6.26
SEL-400 Series Relays Instruction Manual Date Code 20171006
Autoreclosing
Autoreclose Logic Diagrams
External Recloser
If reclosing is performed by an external relay, assert SELOGIC control equations
E3PT, E3PT1, and E3PT2 via control inputs (for example):
E3PT := IN104 Three-Pole Trip Enable (SEL
OGIC Equation)
E3PT1 := IN105 Breaker 1 Three-Pole Trip (SEL
OGIC Equation)
E3PT2 := IN106 Breaker 2 Three-Pole Trip (SEL
OGIC Equation)
Connect the external recloser single-pole trip output signal to IN104, the Circuit
Breaker BK1 trip type signal to IN105, and the Circuit Breaker BK2 trip type sig-
nal to IN106. 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. 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.
Autoreclose Logic Diagrams
Figure 6.5 Circuit Breaker Pole-Open Logic Diagram—Single-Pole Relays
52AA1
52AB1
52AC1
SPOBK1
3POBK1
52AA1D
52AB1D
52AC1D
Timers in cycles
2POBK1
Note: Similar logic for Breaker 2
0
1.0
0
1.0
0
1.0
Relay
Word Bits
Relay
Word Bits
To Next Page
Loading...
