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2 Protection
Devices with 2
Automatic
Reclosure
Functions
7SA6 Manual
C53000-G1176-C156-2
If, on the other hand, the internal automatic reclosure function is controlled by the
pickup (only possible with three-pole tripping: 110 Trip mode = 3pole only ), the
phase-segregated fault detection (pickup) signals must be connected from the exter-
nal protection. The general trip command then suffices for tripping (F.No 2746 ). Fig-
ure 6-110 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 6-110 Connection example with external protection device for fault detection depen-
dent 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 6-111 shows the necessary cross-
connections.
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)
with PICKUP
7SA6
>Pickup L1 AR
>Pickup L2 AR
>Pickup L3 AR
>Trip for AR
AR 1.CycZoneR-
7SA6
>Pickup 1ph AR
>Pickup 2ph AR
>Pickup 3ph AR
>Trip for AR
AR 1.CycZoneRel
Functions
L–
L+
L–
L+
6-203
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