose Sources for Single-Pole Breaker Applications
Internal Recloser
Program the recloser function to drive the trip logic with Relay Word bits R3PTE
(recloser three-pole trip enable) and R3PTE1 (recloser three-pole trip enable Cir-
cuit Breaker 1) as follows:
E3PT := R3PTE Three-Pole Trip Enable (SEL
OGIC equation)
E3PT1 := R3PTE1 Breaker 1 3PT (SEL
OGIC equation)
These settings connect the internal recloser for both three-pole reclosing and sin-
gle-pole reclosing. Enter enable settings ESPR1 and E3PR1 as appropriate for
your application.
Relay Word bits R3PTE and R3PTE1 are logical 1 for either of the following
conditions when the setting NUMBK (number of breakers in scheme) is logical 1
and SPLSHT (single-pole last shot) is asserted (see Figure 6.9):
➤ BK1TYP := 3 (Breaker 1 Trip Type)
➤ NSPSHOT := N (Number of Single-Pole Reclosures)
Table 6.4 One Circuit Breaker Modes of Operation
E3PR1 ESPR1
a
a
ESPR1 only applies to relays that support single-pole reclosing.
Result
0 0 Autoreclose disabled
0 1 Single-pole autoreclose only enabled
1 0 Three-pole autoreclose only enabled
1 1 Single- and three-pole autoreclose enabled
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