Siemens siprotec 7SA6 User Manual page 364

Functions
2 Protection
Devices with 2
Automatic
Reclosure
Functions
6-182
external protection. The general trip command then suffices for tripping (F.No ).
Figure 6-101 shows connection examples.
external
protection device
L+
L–
Starting signal for each phase
external
protection device
L+
L–
Starting signal 1-phase, 2-phase and 3-phase
Figure 6-101 Connection example with external protection device for fault detection
dependent dead time — dead time control by start signals of the protection
device;
AR control mode =
If redundant protection is provided for a line and each protection operates with its own
automatic reclosure function, a certain signal exchange between the two combinations
is necessary. The connection example in figure 6-102 shows the necessary cross-
connections.
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 6.12.2 under subtitle
Pick-up L1
Pick-up L2
Pick-up L3
Tripping
Release AR Stage
(if nec. for other AR)
Pick-up 1-phase
Pick-up 2-phase
Pick-up 3-phase
Tripping
Release AR Stage
(if nec. for other AR)
ZLWK 3,&.83
7SA6
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AR 1.CycZoneRel
7SA6
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C53000-G1176-C133-1
L–
L+
L–
L+
7SA6 Manual