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Functions
6-204
If phase segregated auxiliary contacts of the circuit-breaker are connected, a three-
pole coupling by the 7SA6 is guaranteed when more than one CB pole is tripped. This
requires setting of the forced three pole coupling (see section 6.14.2 under subtitle
"Forced Three-pole Trip", page 207). An external automatic three-pole coupling is
therefore not necessary when the above conditions are satisfied. This rules out two-
pole tripping under all circumstances.
7SA6
internal
AR function
>AR Start
BI
>Trip L1 AR
BI
>Trip L2 AR
BI
>Trip L3 AR
BI
L–
Protective function
L+
AR Start
SO
SO
Trip L1*)
SO
Trip L2*)
SO
Trip L3*)
L+
Relay TRIP 1pL1
C
Relay TRIP 3ph.
Relay TRIP 1pL2
C
Relay TRIP 3ph.
Relay TRIP 1pL3
C
Relay TRIP 3ph.
BI
– binary input
SO – signal output
C
– commands
*)
– for all protective functions
operating with reclosure
Figure 6-111 Connection example for 2 protection devices with 2 automatic reclosure func-
tions
*)
L1 L2 L3
to the circuit-breaker
Second protection
2nd
automatic reclosure
AR Start
BI
Trip L1
BI
Trip L2
BI
Trip L3
BI
2nd protective relay
AR Start
SO
SO
Trip L1
SO
Trip L2
Trip L3 SO
C
Trip L1
C
Trip L2
C
Trip L3
7SA6 Manual
C53000-G1176-C156-2
L–
L+
L+
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