P.4.26
SEL-411L Relay Protection Manual Date Code 20151029
Autoreclosing and Synchronism-Check
Two-Circuit-Breaker Autoreclosing
Enter enable settings ESPR1 and E3PR1 as appropriate for your application.
The relay is a single-pole tripping relay; that is, if E3PT is logical 0 and
E3PT1 equals logical 0, the relay can single-pole trip Circuit Breaker BK1. If
E3PT1 equals logical 1, the relay can only three-pole trip Circuit Breaker 1.
The same conditions apply to setting E3PT2 and Circuit Breaker BK2.
Table 4.23 summarizes the relay trip logic enable options.
Relay Word bits R3PTE1 and R3PTE2 both equal logical 1 for any of the
following conditions when Global setting NUMBK (Number of Breakers in
Scheme) is 2 and SPLSHT (Single-Pole Last Shot) is asserted (see
Figure 4.8).
➤ BK1TYP and BK2TYP equal 3 (Circuit Breaker 1 and Circuit
Breaker 2 Trip Type)
➤ NSPSHOT := N (Number of Single-Pole Reclosures)
External Recloser
If reclosing is performed by an external relay, assert SELOGIC control
equations E3PT, E3PT1, and E3PT2 via control inputs (for example):
E3PT := IN204 Three-Pole Trip Enable (SELOGIC Equation)
E3PT1 := IN205 Breaker 1 Three-Pole Trip (SELOGIC Equation)
E3PT2 := IN206 Breaker 2 Three-Pole Trip (SELOGIC Equation)
Connect the external recloser single-pole trip output signal to IN204, the
Circuit Breaker BK1 trip type signal to IN205, and the Circuit Breaker BK2
trip type signal to IN206. Other external recloser signals are required; consult
the external recloser documentation for interconnection with the relay.
In installations where the external reclosing relay does not provide three-phase
trip control signals, the TOP (Trip during Open-Pole) Relay Word bit can be
used in the E3PT setting (see Figure 3.166). This Relay Word bit will assert
just after a single- or two-pole trip, and remain asserted until the TOPD timer
expires. If a new trip occurs during this time, the E3PT := TOP setting would
then cause a three-pole trip.
Table 4.23 Trip Logic Enable Options
Enable Condition Circuit Breaker BK1 Circuit Breaker BK2
E3PT E3PT1 E3PT2
Single-
Pole Trip
Three-
Pole Trip
Single-
Pole Trip
Three-
Pole Trip
000x x
001x x
010 xx
011xx
100xx
101xx
110xx
111xx
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